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9edeaea1bc
Introduce the basic infrastructure to have a core wide rq->lock. This relies on the rq->__lock order being in increasing CPU number (inside a core). It is also constrained to SMT8 per lockdep (and SMT256 per preempt_count). Luckily SMT8 is the max supported SMT count for Linux (Mips, Sparc and Power are known to have this). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Don Hiatt <dhiatt@digitalocean.com> Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com> Tested-by: Vincent Guittot <vincent.guittot@linaro.org> Link: https://lkml.kernel.org/r/YJUNfzSgptjX7tG6@hirez.programming.kicks-ass.net
2845 lines
73 KiB
C
2845 lines
73 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Scheduler internal types and methods:
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*/
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#include <linux/sched.h>
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#include <linux/sched/autogroup.h>
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#include <linux/sched/clock.h>
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#include <linux/sched/coredump.h>
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#include <linux/sched/cpufreq.h>
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#include <linux/sched/cputime.h>
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#include <linux/sched/deadline.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/hotplug.h>
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#include <linux/sched/idle.h>
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#include <linux/sched/init.h>
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#include <linux/sched/isolation.h>
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#include <linux/sched/jobctl.h>
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#include <linux/sched/loadavg.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/nohz.h>
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#include <linux/sched/numa_balancing.h>
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#include <linux/sched/prio.h>
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#include <linux/sched/rt.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/smt.h>
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#include <linux/sched/stat.h>
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#include <linux/sched/sysctl.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/sched/topology.h>
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#include <linux/sched/user.h>
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#include <linux/sched/wake_q.h>
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#include <linux/sched/xacct.h>
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#include <uapi/linux/sched/types.h>
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#include <linux/binfmts.h>
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#include <linux/bitops.h>
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#include <linux/blkdev.h>
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#include <linux/compat.h>
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#include <linux/context_tracking.h>
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#include <linux/cpufreq.h>
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#include <linux/cpuidle.h>
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#include <linux/cpuset.h>
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#include <linux/ctype.h>
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#include <linux/debugfs.h>
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#include <linux/delayacct.h>
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#include <linux/energy_model.h>
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#include <linux/init_task.h>
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#include <linux/kprobes.h>
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#include <linux/kthread.h>
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#include <linux/membarrier.h>
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#include <linux/migrate.h>
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#include <linux/mmu_context.h>
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#include <linux/nmi.h>
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#include <linux/proc_fs.h>
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#include <linux/prefetch.h>
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#include <linux/profile.h>
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#include <linux/psi.h>
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#include <linux/ratelimit.h>
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#include <linux/rcupdate_wait.h>
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#include <linux/security.h>
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#include <linux/stop_machine.h>
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#include <linux/suspend.h>
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#include <linux/swait.h>
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#include <linux/syscalls.h>
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#include <linux/task_work.h>
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#include <linux/tsacct_kern.h>
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#include <asm/tlb.h>
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#ifdef CONFIG_PARAVIRT
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# include <asm/paravirt.h>
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#endif
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#include "cpupri.h"
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#include "cpudeadline.h"
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#include <trace/events/sched.h>
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#ifdef CONFIG_SCHED_DEBUG
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# define SCHED_WARN_ON(x) WARN_ONCE(x, #x)
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#else
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# define SCHED_WARN_ON(x) ({ (void)(x), 0; })
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#endif
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struct rq;
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struct cpuidle_state;
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/* task_struct::on_rq states: */
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#define TASK_ON_RQ_QUEUED 1
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#define TASK_ON_RQ_MIGRATING 2
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extern __read_mostly int scheduler_running;
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extern unsigned long calc_load_update;
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extern atomic_long_t calc_load_tasks;
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extern void calc_global_load_tick(struct rq *this_rq);
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extern long calc_load_fold_active(struct rq *this_rq, long adjust);
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extern void call_trace_sched_update_nr_running(struct rq *rq, int count);
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/*
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* Helpers for converting nanosecond timing to jiffy resolution
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*/
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#define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ))
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/*
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* Increase resolution of nice-level calculations for 64-bit architectures.
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* The extra resolution improves shares distribution and load balancing of
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* low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup
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* hierarchies, especially on larger systems. This is not a user-visible change
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* and does not change the user-interface for setting shares/weights.
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*
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* We increase resolution only if we have enough bits to allow this increased
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* resolution (i.e. 64-bit). The costs for increasing resolution when 32-bit
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* are pretty high and the returns do not justify the increased costs.
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*
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* Really only required when CONFIG_FAIR_GROUP_SCHED=y is also set, but to
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* increase coverage and consistency always enable it on 64-bit platforms.
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*/
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#ifdef CONFIG_64BIT
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# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT + SCHED_FIXEDPOINT_SHIFT)
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# define scale_load(w) ((w) << SCHED_FIXEDPOINT_SHIFT)
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# define scale_load_down(w) \
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({ \
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unsigned long __w = (w); \
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if (__w) \
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__w = max(2UL, __w >> SCHED_FIXEDPOINT_SHIFT); \
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__w; \
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})
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#else
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# define NICE_0_LOAD_SHIFT (SCHED_FIXEDPOINT_SHIFT)
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# define scale_load(w) (w)
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# define scale_load_down(w) (w)
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#endif
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/*
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* Task weight (visible to users) and its load (invisible to users) have
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* independent resolution, but they should be well calibrated. We use
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* scale_load() and scale_load_down(w) to convert between them. The
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* following must be true:
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*
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* scale_load(sched_prio_to_weight[NICE_TO_PRIO(0)-MAX_RT_PRIO]) == NICE_0_LOAD
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*
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*/
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#define NICE_0_LOAD (1L << NICE_0_LOAD_SHIFT)
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/*
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* Single value that decides SCHED_DEADLINE internal math precision.
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* 10 -> just above 1us
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* 9 -> just above 0.5us
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*/
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#define DL_SCALE 10
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/*
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* Single value that denotes runtime == period, ie unlimited time.
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*/
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#define RUNTIME_INF ((u64)~0ULL)
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static inline int idle_policy(int policy)
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{
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return policy == SCHED_IDLE;
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}
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static inline int fair_policy(int policy)
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{
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return policy == SCHED_NORMAL || policy == SCHED_BATCH;
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}
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static inline int rt_policy(int policy)
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{
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return policy == SCHED_FIFO || policy == SCHED_RR;
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}
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static inline int dl_policy(int policy)
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{
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return policy == SCHED_DEADLINE;
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}
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static inline bool valid_policy(int policy)
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{
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return idle_policy(policy) || fair_policy(policy) ||
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rt_policy(policy) || dl_policy(policy);
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}
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static inline int task_has_idle_policy(struct task_struct *p)
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{
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return idle_policy(p->policy);
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}
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static inline int task_has_rt_policy(struct task_struct *p)
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{
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return rt_policy(p->policy);
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}
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static inline int task_has_dl_policy(struct task_struct *p)
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{
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return dl_policy(p->policy);
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}
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#define cap_scale(v, s) ((v)*(s) >> SCHED_CAPACITY_SHIFT)
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static inline void update_avg(u64 *avg, u64 sample)
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{
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s64 diff = sample - *avg;
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*avg += diff / 8;
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}
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/*
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* Shifting a value by an exponent greater *or equal* to the size of said value
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* is UB; cap at size-1.
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*/
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#define shr_bound(val, shift) \
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(val >> min_t(typeof(shift), shift, BITS_PER_TYPE(typeof(val)) - 1))
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/*
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* !! For sched_setattr_nocheck() (kernel) only !!
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*
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* This is actually gross. :(
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*
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* It is used to make schedutil kworker(s) higher priority than SCHED_DEADLINE
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* tasks, but still be able to sleep. We need this on platforms that cannot
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* atomically change clock frequency. Remove once fast switching will be
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* available on such platforms.
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*
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* SUGOV stands for SchedUtil GOVernor.
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*/
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#define SCHED_FLAG_SUGOV 0x10000000
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static inline bool dl_entity_is_special(struct sched_dl_entity *dl_se)
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{
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#ifdef CONFIG_CPU_FREQ_GOV_SCHEDUTIL
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return unlikely(dl_se->flags & SCHED_FLAG_SUGOV);
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#else
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return false;
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#endif
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}
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/*
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* Tells if entity @a should preempt entity @b.
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*/
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static inline bool
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dl_entity_preempt(struct sched_dl_entity *a, struct sched_dl_entity *b)
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{
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return dl_entity_is_special(a) ||
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dl_time_before(a->deadline, b->deadline);
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}
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/*
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* This is the priority-queue data structure of the RT scheduling class:
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*/
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struct rt_prio_array {
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DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */
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struct list_head queue[MAX_RT_PRIO];
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};
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struct rt_bandwidth {
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/* nests inside the rq lock: */
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raw_spinlock_t rt_runtime_lock;
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ktime_t rt_period;
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u64 rt_runtime;
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struct hrtimer rt_period_timer;
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unsigned int rt_period_active;
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};
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void __dl_clear_params(struct task_struct *p);
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struct dl_bandwidth {
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raw_spinlock_t dl_runtime_lock;
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u64 dl_runtime;
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u64 dl_period;
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};
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static inline int dl_bandwidth_enabled(void)
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{
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return sysctl_sched_rt_runtime >= 0;
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}
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/*
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* To keep the bandwidth of -deadline tasks under control
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* we need some place where:
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* - store the maximum -deadline bandwidth of each cpu;
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* - cache the fraction of bandwidth that is currently allocated in
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* each root domain;
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*
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* This is all done in the data structure below. It is similar to the
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* one used for RT-throttling (rt_bandwidth), with the main difference
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* that, since here we are only interested in admission control, we
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* do not decrease any runtime while the group "executes", neither we
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* need a timer to replenish it.
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*
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* With respect to SMP, bandwidth is given on a per root domain basis,
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* meaning that:
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* - bw (< 100%) is the deadline bandwidth of each CPU;
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* - total_bw is the currently allocated bandwidth in each root domain;
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*/
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struct dl_bw {
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raw_spinlock_t lock;
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u64 bw;
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u64 total_bw;
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};
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static inline void __dl_update(struct dl_bw *dl_b, s64 bw);
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static inline
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void __dl_sub(struct dl_bw *dl_b, u64 tsk_bw, int cpus)
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{
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dl_b->total_bw -= tsk_bw;
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__dl_update(dl_b, (s32)tsk_bw / cpus);
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}
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static inline
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void __dl_add(struct dl_bw *dl_b, u64 tsk_bw, int cpus)
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{
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dl_b->total_bw += tsk_bw;
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__dl_update(dl_b, -((s32)tsk_bw / cpus));
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}
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static inline bool __dl_overflow(struct dl_bw *dl_b, unsigned long cap,
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u64 old_bw, u64 new_bw)
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{
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return dl_b->bw != -1 &&
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cap_scale(dl_b->bw, cap) < dl_b->total_bw - old_bw + new_bw;
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}
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/*
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* Verify the fitness of task @p to run on @cpu taking into account the
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* CPU original capacity and the runtime/deadline ratio of the task.
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*
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* The function will return true if the CPU original capacity of the
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* @cpu scaled by SCHED_CAPACITY_SCALE >= runtime/deadline ratio of the
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* task and false otherwise.
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*/
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static inline bool dl_task_fits_capacity(struct task_struct *p, int cpu)
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{
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unsigned long cap = arch_scale_cpu_capacity(cpu);
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return cap_scale(p->dl.dl_deadline, cap) >= p->dl.dl_runtime;
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}
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extern void init_dl_bw(struct dl_bw *dl_b);
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extern int sched_dl_global_validate(void);
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extern void sched_dl_do_global(void);
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extern int sched_dl_overflow(struct task_struct *p, int policy, const struct sched_attr *attr);
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extern void __setparam_dl(struct task_struct *p, const struct sched_attr *attr);
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extern void __getparam_dl(struct task_struct *p, struct sched_attr *attr);
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extern bool __checkparam_dl(const struct sched_attr *attr);
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extern bool dl_param_changed(struct task_struct *p, const struct sched_attr *attr);
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extern int dl_task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed);
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extern int dl_cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial);
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extern bool dl_cpu_busy(unsigned int cpu);
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#ifdef CONFIG_CGROUP_SCHED
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#include <linux/cgroup.h>
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#include <linux/psi.h>
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struct cfs_rq;
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struct rt_rq;
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extern struct list_head task_groups;
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struct cfs_bandwidth {
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#ifdef CONFIG_CFS_BANDWIDTH
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raw_spinlock_t lock;
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ktime_t period;
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u64 quota;
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u64 runtime;
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s64 hierarchical_quota;
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u8 idle;
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u8 period_active;
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u8 slack_started;
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struct hrtimer period_timer;
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struct hrtimer slack_timer;
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struct list_head throttled_cfs_rq;
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/* Statistics: */
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int nr_periods;
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int nr_throttled;
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u64 throttled_time;
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#endif
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};
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/* Task group related information */
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struct task_group {
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struct cgroup_subsys_state css;
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#ifdef CONFIG_FAIR_GROUP_SCHED
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/* schedulable entities of this group on each CPU */
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struct sched_entity **se;
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/* runqueue "owned" by this group on each CPU */
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struct cfs_rq **cfs_rq;
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unsigned long shares;
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#ifdef CONFIG_SMP
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/*
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* load_avg can be heavily contended at clock tick time, so put
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* it in its own cacheline separated from the fields above which
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* will also be accessed at each tick.
