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sched: Unify runtime accounting across classes

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All classes use sched_entity::exec_start to track runtime and have
copies of the exact same code around to compute runtime.

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Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Phil Auld <pauld@redhat.com>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lkml.kernel.org/r/54d148a144f26d9559698c4dd82d8859038a7380.1699095159.git.bristot@kernel.org
This commit is contained in:
Peter Zijlstra 2023-11-04 11:59:18 +01:00
parent ee4373dc90
commit 5d69eca542
6 changed files with 53 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/sched.h
View File

@ -523,7 +523,7 @@ struct sched_statistics {
u64 block_max;
s64 sum_block_runtime;
u64 exec_max;
s64 exec_max;
u64 slice_max;
u64 nr_migrations_cold;

15
kernel/sched/deadline.c
View File

@ -1275,9 +1275,8 @@ static void update_curr_dl(struct rq *rq)
{
struct task_struct *curr = rq->curr;
struct sched_dl_entity *dl_se = &curr->dl;
u64 delta_exec, scaled_delta_exec;
s64 delta_exec, scaled_delta_exec;
int cpu = cpu_of(rq);
u64 now;
if (!dl_task(curr) || !on_dl_rq(dl_se))
return;
@ -1290,21 +1289,13 @@ static void update_curr_dl(struct rq *rq)
* natural solution, but the full ramifications of this
* approach need further study.
*/
now = rq_clock_task(rq);
delta_exec = now - curr->se.exec_start;
if (unlikely((s64)delta_exec <= 0)) {
delta_exec = update_curr_common(rq);
if (unlikely(delta_exec <= 0)) {
if (unlikely(dl_se->dl_yielded))
goto throttle;
return;
}
schedstat_set(curr->stats.exec_max,
max(curr->stats.exec_max, delta_exec));
trace_sched_stat_runtime(curr, delta_exec, 0);
update_current_exec_runtime(curr, now, delta_exec);
if (dl_entity_is_special(dl_se))
return;

57
kernel/sched/fair.c
View File

@ -1103,23 +1103,17 @@ static void update_tg_load_avg(struct cfs_rq *cfs_rq)
}
#endif /* CONFIG_SMP */
/*
* Update the current task's runtime statistics.
*/
static void update_curr(struct cfs_rq *cfs_rq)
static s64 update_curr_se(struct rq *rq, struct sched_entity *curr)
{
struct sched_entity *curr = cfs_rq->curr;
u64 now = rq_clock_task(rq_of(cfs_rq));
u64 delta_exec;
if (unlikely(!curr))
return;
u64 now = rq_clock_task(rq);
s64 delta_exec;
delta_exec = now - curr->exec_start;
if (unlikely((s64)delta_exec <= 0))
return;
if (unlikely(delta_exec <= 0))
return delta_exec;
curr->exec_start = now;
curr->sum_exec_runtime += delta_exec;
if (schedstat_enabled()) {
struct sched_statistics *stats;
@ -1129,8 +1123,43 @@ static void update_curr(struct cfs_rq *cfs_rq)
max(delta_exec, stats->exec_max));
}
curr->sum_exec_runtime += delta_exec;
schedstat_add(cfs_rq->exec_clock, delta_exec);
return delta_exec;
}
/*
* Used by other classes to account runtime.
*/
s64 update_curr_common(struct rq *rq)
{
struct task_struct *curr = rq->curr;
s64 delta_exec;
delta_exec = update_curr_se(rq, &curr->se);
if (unlikely(delta_exec <= 0))
return delta_exec;
trace_sched_stat_runtime(curr, delta_exec, 0);
account_group_exec_runtime(curr, delta_exec);
cgroup_account_cputime(curr, delta_exec);
return delta_exec;
}
/*
* Update the current task's runtime statistics.
*/
static void update_curr(struct cfs_rq *cfs_rq)
{
struct sched_entity *curr = cfs_rq->curr;
s64 delta_exec;
if (unlikely(!curr))
return;
delta_exec = update_curr_se(rq_of(cfs_rq), curr);
if (unlikely(delta_exec <= 0))
return;
curr->vruntime += calc_delta_fair(delta_exec, curr);
update_deadline(cfs_rq, curr);

15
kernel/sched/rt.c
View File

@ -1002,24 +1002,15 @@ static void update_curr_rt(struct rq *rq)
{
struct task_struct *curr = rq->curr;
struct sched_rt_entity *rt_se = &curr->rt;
u64 delta_exec;
u64 now;
s64 delta_exec;
if (curr->sched_class != &rt_sched_class)
return;
now = rq_clock_task(rq);
delta_exec = now - curr->se.exec_start;
if (unlikely((s64)delta_exec <= 0))
delta_exec = update_curr_common(rq);
if (unlikely(delta_exec <= 0))
return;
schedstat_set(curr->stats.exec_max,
max(curr->stats.exec_max, delta_exec));
trace_sched_stat_runtime(curr, delta_exec, 0);
update_current_exec_runtime(curr, now, delta_exec);
if (!rt_bandwidth_enabled())
return;

12
kernel/sched/sched.h
View File

@ -2212,6 +2212,8 @@ struct affinity_context {
unsigned int flags;
};
extern s64 update_curr_common(struct rq *rq);
struct sched_class {
#ifdef CONFIG_UCLAMP_TASK
@ -3262,16 +3264,6 @@ extern int sched_dynamic_mode(const char *str);
extern void sched_dynamic_update(int mode);
#endif
static inline void update_current_exec_runtime(struct task_struct *curr,
u64 now, u64 delta_exec)
{
curr->se.sum_exec_runtime += delta_exec;
account_group_exec_runtime(curr, delta_exec);
curr->se.exec_start = now;
cgroup_account_cputime(curr, delta_exec);
}
#ifdef CONFIG_SCHED_MM_CID
#define SCHED_MM_CID_PERIOD_NS (100ULL * 1000000) /* 100ms */

13
kernel/sched/stop_task.c
View File

@ -70,18 +70,7 @@ static void yield_task_stop(struct rq *rq)
static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
{
struct task_struct *curr = rq->curr;
u64 now, delta_exec;
now = rq_clock_task(rq);
delta_exec = now - curr->se.exec_start;
if (unlikely((s64)delta_exec < 0))
delta_exec = 0;
schedstat_set(curr->stats.exec_max,
max(curr->stats.exec_max, delta_exec));
update_current_exec_runtime(curr, now, delta_exec);
update_curr_common(rq);
}
/*