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*/
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atomic_long_t load_avg ____cacheline_aligned;
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#endif
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#endif
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#ifdef CONFIG_RT_GROUP_SCHED
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struct sched_rt_entity **rt_se;
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struct rt_rq **rt_rq;
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struct rt_bandwidth rt_bandwidth;
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#endif
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struct rcu_head rcu;
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struct list_head list;
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struct task_group *parent;
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struct list_head siblings;
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struct list_head children;
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#ifdef CONFIG_SCHED_AUTOGROUP
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struct autogroup *autogroup;
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#endif
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struct cfs_bandwidth cfs_bandwidth;
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#ifdef CONFIG_UCLAMP_TASK_GROUP
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/* The two decimal precision [%] value requested from user-space */
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unsigned int uclamp_pct[UCLAMP_CNT];
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/* Clamp values requested for a task group */
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struct uclamp_se uclamp_req[UCLAMP_CNT];
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/* Effective clamp values used for a task group */
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struct uclamp_se uclamp[UCLAMP_CNT];
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#endif
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};
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#ifdef CONFIG_FAIR_GROUP_SCHED
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#define ROOT_TASK_GROUP_LOAD NICE_0_LOAD
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/*
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* A weight of 0 or 1 can cause arithmetics problems.
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* A weight of a cfs_rq is the sum of weights of which entities
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* are queued on this cfs_rq, so a weight of a entity should not be
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* too large, so as the shares value of a task group.
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* (The default weight is 1024 - so there's no practical
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* limitation from this.)
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*/
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#define MIN_SHARES (1UL << 1)
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#define MAX_SHARES (1UL << 18)
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#endif
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typedef int (*tg_visitor)(struct task_group *, void *);
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extern int walk_tg_tree_from(struct task_group *from,
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tg_visitor down, tg_visitor up, void *data);
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/*
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* Iterate the full tree, calling @down when first entering a node and @up when
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* leaving it for the final time.
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*
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* Caller must hold rcu_lock or sufficient equivalent.
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*/
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static inline int walk_tg_tree(tg_visitor down, tg_visitor up, void *data)
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{
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return walk_tg_tree_from(&root_task_group, down, up, data);
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}
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extern int tg_nop(struct task_group *tg, void *data);
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extern void free_fair_sched_group(struct task_group *tg);
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extern int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent);
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extern void online_fair_sched_group(struct task_group *tg);
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extern void unregister_fair_sched_group(struct task_group *tg);
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extern void init_tg_cfs_entry(struct task_group *tg, struct cfs_rq *cfs_rq,
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struct sched_entity *se, int cpu,
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struct sched_entity *parent);
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extern void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
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extern void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b);
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extern void start_cfs_bandwidth(struct cfs_bandwidth *cfs_b);
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extern void unthrottle_cfs_rq(struct cfs_rq *cfs_rq);
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extern void free_rt_sched_group(struct task_group *tg);
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|
extern int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent);
|
|
extern void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
|
|
struct sched_rt_entity *rt_se, int cpu,
|
|
struct sched_rt_entity *parent);
|
|
extern int sched_group_set_rt_runtime(struct task_group *tg, long rt_runtime_us);
|
|
extern int sched_group_set_rt_period(struct task_group *tg, u64 rt_period_us);
|
|
extern long sched_group_rt_runtime(struct task_group *tg);
|
|
extern long sched_group_rt_period(struct task_group *tg);
|
|
extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk);
|
|
|
|
extern struct task_group *sched_create_group(struct task_group *parent);
|
|
extern void sched_online_group(struct task_group *tg,
|
|
struct task_group *parent);
|
|
extern void sched_destroy_group(struct task_group *tg);
|
|
extern void sched_offline_group(struct task_group *tg);
|
|
|
|
extern void sched_move_task(struct task_struct *tsk);
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void set_task_rq_fair(struct sched_entity *se,
|
|
struct cfs_rq *prev, struct cfs_rq *next);
|
|
#else /* !CONFIG_SMP */
|
|
static inline void set_task_rq_fair(struct sched_entity *se,
|
|
struct cfs_rq *prev, struct cfs_rq *next) { }
|
|
#endif /* CONFIG_SMP */
|
|
#endif /* CONFIG_FAIR_GROUP_SCHED */
|
|
|
|
#else /* CONFIG_CGROUP_SCHED */
|
|
|
|
struct cfs_bandwidth { };
|
|
|
|
#endif /* CONFIG_CGROUP_SCHED */
|
|
|
|
/* CFS-related fields in a runqueue */
|
|
struct cfs_rq {
|
|
struct load_weight load;
|
|
unsigned int nr_running;
|
|
unsigned int h_nr_running; /* SCHED_{NORMAL,BATCH,IDLE} */
|
|
unsigned int idle_h_nr_running; /* SCHED_IDLE */
|
|
|
|
u64 exec_clock;
|
|
u64 min_vruntime;
|
|
#ifndef CONFIG_64BIT
|
|
u64 min_vruntime_copy;
|
|
#endif
|
|
|
|
struct rb_root_cached tasks_timeline;
|
|
|
|
/*
|
|
* 'curr' points to currently running entity on this cfs_rq.
|
|
* It is set to NULL otherwise (i.e when none are currently running).
|
|
*/
|
|
struct sched_entity *curr;
|
|
struct sched_entity *next;
|
|
struct sched_entity *last;
|
|
struct sched_entity *skip;
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
unsigned int nr_spread_over;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* CFS load tracking
|
|
*/
|
|
struct sched_avg avg;
|
|
#ifndef CONFIG_64BIT
|
|
u64 load_last_update_time_copy;
|
|
#endif
|
|
struct {
|
|
raw_spinlock_t lock ____cacheline_aligned;
|
|
int nr;
|
|
unsigned long load_avg;
|
|
unsigned long util_avg;
|
|
unsigned long runnable_avg;
|
|
} removed;
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
unsigned long tg_load_avg_contrib;
|
|
long propagate;
|
|
long prop_runnable_sum;
|
|
|
|
/*
|
|
* h_load = weight * f(tg)
|
|
*
|
|
* Where f(tg) is the recursive weight fraction assigned to
|
|
* this group.
|
|
*/
|
|
unsigned long h_load;
|
|
u64 last_h_load_update;
|
|
struct sched_entity *h_load_next;
|
|
#endif /* CONFIG_FAIR_GROUP_SCHED */
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
struct rq *rq; /* CPU runqueue to which this cfs_rq is attached */
|
|
|
|
/*
|
|
* leaf cfs_rqs are those that hold tasks (lowest schedulable entity in
|
|
* a hierarchy). Non-leaf lrqs hold other higher schedulable entities
|
|
* (like users, containers etc.)
|
|
*
|
|
* leaf_cfs_rq_list ties together list of leaf cfs_rq's in a CPU.
|
|
* This list is used during load balance.
|
|
*/
|
|
int on_list;
|
|
struct list_head leaf_cfs_rq_list;
|
|
struct task_group *tg; /* group that "owns" this runqueue */
|
|
|
|
#ifdef CONFIG_CFS_BANDWIDTH
|
|
int runtime_enabled;
|
|
s64 runtime_remaining;
|
|
|
|
u64 throttled_clock;
|
|
u64 throttled_clock_task;
|
|
u64 throttled_clock_task_time;
|
|
int throttled;
|
|
int throttle_count;
|
|
struct list_head throttled_list;
|
|
#endif /* CONFIG_CFS_BANDWIDTH */
|
|
#endif /* CONFIG_FAIR_GROUP_SCHED */
|
|
};
|
|
|
|
static inline int rt_bandwidth_enabled(void)
|
|
{
|
|
return sysctl_sched_rt_runtime >= 0;
|
|
}
|
|
|
|
/* RT IPI pull logic requires IRQ_WORK */
|
|
#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_SMP)
|
|
# define HAVE_RT_PUSH_IPI
|
|
#endif
|
|
|
|
/* Real-Time classes' related field in a runqueue: */
|
|
struct rt_rq {
|
|
struct rt_prio_array active;
|
|
unsigned int rt_nr_running;
|
|
unsigned int rr_nr_running;
|
|
#if defined CONFIG_SMP || defined CONFIG_RT_GROUP_SCHED
|
|
struct {
|
|
int curr; /* highest queued rt task prio */
|
|
#ifdef CONFIG_SMP
|
|
int next; /* next highest */
|
|
#endif
|
|
} highest_prio;
|
|
#endif
|
|
#ifdef CONFIG_SMP
|
|
unsigned long rt_nr_migratory;
|
|
unsigned long rt_nr_total;
|
|
int overloaded;
|
|
struct plist_head pushable_tasks;
|
|
|
|
#endif /* CONFIG_SMP */
|
|
int rt_queued;
|
|
|
|
int rt_throttled;
|
|
u64 rt_time;
|
|
u64 rt_runtime;
|
|
/* Nests inside the rq lock: */
|
|
raw_spinlock_t rt_runtime_lock;
|
|
|
|
#ifdef CONFIG_RT_GROUP_SCHED
|
|
unsigned long rt_nr_boosted;
|
|
|
|
struct rq *rq;
|
|
struct task_group *tg;
|
|
#endif
|
|
};
|
|
|
|
static inline bool rt_rq_is_runnable(struct rt_rq *rt_rq)
|
|
{
|
|
return rt_rq->rt_queued && rt_rq->rt_nr_running;
|
|
}
|
|
|
|
/* Deadline class' related fields in a runqueue */
|
|
struct dl_rq {
|
|
/* runqueue is an rbtree, ordered by deadline */
|
|
struct rb_root_cached root;
|
|
|
|
unsigned long dl_nr_running;
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Deadline values of the currently executing and the
|
|
* earliest ready task on this rq. Caching these facilitates
|
|
* the decision whether or not a ready but not running task
|
|
* should migrate somewhere else.
|
|
*/
|
|
struct {
|
|
u64 curr;
|
|
u64 next;
|
|
} earliest_dl;
|
|
|
|
unsigned long dl_nr_migratory;
|
|
int overloaded;
|
|
|
|
/*
|
|
* Tasks on this rq that can be pushed away. They are kept in
|
|
* an rb-tree, ordered by tasks' deadlines, with caching
|
|
* of the leftmost (earliest deadline) element.
|
|
*/
|
|
struct rb_root_cached pushable_dl_tasks_root;
|
|
#else
|
|
struct dl_bw dl_bw;
|
|
#endif
|
|
/*
|
|
* "Active utilization" for this runqueue: increased when a
|
|
* task wakes up (becomes TASK_RUNNING) and decreased when a
|
|
* task blocks
|
|
*/
|
|
u64 running_bw;
|
|
|
|
/*
|
|
* Utilization of the tasks "assigned" to this runqueue (including
|
|
* the tasks that are in runqueue and the tasks that executed on this
|
|
* CPU and blocked). Increased when a task moves to this runqueue, and
|
|
* decreased when the task moves away (migrates, changes scheduling
|
|
* policy, or terminates).
|
|
* This is needed to compute the "inactive utilization" for the
|
|
* runqueue (inactive utilization = this_bw - running_bw).
|
|
*/
|
|
u64 this_bw;
|
|
u64 extra_bw;
|
|
|
|
/*
|
|
* Inverse of the fraction of CPU utilization that can be reclaimed
|
|
* by the GRUB algorithm.
|
|
*/
|
|
u64 bw_ratio;
|
|
};
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
/* An entity is a task if it doesn't "own" a runqueue */
|
|
#define entity_is_task(se) (!se->my_q)
|
|
|
|
static inline void se_update_runnable(struct sched_entity *se)
|
|
{
|
|
if (!entity_is_task(se))
|
|
se->runnable_weight = se->my_q->h_nr_running;
|
|
}
|
|
|
|
static inline long se_runnable(struct sched_entity *se)
|
|
{
|
|
if (entity_is_task(se))
|
|
return !!se->on_rq;
|
|
else
|
|
return se->runnable_weight;
|
|
}
|
|
|
|
#else
|
|
#define entity_is_task(se) 1
|
|
|
|
static inline void se_update_runnable(struct sched_entity *se) {}
|
|
|
|
static inline long se_runnable(struct sched_entity *se)
|
|
{
|
|
return !!se->on_rq;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* XXX we want to get rid of these helpers and use the full load resolution.
|
|
*/
|
|
static inline long se_weight(struct sched_entity *se)
|
|
{
|
|
return scale_load_down(se->load.weight);
|
|
}
|
|
|
|
|
|
static inline bool sched_asym_prefer(int a, int b)
|
|
{
|
|
return arch_asym_cpu_priority(a) > arch_asym_cpu_priority(b);
|
|
}
|
|
|
|
struct perf_domain {
|
|
struct em_perf_domain *em_pd;
|
|
struct perf_domain *next;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
/* Scheduling group status flags */
|
|
#define SG_OVERLOAD 0x1 /* More than one runnable task on a CPU. */
|
|
#define SG_OVERUTILIZED 0x2 /* One or more CPUs are over-utilized. */
|
|
|
|
/*
|
|
* We add the notion of a root-domain which will be used to define per-domain
|
|
* variables. Each exclusive cpuset essentially defines an island domain by
|
|
* fully partitioning the member CPUs from any other cpuset. Whenever a new
|
|
* exclusive cpuset is created, we also create and attach a new root-domain
|
|
* object.
|
|
*
|
|
*/
|
|
struct root_domain {
|
|
atomic_t refcount;
|
|
atomic_t rto_count;
|
|
struct rcu_head rcu;
|
|
cpumask_var_t span;
|
|
cpumask_var_t online;
|
|
|
|
/*
|
|
* Indicate pullable load on at least one CPU, e.g:
|
|
* - More than one runnable task
|
|
* - Running task is misfit
|
|
*/
|
|
int overload;
|
|
|
|
/* Indicate one or more cpus over-utilized (tipping point) */
|
|
int overutilized;
|
|
|
|
/*
|
|
* The bit corresponding to a CPU gets set here if such CPU has more
|
|
* than one runnable -deadline task (as it is below for RT tasks).
|
|
*/
|
|
cpumask_var_t dlo_mask;
|
|
atomic_t dlo_count;
|
|
struct dl_bw dl_bw;
|
|
struct cpudl cpudl;
|
|
|
|
/*
|
|
* Indicate whether a root_domain's dl_bw has been checked or
|
|
* updated. It's monotonously increasing value.
|
|
*
|
|
* Also, some corner cases, like 'wrap around' is dangerous, but given
|
|
* that u64 is 'big enough'. So that shouldn't be a concern.
|
|
*/
|
|
u64 visit_gen;
|
|
|
|
#ifdef HAVE_RT_PUSH_IPI
|
|
/*
|
|
* For IPI pull requests, loop across the rto_mask.
|
|
*/
|
|
struct irq_work rto_push_work;
|
|
raw_spinlock_t rto_lock;
|
|
/* These are only updated and read within rto_lock */
|
|
int rto_loop;
|
|
int rto_cpu;
|
|
/* These atomics are updated outside of a lock */
|
|
atomic_t rto_loop_next;
|
|
atomic_t rto_loop_start;
|
|
#endif
|
|
/*
|
|
* The "RT overload" flag: it gets set if a CPU has more than
|
|
* one runnable RT task.
|
|
*/
|
|
cpumask_var_t rto_mask;
|
|
struct cpupri cpupri;
|
|
|
|
unsigned long max_cpu_capacity;
|
|
|
|
/*
|
|
* NULL-terminated list of performance domains intersecting with the
|
|
* CPUs of the rd. Protected by RCU.
|
|
*/
|
|
struct perf_domain __rcu *pd;
|
|
};
|
|
|
|
extern void init_defrootdomain(void);
|
|
extern int sched_init_domains(const struct cpumask *cpu_map);
|
|
extern void rq_attach_root(struct rq *rq, struct root_domain *rd);
|
|
extern void sched_get_rd(struct root_domain *rd);
|
|
extern void sched_put_rd(struct root_domain *rd);
|
|
|
|
#ifdef HAVE_RT_PUSH_IPI
|
|
extern void rto_push_irq_work_func(struct irq_work *work);
|
|
#endif
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#ifdef CONFIG_UCLAMP_TASK
|
|
/*
|
|
* struct uclamp_bucket - Utilization clamp bucket
|
|
* @value: utilization clamp value for tasks on this clamp bucket
|
|
* @tasks: number of RUNNABLE tasks on this clamp bucket
|
|
*
|
|
* Keep track of how many tasks are RUNNABLE for a given utilization
|
|
* clamp value.
|
|
*/
|
|
struct uclamp_bucket {
|
|
unsigned long value : bits_per(SCHED_CAPACITY_SCALE);
|
|
unsigned long tasks : BITS_PER_LONG - bits_per(SCHED_CAPACITY_SCALE);
|
|
};
|
|
|
|
/*
|
|
* struct uclamp_rq - rq's utilization clamp
|
|
* @value: currently active clamp values for a rq
|
|
* @bucket: utilization clamp buckets affecting a rq
|
|
*
|
|
* Keep track of RUNNABLE tasks on a rq to aggregate their clamp values.
|
|
* A clamp value is affecting a rq when there is at least one task RUNNABLE
|
|
* (or actually running) with that value.
|
|
*
|
|
* There are up to UCLAMP_CNT possible different clamp values, currently there
|
|
* are only two: minimum utilization and maximum utilization.
|
|
*
|
|
* All utilization clamping values are MAX aggregated, since:
|
|
* - for util_min: we want to run the CPU at least at the max of the minimum
|
|
* utilization required by its currently RUNNABLE tasks.
|
|
* - for util_max: we want to allow the CPU to run up to the max of the
|
|
* maximum utilization allowed by its currently RUNNABLE tasks.
|
|
*
|
|
* Since on each system we expect only a limited number of different
|
|
* utilization clamp values (UCLAMP_BUCKETS), use a simple array to track
|
|
* the metrics required to compute all the per-rq utilization clamp values.
|
|
*/
|
|
struct uclamp_rq {
|
|
unsigned int value;
|
|
struct uclamp_bucket bucket[UCLAMP_BUCKETS];
|
|
};
|
|
|
|
DECLARE_STATIC_KEY_FALSE(sched_uclamp_used);
|
|
#endif /* CONFIG_UCLAMP_TASK */
|
|
|
|
/*
|
|
* This is the main, per-CPU runqueue data structure.
|
|
*
|
|
* Locking rule: those places that want to lock multiple runqueues
|
|
* (such as the load balancing or the thread migration code), lock
|
|
* acquire operations must be ordered by ascending &runqueue.
|
|
*/
|
|
struct rq {
|
|
/* runqueue lock: */
|
|
raw_spinlock_t __lock;
|
|
|
|
/*
|
|
* nr_running and cpu_load should be in the same cacheline because
|
|
* remote CPUs use both these fields when doing load calculation.
|
|
*/
|
|
unsigned int nr_running;
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
unsigned int nr_numa_running;
|
|
unsigned int nr_preferred_running;
|
|
unsigned int numa_migrate_on;
|
|
#endif
|
|
#ifdef CONFIG_NO_HZ_COMMON
|
|
#ifdef CONFIG_SMP
|
|
unsigned long last_blocked_load_update_tick;
|
|
unsigned int has_blocked_load;
|
|
call_single_data_t nohz_csd;
|
|
#endif /* CONFIG_SMP */
|
|
unsigned int nohz_tick_stopped;
|
|
atomic_t nohz_flags;
|
|
#endif /* CONFIG_NO_HZ_COMMON */
|
|
|
|
#ifdef CONFIG_SMP
|
|
unsigned int ttwu_pending;
|
|
#endif
|
|
u64 nr_switches;
|
|
|
|
#ifdef CONFIG_UCLAMP_TASK
|
|
/* Utilization clamp values based on CPU's RUNNABLE tasks */
|
|
struct uclamp_rq uclamp[UCLAMP_CNT] ____cacheline_aligned;
|
|
unsigned int uclamp_flags;
|
|
#define UCLAMP_FLAG_IDLE 0x01
|
|
#endif
|
|
|
|
struct cfs_rq cfs;
|
|
struct rt_rq rt;
|
|
struct dl_rq dl;
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
/* list of leaf cfs_rq on this CPU: */
|
|
struct list_head leaf_cfs_rq_list;
|
|
struct list_head *tmp_alone_branch;
|
|
#endif /* CONFIG_FAIR_GROUP_SCHED */
|
|
|
|
/*
|
|
* This is part of a global counter where only the total sum
|
|
* over all CPUs matters. A task can increase this counter on
|
|
* one CPU and if it got migrated afterwards it may decrease
|
|
* it on another CPU. Always updated under the runqueue lock:
|
|
*/
|
|
unsigned long nr_uninterruptible;
|
|
|
|
struct task_struct __rcu *curr;
|
|
struct task_struct *idle;
|
|
struct task_struct *stop;
|
|
unsigned long next_balance;
|
|
struct mm_struct *prev_mm;
|
|
|
|
unsigned int clock_update_flags;
|
|
u64 clock;
|
|
/* Ensure that all clocks are in the same cache line */
|
|
u64 clock_task ____cacheline_aligned;
|
|
u64 clock_pelt;
|
|
unsigned long lost_idle_time;
|
|
|
|
atomic_t nr_iowait;
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
u64 last_seen_need_resched_ns;
|
|
int ticks_without_resched;
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMBARRIER
|
|
int membarrier_state;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
struct root_domain *rd;
|
|
struct sched_domain __rcu *sd;
|
|
|
|
unsigned long cpu_capacity;
|
|
unsigned long cpu_capacity_orig;
|
|
|
|
struct callback_head *balance_callback;
|
|
|
|
unsigned char nohz_idle_balance;
|
|
unsigned char idle_balance;
|
|
|
|
unsigned long misfit_task_load;
|
|
|
|
/* For active balancing */
|
|
int active_balance;
|
|
int push_cpu;
|
|
struct cpu_stop_work active_balance_work;
|
|
|
|
/* CPU of this runqueue: */
|
|
int cpu;
|
|
int online;
|
|
|
|
struct list_head cfs_tasks;
|
|
|
|
struct sched_avg avg_rt;
|
|
struct sched_avg avg_dl;
|
|
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
|
|
struct sched_avg avg_irq;
|
|
#endif
|
|
#ifdef CONFIG_SCHED_THERMAL_PRESSURE
|
|
struct sched_avg avg_thermal;
|
|
#endif
|
|
u64 idle_stamp;
|
|
u64 avg_idle;
|
|
|
|
/* This is used to determine avg_idle's max value */
|
|
u64 max_idle_balance_cost;
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
struct rcuwait hotplug_wait;
|
|
#endif
|
|
#endif /* CONFIG_SMP */
|
|
|
|
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
|
|
u64 prev_irq_time;
|
|
#endif
|
|
#ifdef CONFIG_PARAVIRT
|
|
u64 prev_steal_time;
|
|
#endif
|
|
#ifdef CONFIG_PARAVIRT_TIME_ACCOUNTING
|
|
u64 prev_steal_time_rq;
|
|
#endif
|
|
|
|
/* calc_load related fields */
|
|
unsigned long calc_load_update;
|
|
long calc_load_active;
|
|
|
|
#ifdef CONFIG_SCHED_HRTICK
|
|
#ifdef CONFIG_SMP
|
|
call_single_data_t hrtick_csd;
|
|
#endif
|
|
struct hrtimer hrtick_timer;
|
|
ktime_t hrtick_time;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SCHEDSTATS
|
|
/* latency stats */
|
|
struct sched_info rq_sched_info;
|
|
unsigned long long rq_cpu_time;
|
|
/* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
|
|
|
|
/* sys_sched_yield() stats */
|
|
unsigned int yld_count;
|
|
|
|
/* schedule() stats */
|
|
unsigned int sched_count;
|
|
unsigned int sched_goidle;
|
|
|
|
/* try_to_wake_up() stats */
|
|
unsigned int ttwu_count;
|
|
unsigned int ttwu_local;
|
|
#endif
|
|
|
|
#ifdef CONFIG_CPU_IDLE
|
|
/* Must be inspected within a rcu lock section */
|
|
struct cpuidle_state *idle_state;
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
unsigned int nr_pinned;
|
|
#endif
|
|
unsigned int push_busy;
|
|
struct cpu_stop_work push_work;
|
|
|
|
#ifdef CONFIG_SCHED_CORE
|
|
/* per rq */
|
|
struct rq *core;
|
|
unsigned int core_enabled;
|
|
#endif
|
|
};
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
|
|
/* CPU runqueue to which this cfs_rq is attached */
|
|
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
|
|
{
|
|
return cfs_rq->rq;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline struct rq *rq_of(struct cfs_rq *cfs_rq)
|
|
{
|
|
return container_of(cfs_rq, struct rq, cfs);
|
|
}
|
|
#endif
|
|
|
|
static inline int cpu_of(struct rq *rq)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
return rq->cpu;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
#define MDF_PUSH 0x01
|
|
|
|
static inline bool is_migration_disabled(struct task_struct *p)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
return p->migration_disabled;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_SCHED_CORE
|
|
|
|
DECLARE_STATIC_KEY_FALSE(__sched_core_enabled);
|
|
|
|
static inline bool sched_core_enabled(struct rq *rq)
|
|
{
|
|
return static_branch_unlikely(&__sched_core_enabled) && rq->core_enabled;
|
|
}
|
|
|
|
static inline bool sched_core_disabled(void)
|
|
{
|
|
return !static_branch_unlikely(&__sched_core_enabled);
|
|
}
|
|
|
|
static inline raw_spinlock_t *rq_lockp(struct rq *rq)
|
|
{
|
|
if (sched_core_enabled(rq))
|
|
return &rq->core->__lock;
|
|
|
|
return &rq->__lock;
|
|
}
|
|
|
|
#else /* !CONFIG_SCHED_CORE */
|
|
|
|
static inline bool sched_core_enabled(struct rq *rq)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool sched_core_disabled(void)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline raw_spinlock_t *rq_lockp(struct rq *rq)
|
|
{
|
|
return &rq->__lock;
|
|
}
|
|
|
|
#endif /* CONFIG_SCHED_CORE */
|
|
|
|
static inline void lockdep_assert_rq_held(struct rq *rq)
|
|
{
|
|
lockdep_assert_held(rq_lockp(rq));
|
|
}
|
|
|
|
extern void raw_spin_rq_lock_nested(struct rq *rq, int subclass);
|
|
extern bool raw_spin_rq_trylock(struct rq *rq);
|
|
extern void raw_spin_rq_unlock(struct rq *rq);
|
|
|
|
static inline void raw_spin_rq_lock(struct rq *rq)
|
|
{
|
|
raw_spin_rq_lock_nested(rq, 0);
|
|
}
|
|
|
|
static inline void raw_spin_rq_lock_irq(struct rq *rq)
|
|
{
|
|
local_irq_disable();
|
|
raw_spin_rq_lock(rq);
|
|
}
|
|
|
|
static inline void raw_spin_rq_unlock_irq(struct rq *rq)
|
|
{
|
|
raw_spin_rq_unlock(rq);
|
|
local_irq_enable();
|
|
}
|
|
|
|
static inline unsigned long _raw_spin_rq_lock_irqsave(struct rq *rq)
|
|
{
|
|
unsigned long flags;
|
|
local_irq_save(flags);
|
|
raw_spin_rq_lock(rq);
|
|
return flags;
|
|
}
|
|
|
|
static inline void raw_spin_rq_unlock_irqrestore(struct rq *rq, unsigned long flags)
|
|
{
|
|
raw_spin_rq_unlock(rq);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
#define raw_spin_rq_lock_irqsave(rq, flags) \
|
|
do { \
|
|
flags = _raw_spin_rq_lock_irqsave(rq); \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_SCHED_SMT
|
|
extern void __update_idle_core(struct rq *rq);
|
|
|
|
static inline void update_idle_core(struct rq *rq)
|
|
{
|
|
if (static_branch_unlikely(&sched_smt_present))
|
|
__update_idle_core(rq);
|
|
}
|
|
|
|
#else
|
|
static inline void update_idle_core(struct rq *rq) { }
|
|
#endif
|
|
|
|
DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
|
|
|
|
#define cpu_rq(cpu) (&per_cpu(runqueues, (cpu)))
|
|
#define this_rq() this_cpu_ptr(&runqueues)
|
|
#define task_rq(p) cpu_rq(task_cpu(p))
|
|
#define cpu_curr(cpu) (cpu_rq(cpu)->curr)
|
|
#define raw_rq() raw_cpu_ptr(&runqueues)
|
|
|
|
extern void update_rq_clock(struct rq *rq);
|
|
|
|
static inline u64 __rq_clock_broken(struct rq *rq)
|
|
{
|
|
return READ_ONCE(rq->clock);
|
|
}
|
|
|
|
/*
|
|
* rq::clock_update_flags bits
|
|
*
|
|
* %RQCF_REQ_SKIP - will request skipping of clock update on the next
|
|
* call to __schedule(). This is an optimisation to avoid
|
|
* neighbouring rq clock updates.
|
|
*
|
|
* %RQCF_ACT_SKIP - is set from inside of __schedule() when skipping is
|
|
* in effect and calls to update_rq_clock() are being ignored.
|
|
*
|
|
* %RQCF_UPDATED - is a debug flag that indicates whether a call has been
|
|
* made to update_rq_clock() since the last time rq::lock was pinned.
|
|
*
|
|
* If inside of __schedule(), clock_update_flags will have been
|
|
* shifted left (a left shift is a cheap operation for the fast path
|
|
* to promote %RQCF_REQ_SKIP to %RQCF_ACT_SKIP), so you must use,
|
|
*
|
|
* if (rq-clock_update_flags >= RQCF_UPDATED)
|
|
*
|
|
* to check if %RQCF_UPDATED is set. It'll never be shifted more than
|
|
* one position though, because the next rq_unpin_lock() will shift it
|
|
* back.
|
|
*/
|
|
#define RQCF_REQ_SKIP 0x01
|
|
#define RQCF_ACT_SKIP 0x02
|
|
#define RQCF_UPDATED 0x04
|
|
|
|
static inline void assert_clock_updated(struct rq *rq)
|
|
{
|
|
/*
|
|
* The only reason for not seeing a clock update since the
|
|
* last rq_pin_lock() is if we're currently skipping updates.
|
|
*/
|
|
SCHED_WARN_ON(rq->clock_update_flags < RQCF_ACT_SKIP);
|
|
}
|
|
|
|
static inline u64 rq_clock(struct rq *rq)
|
|
{
|
|
lockdep_assert_rq_held(rq);
|
|
assert_clock_updated(rq);
|
|
|
|
return rq->clock;
|
|
}
|
|
|
|
static inline u64 rq_clock_task(struct rq *rq)
|
|
{
|
|
lockdep_assert_rq_held(rq);
|
|
assert_clock_updated(rq);
|
|
|
|
return rq->clock_task;
|
|
}
|
|
|
|
/**
|
|
* By default the decay is the default pelt decay period.
|
|
* The decay shift can change the decay period in
|
|
* multiples of 32.
|
|
* Decay shift Decay period(ms)
|
|
* 0 32
|
|
* 1 64
|
|
* 2 128
|
|
* 3 256
|
|
* 4 512
|
|
*/
|
|
extern int sched_thermal_decay_shift;
|
|
|
|
static inline u64 rq_clock_thermal(struct rq *rq)
|
|
{
|
|
return rq_clock_task(rq) >> sched_thermal_decay_shift;
|
|
}
|
|
|
|
static inline void rq_clock_skip_update(struct rq *rq)
|
|
{
|
|
lockdep_assert_rq_held(rq);
|
|
rq->clock_update_flags |= RQCF_REQ_SKIP;
|
|
}
|
|
|
|
/*
|
|
* See rt task throttling, which is the only time a skip
|
|
* request is canceled.
|
|
*/
|
|
static inline void rq_clock_cancel_skipupdate(struct rq *rq)
|
|
{
|
|
lockdep_assert_rq_held(rq);
|
|
rq->clock_update_flags &= ~RQCF_REQ_SKIP;
|
|
}
|
|
|
|
struct rq_flags {
|
|
unsigned long flags;
|
|
struct pin_cookie cookie;
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
/*
|
|
* A copy of (rq::clock_update_flags & RQCF_UPDATED) for the
|
|
* current pin context is stashed here in case it needs to be
|
|
* restored in rq_repin_lock().
|
|
*/
|
|
unsigned int clock_update_flags;
|
|
#endif
|
|
};
|
|
|
|
extern struct callback_head balance_push_callback;
|
|
|
|
/*
|
|
* Lockdep annotation that avoids accidental unlocks; it's like a
|
|
* sticky/continuous lockdep_assert_held().
|
|
*
|
|
* This avoids code that has access to 'struct rq *rq' (basically everything in
|
|
* the scheduler) from accidentally unlocking the rq if they do not also have a
|
|
* copy of the (on-stack) 'struct rq_flags rf'.
|
|
*
|
|
* Also see Documentation/locking/lockdep-design.rst.
|
|
*/
|
|
static inline void rq_pin_lock(struct rq *rq, struct rq_flags *rf)
|
|
{
|
|
rf->cookie = lockdep_pin_lock(rq_lockp(rq));
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
rq->clock_update_flags &= (RQCF_REQ_SKIP|RQCF_ACT_SKIP);
|
|
rf->clock_update_flags = 0;
|
|
#ifdef CONFIG_SMP
|
|
SCHED_WARN_ON(rq->balance_callback && rq->balance_callback != &balance_push_callback);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
static inline void rq_unpin_lock(struct rq *rq, struct rq_flags *rf)
|
|
{
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
if (rq->clock_update_flags > RQCF_ACT_SKIP)
|
|
rf->clock_update_flags = RQCF_UPDATED;
|
|
#endif
|
|
|
|
lockdep_unpin_lock(rq_lockp(rq), rf->cookie);
|
|
}
|
|
|
|
static inline void rq_repin_lock(struct rq *rq, struct rq_flags *rf)
|
|
{
|
|
lockdep_repin_lock(rq_lockp(rq), rf->cookie);
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
/*
|
|
* Restore the value we stashed in @rf for this pin context.
|
|
*/
|
|
rq->clock_update_flags |= rf->clock_update_flags;
|
|
#endif
|
|
}
|
|
|
|
struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
|
|
__acquires(rq->lock);
|
|
|
|
struct rq *task_rq_lock(struct task_struct *p, struct rq_flags *rf)
|
|
__acquires(p->pi_lock)
|
|
__acquires(rq->lock);
|
|
|
|
static inline void __task_rq_unlock(struct rq *rq, struct rq_flags *rf)
|
|
__releases(rq->lock)
|
|
{
|
|
rq_unpin_lock(rq, rf);
|
|
raw_spin_rq_unlock(rq);
|
|
}
|
|
|
|
static inline void
|
|
task_rq_unlock(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
|
|
__releases(rq->lock)
|
|
__releases(p->pi_lock)
|
|
{
|
|
rq_unpin_lock(rq, rf);
|
|
raw_spin_rq_unlock(rq);
|
|
raw_spin_unlock_irqrestore(&p->pi_lock, rf->flags);
|
|
}
|
|
|
|
static inline void
|
|
rq_lock_irqsave(struct rq *rq, struct rq_flags *rf)
|
|
__acquires(rq->lock)
|
|
{
|
|
raw_spin_rq_lock_irqsave(rq, rf->flags);
|
|
rq_pin_lock(rq, rf);
|
|
}
|
|
|
|
static inline void
|
|
rq_lock_irq(struct rq *rq, struct rq_flags *rf)
|
|
__acquires(rq->lock)
|
|
{
|
|
raw_spin_rq_lock_irq(rq);
|
|
rq_pin_lock(rq, rf);
|
|
}
|
|
|
|
static inline void
|
|
rq_lock(struct rq *rq, struct rq_flags *rf)
|
|
__acquires(rq->lock)
|
|
{
|
|
raw_spin_rq_lock(rq);
|
|
rq_pin_lock(rq, rf);
|
|
}
|
|
|
|
static inline void
|
|
rq_relock(struct rq *rq, struct rq_flags *rf)
|
|
__acquires(rq->lock)
|
|
{
|
|
raw_spin_rq_lock(rq);
|
|
rq_repin_lock(rq, rf);
|
|
}
|
|
|
|
static inline void
|
|
rq_unlock_irqrestore(struct rq *rq, struct rq_flags *rf)
|
|
__releases(rq->lock)
|
|
{
|
|
rq_unpin_lock(rq, rf);
|
|
raw_spin_rq_unlock_irqrestore(rq, rf->flags);
|
|
}
|
|
|
|
static inline void
|
|
rq_unlock_irq(struct rq *rq, struct rq_flags *rf)
|
|
__releases(rq->lock)
|
|
{
|
|
rq_unpin_lock(rq, rf);
|
|
raw_spin_rq_unlock_irq(rq);
|
|
}
|
|
|
|
static inline void
|
|
rq_unlock(struct rq *rq, struct rq_flags *rf)
|
|
__releases(rq->lock)
|
|
{
|
|
rq_unpin_lock(rq, rf);
|
|
raw_spin_rq_unlock(rq);
|
|
}
|
|
|
|
static inline struct rq *
|
|
this_rq_lock_irq(struct rq_flags *rf)
|
|
__acquires(rq->lock)
|
|
{
|
|
struct rq *rq;
|
|
|
|
local_irq_disable();
|
|
rq = this_rq();
|
|
rq_lock(rq, rf);
|
|
return rq;
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
enum numa_topology_type {
|
|
NUMA_DIRECT,
|
|
NUMA_GLUELESS_MESH,
|
|
NUMA_BACKPLANE,
|
|
};
|
|
extern enum numa_topology_type sched_numa_topology_type;
|
|
extern int sched_max_numa_distance;
|
|
extern bool find_numa_distance(int distance);
|
|
extern void sched_init_numa(void);
|
|
extern void sched_domains_numa_masks_set(unsigned int cpu);
|
|
extern void sched_domains_numa_masks_clear(unsigned int cpu);
|
|
extern int sched_numa_find_closest(const struct cpumask *cpus, int cpu);
|
|
#else
|
|
static inline void sched_init_numa(void) { }
|
|
static inline void sched_domains_numa_masks_set(unsigned int cpu) { }
|
|
static inline void sched_domains_numa_masks_clear(unsigned int cpu) { }
|
|
static inline int sched_numa_find_closest(const struct cpumask *cpus, int cpu)
|
|
{
|
|
return nr_cpu_ids;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
/* The regions in numa_faults array from task_struct */
|
|
enum numa_faults_stats {
|
|
NUMA_MEM = 0,
|
|
NUMA_CPU,
|
|
NUMA_MEMBUF,
|
|
NUMA_CPUBUF
|
|
};
|
|
extern void sched_setnuma(struct task_struct *p, int node);
|
|
extern int migrate_task_to(struct task_struct *p, int cpu);
|
|
extern int migrate_swap(struct task_struct *p, struct task_struct *t,
|
|
int cpu, int scpu);
|
|
extern void init_numa_balancing(unsigned long clone_flags, struct task_struct *p);
|
|
#else
|
|
static inline void
|
|
init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
|
|
{
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static inline void
|
|
queue_balance_callback(struct rq *rq,
|
|
struct callback_head *head,
|
|
void (*func)(struct rq *rq))
|
|
{
|
|
lockdep_assert_rq_held(rq);
|
|
|
|
if (unlikely(head->next || rq->balance_callback == &balance_push_callback))
|
|
return;
|
|
|
|
head->func = (void (*)(struct callback_head *))func;
|
|
head->next = rq->balance_callback;
|
|
rq->balance_callback = head;
|
|
}
|
|
|
|
#define rcu_dereference_check_sched_domain(p) \
|
|
rcu_dereference_check((p), \
|
|
lockdep_is_held(&sched_domains_mutex))
|
|
|
|
/*
|
|
* The domain tree (rq->sd) is protected by RCU's quiescent state transition.
|
|
* See destroy_sched_domains: call_rcu for details.
|
|
*
|
|
* The domain tree of any CPU may only be accessed from within
|
|
* preempt-disabled sections.
|
|
*/
|
|
#define for_each_domain(cpu, __sd) \
|
|
for (__sd = rcu_dereference_check_sched_domain(cpu_rq(cpu)->sd); \
|
|
__sd; __sd = __sd->parent)
|
|
|
|
/**
|
|
* highest_flag_domain - Return highest sched_domain containing flag.
|
|
* @cpu: The CPU whose highest level of sched domain is to
|
|
* be returned.
|
|
* @flag: The flag to check for the highest sched_domain
|
|
* for the given CPU.
|
|
*
|
|
* Returns the highest sched_domain of a CPU which contains the given flag.
|
|
*/
|
|
static inline struct sched_domain *highest_flag_domain(int cpu, int flag)
|
|
{
|
|
struct sched_domain *sd, *hsd = NULL;
|
|
|
|
for_each_domain(cpu, sd) {
|
|
if (!(sd->flags & flag))
|
|
break;
|
|
hsd = sd;
|
|
}
|
|
|
|
return hsd;
|
|
}
|
|
|
|
static inline struct sched_domain *lowest_flag_domain(int cpu, int flag)
|
|
{
|
|
struct sched_domain *sd;
|
|
|
|
for_each_domain(cpu, sd) {
|
|
if (sd->flags & flag)
|
|
break;
|
|
}
|
|
|
|
return sd;
|
|
}
|
|
|
|
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_llc);
|
|
DECLARE_PER_CPU(int, sd_llc_size);
|
|
DECLARE_PER_CPU(int, sd_llc_id);
|
|
DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared);
|
|
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_numa);
|
|
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing);
|
|
DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_cpucapacity);
|
|
extern struct static_key_false sched_asym_cpucapacity;
|
|
|
|
struct sched_group_capacity {
|
|
atomic_t ref;
|
|
/*
|
|
* CPU capacity of this group, SCHED_CAPACITY_SCALE being max capacity
|
|
* for a single CPU.
|
|
*/
|
|
unsigned long capacity;
|
|
unsigned long min_capacity; /* Min per-CPU capacity in group */
|
|
unsigned long max_capacity; /* Max per-CPU capacity in group */
|
|
unsigned long next_update;
|
|
int imbalance; /* XXX unrelated to capacity but shared group state */
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
int id;
|
|
#endif
|
|
|
|
unsigned long cpumask[]; /* Balance mask */
|
|
};
|
|
|
|
struct sched_group {
|
|
struct sched_group *next; /* Must be a circular list */
|
|
atomic_t ref;
|
|
|
|
unsigned int group_weight;
|
|
struct sched_group_capacity *sgc;
|
|
int asym_prefer_cpu; /* CPU of highest priority in group */
|
|
|
|
/*
|
|
* The CPUs this group covers.
|
|
*
|
|
* NOTE: this field is variable length. (Allocated dynamically
|
|
* by attaching extra space to the end of the structure,
|
|
* depending on how many CPUs the kernel has booted up with)
|
|
*/
|
|
unsigned long cpumask[];
|
|
};
|
|
|
|
static inline struct cpumask *sched_group_span(struct sched_group *sg)
|
|
{
|
|
return to_cpumask(sg->cpumask);
|
|
}
|
|
|
|
/*
|
|
* See build_balance_mask().
|
|
*/
|
|
static inline struct cpumask *group_balance_mask(struct sched_group *sg)
|
|
{
|
|
return to_cpumask(sg->sgc->cpumask);
|
|
}
|
|
|
|
/**
|
|
* group_first_cpu - Returns the first CPU in the cpumask of a sched_group.
|
|
* @group: The group whose first CPU is to be returned.
|
|
*/
|
|
static inline unsigned int group_first_cpu(struct sched_group *group)
|
|
{
|
|
return cpumask_first(sched_group_span(group));
|
|
}
|
|
|
|
extern int group_balance_cpu(struct sched_group *sg);
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
void update_sched_domain_debugfs(void);
|
|
void dirty_sched_domain_sysctl(int cpu);
|
|
#else
|
|
static inline void update_sched_domain_debugfs(void)
|
|
{
|
|
}
|
|
static inline void dirty_sched_domain_sysctl(int cpu)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
extern int sched_update_scaling(void);
|
|
|
|
extern void flush_smp_call_function_from_idle(void);
|
|
|
|
#else /* !CONFIG_SMP: */
|
|
static inline void flush_smp_call_function_from_idle(void) { }
|
|
#endif
|
|
|
|
#include "stats.h"
|
|
#include "autogroup.h"
|
|
|
|
#ifdef CONFIG_CGROUP_SCHED
|
|
|
|
/*
|
|
* Return the group to which this tasks belongs.
|
|
*
|
|
* We cannot use task_css() and friends because the cgroup subsystem
|
|
* changes that value before the cgroup_subsys::attach() method is called,
|
|
* therefore we cannot pin it and might observe the wrong value.
|
|
*
|
|
* The same is true for autogroup's p->signal->autogroup->tg, the autogroup
|
|
* core changes this before calling sched_move_task().
|
|
*
|
|
* Instead we use a 'copy' which is updated from sched_move_task() while
|
|
* holding both task_struct::pi_lock and rq::lock.
|
|
*/
|
|
static inline struct task_group *task_group(struct task_struct *p)
|
|
{
|
|
return p->sched_task_group;
|
|
}
|
|
|
|
/* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */
|
|
static inline void set_task_rq(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED)
|
|
struct task_group *tg = task_group(p);
|
|
#endif
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
set_task_rq_fair(&p->se, p->se.cfs_rq, tg->cfs_rq[cpu]);
|
|
p->se.cfs_rq = tg->cfs_rq[cpu];
|
|
p->se.parent = tg->se[cpu];
|
|
#endif
|
|
|
|
#ifdef CONFIG_RT_GROUP_SCHED
|
|
p->rt.rt_rq = tg->rt_rq[cpu];
|
|
p->rt.parent = tg->rt_se[cpu];
|
|
#endif
|
|
}
|
|
|
|
#else /* CONFIG_CGROUP_SCHED */
|
|
|
|
static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { }
|
|
static inline struct task_group *task_group(struct task_struct *p)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
#endif /* CONFIG_CGROUP_SCHED */
|
|
|
|
static inline void __set_task_cpu(struct task_struct *p, unsigned int cpu)
|
|
{
|
|
set_task_rq(p, cpu);
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* After ->cpu is set up to a new value, task_rq_lock(p, ...) can be
|
|
* successfully executed on another CPU. We must ensure that updates of
|
|
* per-task data have been completed by this moment.
|
|
*/
|
|
smp_wmb();
|
|
#ifdef CONFIG_THREAD_INFO_IN_TASK
|
|
WRITE_ONCE(p->cpu, cpu);
|
|
#else
|
|
WRITE_ONCE(task_thread_info(p)->cpu, cpu);
|
|
#endif
|
|
p->wake_cpu = cpu;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Tunables that become constants when CONFIG_SCHED_DEBUG is off:
|
|
*/
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
# include <linux/static_key.h>
|
|
# define const_debug __read_mostly
|
|
#else
|
|
# define const_debug const
|
|
#endif
|
|
|
|
#define SCHED_FEAT(name, enabled) \
|
|
__SCHED_FEAT_##name ,
|
|
|
|
enum {
|
|
#include "features.h"
|
|
__SCHED_FEAT_NR,
|
|
};
|
|
|
|
#undef SCHED_FEAT
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
|
|
/*
|
|
* To support run-time toggling of sched features, all the translation units
|
|
* (but core.c) reference the sysctl_sched_features defined in core.c.
|
|
*/
|
|
extern const_debug unsigned int sysctl_sched_features;
|
|
|
|
#ifdef CONFIG_JUMP_LABEL
|
|
#define SCHED_FEAT(name, enabled) \
|
|
static __always_inline bool static_branch_##name(struct static_key *key) \
|
|
{ \
|
|
return static_key_##enabled(key); \
|
|
}
|
|
|
|
#include "features.h"
|
|
#undef SCHED_FEAT
|
|
|
|
extern struct static_key sched_feat_keys[__SCHED_FEAT_NR];
|
|
#define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
|
|
|
|
#else /* !CONFIG_JUMP_LABEL */
|
|
|
|
#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
|
|
|
|
#endif /* CONFIG_JUMP_LABEL */
|
|
|
|
#else /* !SCHED_DEBUG */
|
|
|
|
/*
|
|
* Each translation unit has its own copy of sysctl_sched_features to allow
|
|
* constants propagation at compile time and compiler optimization based on
|
|
* features default.
|
|
*/
|
|
#define SCHED_FEAT(name, enabled) \
|
|
(1UL << __SCHED_FEAT_##name) * enabled |
|
|
static const_debug __maybe_unused unsigned int sysctl_sched_features =
|
|
#include "features.h"
|
|
0;
|
|
#undef SCHED_FEAT
|
|
|
|
#define sched_feat(x) !!(sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
|
|
|
|
#endif /* SCHED_DEBUG */
|
|
|
|
extern struct static_key_false sched_numa_balancing;
|
|
extern struct static_key_false sched_schedstats;
|
|
|
|
static inline u64 global_rt_period(void)
|
|
{
|
|
return (u64)sysctl_sched_rt_period * NSEC_PER_USEC;
|
|
}
|
|
|
|
static inline u64 global_rt_runtime(void)
|
|
{
|
|
if (sysctl_sched_rt_runtime < 0)
|
|
return RUNTIME_INF;
|
|
|
|
return (u64)sysctl_sched_rt_runtime * NSEC_PER_USEC;
|
|
}
|
|
|
|
static inline int task_current(struct rq *rq, struct task_struct *p)
|
|
{
|
|
return rq->curr == p;
|
|
}
|
|
|
|
static inline int task_running(struct rq *rq, struct task_struct *p)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
return p->on_cpu;
|
|
#else
|
|
return task_current(rq, p);
|
|
#endif
|
|
}
|
|
|
|
static inline int task_on_rq_queued(struct task_struct *p)
|
|
{
|
|
return p->on_rq == TASK_ON_RQ_QUEUED;
|
|
}
|
|
|
|
static inline int task_on_rq_migrating(struct task_struct *p)
|
|
{
|
|
return READ_ONCE(p->on_rq) == TASK_ON_RQ_MIGRATING;
|
|
}
|
|
|
|
/* Wake flags. The first three directly map to some SD flag value */
|
|
#define WF_EXEC 0x02 /* Wakeup after exec; maps to SD_BALANCE_EXEC */
|
|
#define WF_FORK 0x04 /* Wakeup after fork; maps to SD_BALANCE_FORK */
|
|
#define WF_TTWU 0x08 /* Wakeup; maps to SD_BALANCE_WAKE */
|
|
|
|
#define WF_SYNC 0x10 /* Waker goes to sleep after wakeup */
|
|
#define WF_MIGRATED 0x20 /* Internal use, task got migrated */
|
|
#define WF_ON_CPU 0x40 /* Wakee is on_cpu */
|
|
|
|
#ifdef CONFIG_SMP
|
|
static_assert(WF_EXEC == SD_BALANCE_EXEC);
|
|
static_assert(WF_FORK == SD_BALANCE_FORK);
|
|
static_assert(WF_TTWU == SD_BALANCE_WAKE);
|
|
#endif
|
|
|
|
/*
|
|
* To aid in avoiding the subversion of "niceness" due to uneven distribution
|
|
* of tasks with abnormal "nice" values across CPUs the contribution that
|
|
* each task makes to its run queue's load is weighted according to its
|
|
* scheduling class and "nice" value. For SCHED_NORMAL tasks this is just a
|
|
* scaled version of the new time slice allocation that they receive on time
|
|
* slice expiry etc.
|
|
*/
|
|
|
|
#define WEIGHT_IDLEPRIO 3
|
|
#define WMULT_IDLEPRIO 1431655765
|
|
|
|
extern const int sched_prio_to_weight[40];
|
|
extern const u32 sched_prio_to_wmult[40];
|
|
|
|
/*
|
|
* {de,en}queue flags:
|
|
*
|
|
* DEQUEUE_SLEEP - task is no longer runnable
|
|
* ENQUEUE_WAKEUP - task just became runnable
|
|
*
|
|
* SAVE/RESTORE - an otherwise spurious dequeue/enqueue, done to ensure tasks
|
|
* are in a known state which allows modification. Such pairs
|
|
* should preserve as much state as possible.
|
|
*
|
|
* MOVE - paired with SAVE/RESTORE, explicitly does not preserve the location
|
|
* in the runqueue.
|
|
*
|
|
* ENQUEUE_HEAD - place at front of runqueue (tail if not specified)
|
|
* ENQUEUE_REPLENISH - CBS (replenish runtime and postpone deadline)
|
|
* ENQUEUE_MIGRATED - the task was migrated during wakeup
|
|
*
|
|
*/
|
|
|
|
#define DEQUEUE_SLEEP 0x01
|
|
#define DEQUEUE_SAVE 0x02 /* Matches ENQUEUE_RESTORE */
|
|
#define DEQUEUE_MOVE 0x04 /* Matches ENQUEUE_MOVE */
|
|
#define DEQUEUE_NOCLOCK 0x08 /* Matches ENQUEUE_NOCLOCK */
|
|
|
|
#define ENQUEUE_WAKEUP 0x01
|
|
#define ENQUEUE_RESTORE 0x02
|
|
#define ENQUEUE_MOVE 0x04
|
|
#define ENQUEUE_NOCLOCK 0x08
|
|
|
|
#define ENQUEUE_HEAD 0x10
|
|
#define ENQUEUE_REPLENISH 0x20
|
|
#ifdef CONFIG_SMP
|
|
#define ENQUEUE_MIGRATED 0x40
|
|
#else
|
|
#define ENQUEUE_MIGRATED 0x00
|
|
#endif
|
|
|
|
#define RETRY_TASK ((void *)-1UL)
|
|
|
|
struct sched_class {
|
|
|
|
#ifdef CONFIG_UCLAMP_TASK
|
|
int uclamp_enabled;
|
|
#endif
|
|
|
|
void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags);
|
|
void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags);
|
|
void (*yield_task) (struct rq *rq);
|
|
bool (*yield_to_task)(struct rq *rq, struct task_struct *p);
|
|
|
|
void (*check_preempt_curr)(struct rq *rq, struct task_struct *p, int flags);
|
|
|
|
struct task_struct *(*pick_next_task)(struct rq *rq);
|
|
|
|
void (*put_prev_task)(struct rq *rq, struct task_struct *p);
|
|
void (*set_next_task)(struct rq *rq, struct task_struct *p, bool first);
|
|
|
|
#ifdef CONFIG_SMP
|
|
int (*balance)(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
|
|
int (*select_task_rq)(struct task_struct *p, int task_cpu, int flags);
|
|
void (*migrate_task_rq)(struct task_struct *p, int new_cpu);
|
|
|
|
void (*task_woken)(struct rq *this_rq, struct task_struct *task);
|
|
|
|
void (*set_cpus_allowed)(struct task_struct *p,
|
|
const struct cpumask *newmask,
|
|
u32 flags);
|
|
|
|
void (*rq_online)(struct rq *rq);
|
|
void (*rq_offline)(struct rq *rq);
|
|
|
|
struct rq *(*find_lock_rq)(struct task_struct *p, struct rq *rq);
|
|
#endif
|
|
|
|
void (*task_tick)(struct rq *rq, struct task_struct *p, int queued);
|
|
void (*task_fork)(struct task_struct *p);
|
|
void (*task_dead)(struct task_struct *p);
|
|
|
|
/*
|
|
* The switched_from() call is allowed to drop rq->lock, therefore we
|
|
* cannot assume the switched_from/switched_to pair is serialized by
|
|
* rq->lock. They are however serialized by p->pi_lock.
|
|
*/
|
|
void (*switched_from)(struct rq *this_rq, struct task_struct *task);
|
|
void (*switched_to) (struct rq *this_rq, struct task_struct *task);
|
|
void (*prio_changed) (struct rq *this_rq, struct task_struct *task,
|
|
int oldprio);
|
|
|
|
unsigned int (*get_rr_interval)(struct rq *rq,
|
|
struct task_struct *task);
|
|
|
|
void (*update_curr)(struct rq *rq);
|
|
|
|
#define TASK_SET_GROUP 0
|
|
#define TASK_MOVE_GROUP 1
|
|
|
|
#ifdef CONFIG_FAIR_GROUP_SCHED
|
|
void (*task_change_group)(struct task_struct *p, int type);
|
|
#endif
|
|
};
|
|
|
|
static inline void put_prev_task(struct rq *rq, struct task_struct *prev)
|
|
{
|
|
WARN_ON_ONCE(rq->curr != prev);
|
|
prev->sched_class->put_prev_task(rq, prev);
|
|
}
|
|
|
|
static inline void set_next_task(struct rq *rq, struct task_struct *next)
|
|
{
|
|
WARN_ON_ONCE(rq->curr != next);
|
|
next->sched_class->set_next_task(rq, next, false);
|
|
}
|
|
|
|
|
|
/*
|
|
* Helper to define a sched_class instance; each one is placed in a separate
|
|
* section which is ordered by the linker script:
|
|
*
|
|
* include/asm-generic/vmlinux.lds.h
|
|
*
|
|
* Also enforce alignment on the instance, not the type, to guarantee layout.
|
|
*/
|
|
#define DEFINE_SCHED_CLASS(name) \
|
|
const struct sched_class name##_sched_class \
|
|
__aligned(__alignof__(struct sched_class)) \
|
|
__section("__" #name "_sched_class")
|
|
|
|
/* Defined in include/asm-generic/vmlinux.lds.h */
|
|
extern struct sched_class __begin_sched_classes[];
|
|
extern struct sched_class __end_sched_classes[];
|
|
|
|
#define sched_class_highest (__end_sched_classes - 1)
|
|
#define sched_class_lowest (__begin_sched_classes - 1)
|
|
|
|
#define for_class_range(class, _from, _to) \
|
|
for (class = (_from); class != (_to); class--)
|
|
|
|
#define for_each_class(class) \
|
|
for_class_range(class, sched_class_highest, sched_class_lowest)
|
|
|
|
extern const struct sched_class stop_sched_class;
|
|
extern const struct sched_class dl_sched_class;
|
|
extern const struct sched_class rt_sched_class;
|
|
extern const struct sched_class fair_sched_class;
|
|
extern const struct sched_class idle_sched_class;
|
|
|
|
static inline bool sched_stop_runnable(struct rq *rq)
|
|
{
|
|
return rq->stop && task_on_rq_queued(rq->stop);
|
|
}
|
|
|
|
static inline bool sched_dl_runnable(struct rq *rq)
|
|
{
|
|
return rq->dl.dl_nr_running > 0;
|
|
}
|
|
|
|
static inline bool sched_rt_runnable(struct rq *rq)
|
|
{
|
|
return rq->rt.rt_queued > 0;
|
|
}
|
|
|
|
static inline bool sched_fair_runnable(struct rq *rq)
|
|
{
|
|
return rq->cfs.nr_running > 0;
|
|
}
|
|
|
|
extern struct task_struct *pick_next_task_fair(struct rq *rq, struct task_struct *prev, struct rq_flags *rf);
|
|
extern struct task_struct *pick_next_task_idle(struct rq *rq);
|
|
|
|
#define SCA_CHECK 0x01
|
|
#define SCA_MIGRATE_DISABLE 0x02
|
|
#define SCA_MIGRATE_ENABLE 0x04
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
extern void update_group_capacity(struct sched_domain *sd, int cpu);
|
|
|
|
extern void trigger_load_balance(struct rq *rq);
|
|
|
|
extern void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask, u32 flags);
|
|
|
|
static inline struct task_struct *get_push_task(struct rq *rq)
|
|
{
|
|
struct task_struct *p = rq->curr;
|
|
|
|
lockdep_assert_rq_held(rq);
|
|
|
|
if (rq->push_busy)
|
|
return NULL;
|
|
|
|
if (p->nr_cpus_allowed == 1)
|
|
return NULL;
|
|
|
|
rq->push_busy = true;
|
|
return get_task_struct(p);
|
|
}
|
|
|
|
extern int push_cpu_stop(void *arg);
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_CPU_IDLE
|
|
static inline void idle_set_state(struct rq *rq,
|
|
struct cpuidle_state *idle_state)
|
|
{
|
|
rq->idle_state = idle_state;
|
|
}
|
|
|
|
static inline struct cpuidle_state *idle_get_state(struct rq *rq)
|
|
{
|
|
SCHED_WARN_ON(!rcu_read_lock_held());
|
|
|
|
return rq->idle_state;
|
|
}
|
|
#else
|
|
static inline void idle_set_state(struct rq *rq,
|
|
struct cpuidle_state *idle_state)
|
|
{
|
|
}
|
|
|
|
static inline struct cpuidle_state *idle_get_state(struct rq *rq)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
extern void schedule_idle(void);
|
|
|
|
extern void sysrq_sched_debug_show(void);
|
|
extern void sched_init_granularity(void);
|
|
extern void update_max_interval(void);
|
|
|
|
extern void init_sched_dl_class(void);
|
|
extern void init_sched_rt_class(void);
|
|
extern void init_sched_fair_class(void);
|
|
|
|
extern void reweight_task(struct task_struct *p, int prio);
|
|
|
|
extern void resched_curr(struct rq *rq);
|
|
extern void resched_cpu(int cpu);
|
|
|
|
extern struct rt_bandwidth def_rt_bandwidth;
|
|
extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
|
|
|
|
extern struct dl_bandwidth def_dl_bandwidth;
|
|
extern void init_dl_bandwidth(struct dl_bandwidth *dl_b, u64 period, u64 runtime);
|
|
extern void init_dl_task_timer(struct sched_dl_entity *dl_se);
|
|
extern void init_dl_inactive_task_timer(struct sched_dl_entity *dl_se);
|
|
|
|
#define BW_SHIFT 20
|
|
#define BW_UNIT (1 << BW_SHIFT)
|
|
#define RATIO_SHIFT 8
|
|
#define MAX_BW_BITS (64 - BW_SHIFT)
|
|
#define MAX_BW ((1ULL << MAX_BW_BITS) - 1)
|
|
unsigned long to_ratio(u64 period, u64 runtime);
|
|
|
|
extern void init_entity_runnable_average(struct sched_entity *se);
|
|
extern void post_init_entity_util_avg(struct task_struct *p);
|
|
|
|
#ifdef CONFIG_NO_HZ_FULL
|
|
extern bool sched_can_stop_tick(struct rq *rq);
|
|
extern int __init sched_tick_offload_init(void);
|
|
|
|
/*
|
|
* Tick may be needed by tasks in the runqueue depending on their policy and
|
|
* requirements. If tick is needed, lets send the target an IPI to kick it out of
|
|
* nohz mode if necessary.
|
|
*/
|
|
static inline void sched_update_tick_dependency(struct rq *rq)
|
|
{
|
|
int cpu = cpu_of(rq);
|
|
|
|
if (!tick_nohz_full_cpu(cpu))
|
|
return;
|
|
|
|
if (sched_can_stop_tick(rq))
|
|
tick_nohz_dep_clear_cpu(cpu, TICK_DEP_BIT_SCHED);
|
|
else
|
|
tick_nohz_dep_set_cpu(cpu, TICK_DEP_BIT_SCHED);
|
|
}
|
|
#else
|
|
static inline int sched_tick_offload_init(void) { return 0; }
|
|
static inline void sched_update_tick_dependency(struct rq *rq) { }
|
|
#endif
|
|
|
|
static inline void add_nr_running(struct rq *rq, unsigned count)
|
|
{
|
|
unsigned prev_nr = rq->nr_running;
|
|
|
|
rq->nr_running = prev_nr + count;
|
|
if (trace_sched_update_nr_running_tp_enabled()) {
|
|
call_trace_sched_update_nr_running(rq, count);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
if (prev_nr < 2 && rq->nr_running >= 2) {
|
|
if (!READ_ONCE(rq->rd->overload))
|
|
WRITE_ONCE(rq->rd->overload, 1);
|
|
}
|
|
#endif
|
|
|
|
sched_update_tick_dependency(rq);
|
|
}
|
|
|
|
static inline void sub_nr_running(struct rq *rq, unsigned count)
|
|
{
|
|
rq->nr_running -= count;
|
|
if (trace_sched_update_nr_running_tp_enabled()) {
|
|
call_trace_sched_update_nr_running(rq, -count);
|
|
}
|
|
|
|
/* Check if we still need preemption */
|
|
sched_update_tick_dependency(rq);
|
|
}
|
|
|
|
extern void activate_task(struct rq *rq, struct task_struct *p, int flags);
|
|
extern void deactivate_task(struct rq *rq, struct task_struct *p, int flags);
|
|
|
|
extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags);
|
|
|
|
extern const_debug unsigned int sysctl_sched_nr_migrate;
|
|
extern const_debug unsigned int sysctl_sched_migration_cost;
|
|
|
|
#ifdef CONFIG_SCHED_HRTICK
|
|
|
|
/*
|
|
* Use hrtick when:
|
|
* - enabled by features
|
|
* - hrtimer is actually high res
|
|
*/
|
|
static inline int hrtick_enabled(struct rq *rq)
|
|
{
|
|
if (!cpu_active(cpu_of(rq)))
|
|
return 0;
|
|
return hrtimer_is_hres_active(&rq->hrtick_timer);
|
|
}
|
|
|
|
static inline int hrtick_enabled_fair(struct rq *rq)
|
|
{
|
|
if (!sched_feat(HRTICK))
|
|
return 0;
|
|
return hrtick_enabled(rq);
|
|
}
|
|
|
|
static inline int hrtick_enabled_dl(struct rq *rq)
|
|
{
|
|
if (!sched_feat(HRTICK_DL))
|
|
return 0;
|
|
return hrtick_enabled(rq);
|
|
}
|
|
|
|
void hrtick_start(struct rq *rq, u64 delay);
|
|
|
|
#else
|
|
|
|
static inline int hrtick_enabled_fair(struct rq *rq)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int hrtick_enabled_dl(struct rq *rq)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int hrtick_enabled(struct rq *rq)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_SCHED_HRTICK */
|
|
|
|
#ifndef arch_scale_freq_tick
|
|
static __always_inline
|
|
void arch_scale_freq_tick(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifndef arch_scale_freq_capacity
|
|
/**
|
|
* arch_scale_freq_capacity - get the frequency scale factor of a given CPU.
|
|
* @cpu: the CPU in question.
|
|
*
|
|
* Return: the frequency scale factor normalized against SCHED_CAPACITY_SCALE, i.e.
|
|
*
|
|
* f_curr
|
|
* ------ * SCHED_CAPACITY_SCALE
|
|
* f_max
|
|
*/
|
|
static __always_inline
|
|
unsigned long arch_scale_freq_capacity(int cpu)
|
|
{
|
|
return SCHED_CAPACITY_SCALE;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static inline bool rq_order_less(struct rq *rq1, struct rq *rq2)
|
|
{
|
|
#ifdef CONFIG_SCHED_CORE
|
|
/*
|
|
* In order to not have {0,2},{1,3} turn into into an AB-BA,
|
|
* order by core-id first and cpu-id second.
|
|
*
|
|
* Notably:
|
|
*
|
|
* double_rq_lock(0,3); will take core-0, core-1 lock
|
|
* double_rq_lock(1,2); will take core-1, core-0 lock
|
|
*
|
|
* when only cpu-id is considered.
|
|
*/
|
|
if (rq1->core->cpu < rq2->core->cpu)
|
|
return true;
|
|
if (rq1->core->cpu > rq2->core->cpu)
|
|
return false;
|
|
|
|
/*
|
|
* __sched_core_flip() relies on SMT having cpu-id lock order.
|
|
*/
|
|
#endif
|
|
return rq1->cpu < rq2->cpu;
|
|
}
|
|
|
|
extern void double_rq_lock(struct rq *rq1, struct rq *rq2);
|
|
|
|
#ifdef CONFIG_PREEMPTION
|
|
|
|
/*
|
|
* fair double_lock_balance: Safely acquires both rq->locks in a fair
|
|
* way at the expense of forcing extra atomic operations in all
|
|
* invocations. This assures that the double_lock is acquired using the
|
|
* same underlying policy as the spinlock_t on this architecture, which
|
|
* reduces latency compared to the unfair variant below. However, it
|
|
* also adds more overhead and therefore may reduce throughput.
|
|
*/
|
|
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
|
|
__releases(this_rq->lock)
|
|
__acquires(busiest->lock)
|
|
__acquires(this_rq->lock)
|
|
{
|
|
raw_spin_rq_unlock(this_rq);
|
|
double_rq_lock(this_rq, busiest);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#else
|
|
/*
|
|
* Unfair double_lock_balance: Optimizes throughput at the expense of
|
|
* latency by eliminating extra atomic operations when the locks are
|
|
* already in proper order on entry. This favors lower CPU-ids and will
|
|
* grant the double lock to lower CPUs over higher ids under contention,
|
|
* regardless of entry order into the function.
|
|
*/
|
|
static inline int _double_lock_balance(struct rq *this_rq, struct rq *busiest)
|
|
__releases(this_rq->lock)
|
|
__acquires(busiest->lock)
|
|
__acquires(this_rq->lock)
|
|
{
|
|
if (rq_lockp(this_rq) == rq_lockp(busiest))
|
|
return 0;
|
|
|
|
if (likely(raw_spin_rq_trylock(busiest)))
|
|
return 0;
|
|
|
|
if (rq_order_less(this_rq, busiest)) {
|
|
raw_spin_rq_lock_nested(busiest, SINGLE_DEPTH_NESTING);
|
|
return 0;
|
|
}
|
|
|
|
raw_spin_rq_unlock(this_rq);
|
|
double_rq_lock(this_rq, busiest);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#endif /* CONFIG_PREEMPTION */
|
|
|
|
/*
|
|
* double_lock_balance - lock the busiest runqueue, this_rq is locked already.
|
|
*/
|
|
static inline int double_lock_balance(struct rq *this_rq, struct rq *busiest)
|
|
{
|
|
lockdep_assert_irqs_disabled();
|
|
|
|
return _double_lock_balance(this_rq, busiest);
|
|
}
|
|
|
|
static inline void double_unlock_balance(struct rq *this_rq, struct rq *busiest)
|
|
__releases(busiest->lock)
|
|
{
|
|
if (rq_lockp(this_rq) != rq_lockp(busiest))
|
|
raw_spin_rq_unlock(busiest);
|
|
lock_set_subclass(&rq_lockp(this_rq)->dep_map, 0, _RET_IP_);
|
|
}
|
|
|
|
static inline void double_lock(spinlock_t *l1, spinlock_t *l2)
|
|
{
|
|
if (l1 > l2)
|
|
swap(l1, l2);
|
|
|
|
spin_lock(l1);
|
|
spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
|
|
}
|
|
|
|
static inline void double_lock_irq(spinlock_t *l1, spinlock_t *l2)
|
|
{
|
|
if (l1 > l2)
|
|
swap(l1, l2);
|
|
|
|
spin_lock_irq(l1);
|
|
spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
|
|
}
|
|
|
|
static inline void double_raw_lock(raw_spinlock_t *l1, raw_spinlock_t *l2)
|
|
{
|
|
if (l1 > l2)
|
|
swap(l1, l2);
|
|
|
|
raw_spin_lock(l1);
|
|
raw_spin_lock_nested(l2, SINGLE_DEPTH_NESTING);
|
|
}
|
|
|
|
/*
|
|
* double_rq_unlock - safely unlock two runqueues
|
|
*
|
|
* Note this does not restore interrupts like task_rq_unlock,
|
|
* you need to do so manually after calling.
|
|
*/
|
|
static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
|
|
__releases(rq1->lock)
|
|
__releases(rq2->lock)
|
|
{
|
|
if (rq_lockp(rq1) != rq_lockp(rq2))
|
|
raw_spin_rq_unlock(rq2);
|
|
else
|
|
__release(rq2->lock);
|
|
raw_spin_rq_unlock(rq1);
|
|
}
|
|
|
|
extern void set_rq_online (struct rq *rq);
|
|
extern void set_rq_offline(struct rq *rq);
|
|
extern bool sched_smp_initialized;
|
|
|
|
#else /* CONFIG_SMP */
|
|
|
|
/*
|
|
* double_rq_lock - safely lock two runqueues
|
|
*
|
|
* Note this does not disable interrupts like task_rq_lock,
|
|
* you need to do so manually before calling.
|
|
*/
|
|
static inline void double_rq_lock(struct rq *rq1, struct rq *rq2)
|
|
__acquires(rq1->lock)
|
|
__acquires(rq2->lock)
|
|
{
|
|
BUG_ON(!irqs_disabled());
|
|
BUG_ON(rq1 != rq2);
|
|
raw_spin_rq_lock(rq1);
|
|
__acquire(rq2->lock); /* Fake it out ;) */
|
|
}
|
|
|
|
/*
|
|
* double_rq_unlock - safely unlock two runqueues
|
|
*
|
|
* Note this does not restore interrupts like task_rq_unlock,
|
|
* you need to do so manually after calling.
|
|
*/
|
|
static inline void double_rq_unlock(struct rq *rq1, struct rq *rq2)
|
|
__releases(rq1->lock)
|
|
__releases(rq2->lock)
|
|
{
|
|
BUG_ON(rq1 != rq2);
|
|
raw_spin_rq_unlock(rq1);
|
|
__release(rq2->lock);
|
|
}
|
|
|
|
#endif
|
|
|
|
extern struct sched_entity *__pick_first_entity(struct cfs_rq *cfs_rq);
|
|
extern struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq);
|
|
|
|
#ifdef CONFIG_SCHED_DEBUG
|
|
extern bool sched_debug_verbose;
|
|
|
|
extern void print_cfs_stats(struct seq_file *m, int cpu);
|
|
extern void print_rt_stats(struct seq_file *m, int cpu);
|
|
extern void print_dl_stats(struct seq_file *m, int cpu);
|
|
extern void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq);
|
|
extern void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq);
|
|
extern void print_dl_rq(struct seq_file *m, int cpu, struct dl_rq *dl_rq);
|
|
|
|
extern void resched_latency_warn(int cpu, u64 latency);
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
extern void
|
|
show_numa_stats(struct task_struct *p, struct seq_file *m);
|
|
extern void
|
|
print_numa_stats(struct seq_file *m, int node, unsigned long tsf,
|
|
unsigned long tpf, unsigned long gsf, unsigned long gpf);
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
#else
|
|
static inline void resched_latency_warn(int cpu, u64 latency) {}
|
|
#endif /* CONFIG_SCHED_DEBUG */
|
|
|
|
extern void init_cfs_rq(struct cfs_rq *cfs_rq);
|
|
extern void init_rt_rq(struct rt_rq *rt_rq);
|
|
extern void init_dl_rq(struct dl_rq *dl_rq);
|
|
|
|
extern void cfs_bandwidth_usage_inc(void);
|
|
extern void cfs_bandwidth_usage_dec(void);
|
|
|
|
#ifdef CONFIG_NO_HZ_COMMON
|
|
#define NOHZ_BALANCE_KICK_BIT 0
|
|
#define NOHZ_STATS_KICK_BIT 1
|
|
#define NOHZ_NEWILB_KICK_BIT 2
|
|
|
|
#define NOHZ_BALANCE_KICK BIT(NOHZ_BALANCE_KICK_BIT)
|
|
#define NOHZ_STATS_KICK BIT(NOHZ_STATS_KICK_BIT)
|
|
#define NOHZ_NEWILB_KICK BIT(NOHZ_NEWILB_KICK_BIT)
|
|
|
|
#define NOHZ_KICK_MASK (NOHZ_BALANCE_KICK | NOHZ_STATS_KICK)
|
|
|
|
#define nohz_flags(cpu) (&cpu_rq(cpu)->nohz_flags)
|
|
|
|
extern void nohz_balance_exit_idle(struct rq *rq);
|
|
#else
|
|
static inline void nohz_balance_exit_idle(struct rq *rq) { }
|
|
#endif
|
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
|
|
extern void nohz_run_idle_balance(int cpu);
|
|
#else
|
|
static inline void nohz_run_idle_balance(int cpu) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline
|
|
void __dl_update(struct dl_bw *dl_b, s64 bw)
|
|
{
|
|
struct root_domain *rd = container_of(dl_b, struct root_domain, dl_bw);
|
|
int i;
|
|
|
|
RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(),
|
|
"sched RCU must be held");
|
|
for_each_cpu_and(i, rd->span, cpu_active_mask) {
|
|
struct rq *rq = cpu_rq(i);
|
|
|
|
rq->dl.extra_bw += bw;
|
|
}
|
|
}
|
|
#else
|
|
static inline
|
|
void __dl_update(struct dl_bw *dl_b, s64 bw)
|
|
{
|
|
struct dl_rq *dl = container_of(dl_b, struct dl_rq, dl_bw);
|
|
|
|
dl->extra_bw += bw;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
|
|
struct irqtime {
|
|
u64 total;
|
|
u64 tick_delta;
|
|
u64 irq_start_time;
|
|
struct u64_stats_sync sync;
|
|
};
|
|
|
|
DECLARE_PER_CPU(struct irqtime, cpu_irqtime);
|
|
|
|
/*
|
|
* Returns the irqtime minus the softirq time computed by ksoftirqd.
|
|
* Otherwise ksoftirqd's sum_exec_runtime is subtracted its own runtime
|
|
* and never move forward.
|
|
*/
|
|
static inline u64 irq_time_read(int cpu)
|
|
{
|
|
struct irqtime *irqtime = &per_cpu(cpu_irqtime, cpu);
|
|
unsigned int seq;
|
|
u64 total;
|
|
|
|
do {
|
|
seq = __u64_stats_fetch_begin(&irqtime->sync);
|
|
total = irqtime->total;
|
|
} while (__u64_stats_fetch_retry(&irqtime->sync, seq));
|
|
|
|
return total;
|
|
}
|
|
#endif /* CONFIG_IRQ_TIME_ACCOUNTING */
|
|
|
|
#ifdef CONFIG_CPU_FREQ
|
|
DECLARE_PER_CPU(struct update_util_data __rcu *, cpufreq_update_util_data);
|
|
|
|
/**
|
|
* cpufreq_update_util - Take a note about CPU utilization changes.
|
|
* @rq: Runqueue to carry out the update for.
|
|
* @flags: Update reason flags.
|
|
*
|
|
* This function is called by the scheduler on the CPU whose utilization is
|
|
* being updated.
|
|
*
|
|
* It can only be called from RCU-sched read-side critical sections.
|
|
*
|
|
* The way cpufreq is currently arranged requires it to evaluate the CPU
|
|
* performance state (frequency/voltage) on a regular basis to prevent it from
|
|
* being stuck in a completely inadequate performance level for too long.
|
|
* That is not guaranteed to happen if the updates are only triggered from CFS
|
|
* and DL, though, because they may not be coming in if only RT tasks are
|
|
* active all the time (or there are RT tasks only).
|
|
*
|
|
* As a workaround for that issue, this function is called periodically by the
|
|
* RT sched class to trigger extra cpufreq updates to prevent it from stalling,
|
|
* but that really is a band-aid. Going forward it should be replaced with
|
|
* solutions targeted more specifically at RT tasks.
|
|
*/
|
|
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags)
|
|
{
|
|
struct update_util_data *data;
|
|
|
|
data = rcu_dereference_sched(*per_cpu_ptr(&cpufreq_update_util_data,
|
|
cpu_of(rq)));
|
|
if (data)
|
|
data->func(data, rq_clock(rq), flags);
|
|
}
|
|
#else
|
|
static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
|
|
#endif /* CONFIG_CPU_FREQ */
|
|
|
|
#ifdef CONFIG_UCLAMP_TASK
|
|
unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
|
|
|
|
/**
|
|
* uclamp_rq_util_with - clamp @util with @rq and @p effective uclamp values.
|
|
* @rq: The rq to clamp against. Must not be NULL.
|
|
* @util: The util value to clamp.
|
|
* @p: The task to clamp against. Can be NULL if you want to clamp
|
|
* against @rq only.
|
|
*
|
|
* Clamps the passed @util to the max(@rq, @p) effective uclamp values.
|
|
*
|
|
* If sched_uclamp_used static key is disabled, then just return the util
|
|
* without any clamping since uclamp aggregation at the rq level in the fast
|
|
* path is disabled, rendering this operation a NOP.
|
|
*
|
|
* Use uclamp_eff_value() if you don't care about uclamp values at rq level. It
|
|
* will return the correct effective uclamp value of the task even if the
|
|
* static key is disabled.
|
|
*/
|
|
static __always_inline
|
|
unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
|
|
struct task_struct *p)
|
|
{
|
|
unsigned long min_util;
|
|
unsigned long max_util;
|
|
|
|
if (!static_branch_likely(&sched_uclamp_used))
|
|
return util;
|
|
|
|
min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value);
|
|
max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
|
|
|
|
if (p) {
|
|
min_util = max(min_util, uclamp_eff_value(p, UCLAMP_MIN));
|
|
max_util = max(max_util, uclamp_eff_value(p, UCLAMP_MAX));
|
|
}
|
|
|
|
/*
|
|
* Since CPU's {min,max}_util clamps are MAX aggregated considering
|
|
* RUNNABLE tasks with _different_ clamps, we can end up with an
|
|
* inversion. Fix it now when the clamps are applied.
|
|
*/
|
|
if (unlikely(min_util >= max_util))
|
|
return min_util;
|
|
|
|
return clamp(util, min_util, max_util);
|
|
}
|
|
|
|
/*
|
|
* When uclamp is compiled in, the aggregation at rq level is 'turned off'
|
|
* by default in the fast path and only gets turned on once userspace performs
|
|
* an operation that requires it.
|
|
*
|
|
* Returns true if userspace opted-in to use uclamp and aggregation at rq level
|
|
* hence is active.
|
|
*/
|
|
static inline bool uclamp_is_used(void)
|
|
{
|
|
return static_branch_likely(&sched_uclamp_used);
|
|
}
|
|
#else /* CONFIG_UCLAMP_TASK */
|
|
static inline
|
|
unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
|
|
struct task_struct *p)
|
|
{
|
|
return util;
|
|
}
|
|
|
|
static inline bool uclamp_is_used(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_UCLAMP_TASK */
|
|
|
|
#ifdef arch_scale_freq_capacity
|
|
# ifndef arch_scale_freq_invariant
|
|
# define arch_scale_freq_invariant() true
|
|
# endif
|
|
#else
|
|
# define arch_scale_freq_invariant() false
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline unsigned long capacity_orig_of(int cpu)
|
|
{
|
|
return cpu_rq(cpu)->cpu_capacity_orig;
|
|
}
|
|
|
|
/**
|
|
* enum cpu_util_type - CPU utilization type
|
|
* @FREQUENCY_UTIL: Utilization used to select frequency
|
|
* @ENERGY_UTIL: Utilization used during energy calculation
|
|
*
|
|
* The utilization signals of all scheduling classes (CFS/RT/DL) and IRQ time
|
|
* need to be aggregated differently depending on the usage made of them. This
|
|
* enum is used within effective_cpu_util() to differentiate the types of
|
|
* utilization expected by the callers, and adjust the aggregation accordingly.
|
|
*/
|
|
enum cpu_util_type {
|
|
FREQUENCY_UTIL,
|
|
ENERGY_UTIL,
|
|
};
|
|
|
|
unsigned long effective_cpu_util(int cpu, unsigned long util_cfs,
|
|
unsigned long max, enum cpu_util_type type,
|
|
struct task_struct *p);
|
|
|
|
static inline unsigned long cpu_bw_dl(struct rq *rq)
|
|
{
|
|
return (rq->dl.running_bw * SCHED_CAPACITY_SCALE) >> BW_SHIFT;
|
|
}
|
|
|
|
static inline unsigned long cpu_util_dl(struct rq *rq)
|
|
{
|
|
return READ_ONCE(rq->avg_dl.util_avg);
|
|
}
|
|
|
|
static inline unsigned long cpu_util_cfs(struct rq *rq)
|
|
{
|
|
unsigned long util = READ_ONCE(rq->cfs.avg.util_avg);
|
|
|
|
if (sched_feat(UTIL_EST)) {
|
|
util = max_t(unsigned long, util,
|
|
READ_ONCE(rq->cfs.avg.util_est.enqueued));
|
|
}
|
|
|
|
return util;
|
|
}
|
|
|
|
static inline unsigned long cpu_util_rt(struct rq *rq)
|
|
{
|
|
return READ_ONCE(rq->avg_rt.util_avg);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_SCHED_AVG_IRQ
|
|
static inline unsigned long cpu_util_irq(struct rq *rq)
|
|
{
|
|
return rq->avg_irq.util_avg;
|
|
}
|
|
|
|
static inline
|
|
unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
|
|
{
|
|
util *= (max - irq);
|
|
util /= max;
|
|
|
|
return util;
|
|
|
|
}
|
|
#else
|
|
static inline unsigned long cpu_util_irq(struct rq *rq)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline
|
|
unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned long max)
|
|
{
|
|
return util;
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
|
|
|
|
#define perf_domain_span(pd) (to_cpumask(((pd)->em_pd->cpus)))
|
|
|
|
DECLARE_STATIC_KEY_FALSE(sched_energy_present);
|
|
|
|
static inline bool sched_energy_enabled(void)
|
|
{
|
|
return static_branch_unlikely(&sched_energy_present);
|
|
}
|
|
|
|
#else /* ! (CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL) */
|
|
|
|
#define perf_domain_span(pd) NULL
|
|
static inline bool sched_energy_enabled(void) { return false; }
|
|
|
|
#endif /* CONFIG_ENERGY_MODEL && CONFIG_CPU_FREQ_GOV_SCHEDUTIL */
|
|
|
|
#ifdef CONFIG_MEMBARRIER
|
|
/*
|
|
* The scheduler provides memory barriers required by membarrier between:
|
|
* - prior user-space memory accesses and store to rq->membarrier_state,
|
|
* - store to rq->membarrier_state and following user-space memory accesses.
|
|
* In the same way it provides those guarantees around store to rq->curr.
|
|
*/
|
|
static inline void membarrier_switch_mm(struct rq *rq,
|
|
struct mm_struct *prev_mm,
|
|
struct mm_struct *next_mm)
|
|
{
|
|
int membarrier_state;
|
|
|
|
if (prev_mm == next_mm)
|
|
return;
|
|
|
|
membarrier_state = atomic_read(&next_mm->membarrier_state);
|
|
if (READ_ONCE(rq->membarrier_state) == membarrier_state)
|
|
return;
|
|
|
|
WRITE_ONCE(rq->membarrier_state, membarrier_state);
|
|
}
|
|
#else
|
|
static inline void membarrier_switch_mm(struct rq *rq,
|
|
struct mm_struct *prev_mm,
|
|
struct mm_struct *next_mm)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline bool is_per_cpu_kthread(struct task_struct *p)
|
|
{
|
|
if (!(p->flags & PF_KTHREAD))
|
|
return false;
|
|
|
|
if (p->nr_cpus_allowed != 1)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
extern void swake_up_all_locked(struct swait_queue_head *q);
|
|
extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
|
|
|
|
#ifdef CONFIG_PREEMPT_DYNAMIC
|
|
extern int preempt_dynamic_mode;
|
|
extern int sched_dynamic_mode(const char *str);
|
|
extern void sched_dynamic_update(int mode);
|
|
#endif
|
|
|