forked from Minki/linux
80d02085d9
This reverts commit e59fb3120b.
This reversion was due to (extreme) boot-time slowdowns on SPARC seen by
Yinghai Lu and on x86 by Ingo
.
This is a non-trivial reversion due to intervening commits.
Conflicts:
Documentation/RCU/trace.txt
kernel/rcutree.c
Signed-off-by: Ingo Molnar <mingo@elte.hu>
459 lines
18 KiB
C
459 lines
18 KiB
C
/*
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* Read-Copy Update mechanism for mutual exclusion (tree-based version)
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* Internal non-public definitions.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright IBM Corporation, 2008
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*
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* Author: Ingo Molnar <mingo@elte.hu>
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* Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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*/
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#include <linux/cache.h>
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#include <linux/spinlock.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/seqlock.h>
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/*
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* Define shape of hierarchy based on NR_CPUS and CONFIG_RCU_FANOUT.
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* In theory, it should be possible to add more levels straightforwardly.
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* In practice, this did work well going from three levels to four.
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* Of course, your mileage may vary.
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*/
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#define MAX_RCU_LVLS 4
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#if CONFIG_RCU_FANOUT > 16
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#define RCU_FANOUT_LEAF 16
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#else /* #if CONFIG_RCU_FANOUT > 16 */
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#define RCU_FANOUT_LEAF (CONFIG_RCU_FANOUT)
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#endif /* #else #if CONFIG_RCU_FANOUT > 16 */
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#define RCU_FANOUT_1 (RCU_FANOUT_LEAF)
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#define RCU_FANOUT_2 (RCU_FANOUT_1 * CONFIG_RCU_FANOUT)
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#define RCU_FANOUT_3 (RCU_FANOUT_2 * CONFIG_RCU_FANOUT)
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#define RCU_FANOUT_4 (RCU_FANOUT_3 * CONFIG_RCU_FANOUT)
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#if NR_CPUS <= RCU_FANOUT_1
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# define NUM_RCU_LVLS 1
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# define NUM_RCU_LVL_0 1
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# define NUM_RCU_LVL_1 (NR_CPUS)
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# define NUM_RCU_LVL_2 0
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# define NUM_RCU_LVL_3 0
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# define NUM_RCU_LVL_4 0
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#elif NR_CPUS <= RCU_FANOUT_2
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# define NUM_RCU_LVLS 2
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# define NUM_RCU_LVL_0 1
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# define NUM_RCU_LVL_1 DIV_ROUND_UP(NR_CPUS, RCU_FANOUT_1)
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# define NUM_RCU_LVL_2 (NR_CPUS)
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# define NUM_RCU_LVL_3 0
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# define NUM_RCU_LVL_4 0
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#elif NR_CPUS <= RCU_FANOUT_3
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# define NUM_RCU_LVLS 3
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# define NUM_RCU_LVL_0 1
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# define NUM_RCU_LVL_1 DIV_ROUND_UP(NR_CPUS, RCU_FANOUT_2)
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# define NUM_RCU_LVL_2 DIV_ROUND_UP(NR_CPUS, RCU_FANOUT_1)
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# define NUM_RCU_LVL_3 (NR_CPUS)
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# define NUM_RCU_LVL_4 0
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#elif NR_CPUS <= RCU_FANOUT_4
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# define NUM_RCU_LVLS 4
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# define NUM_RCU_LVL_0 1
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# define NUM_RCU_LVL_1 DIV_ROUND_UP(NR_CPUS, RCU_FANOUT_3)
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# define NUM_RCU_LVL_2 DIV_ROUND_UP(NR_CPUS, RCU_FANOUT_2)
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# define NUM_RCU_LVL_3 DIV_ROUND_UP(NR_CPUS, RCU_FANOUT_1)
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# define NUM_RCU_LVL_4 (NR_CPUS)
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#else
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# error "CONFIG_RCU_FANOUT insufficient for NR_CPUS"
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#endif /* #if (NR_CPUS) <= RCU_FANOUT_1 */
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#define RCU_SUM (NUM_RCU_LVL_0 + NUM_RCU_LVL_1 + NUM_RCU_LVL_2 + NUM_RCU_LVL_3 + NUM_RCU_LVL_4)
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#define NUM_RCU_NODES (RCU_SUM - NR_CPUS)
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/*
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* Dynticks per-CPU state.
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*/
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struct rcu_dynticks {
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int dynticks_nesting; /* Track nesting level, sort of. */
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int dynticks; /* Even value for dynticks-idle, else odd. */
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int dynticks_nmi; /* Even value for either dynticks-idle or */
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/* not in nmi handler, else odd. So this */
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/* remains even for nmi from irq handler. */
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};
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/* RCU's kthread states for tracing. */
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#define RCU_KTHREAD_STOPPED 0
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#define RCU_KTHREAD_RUNNING 1
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#define RCU_KTHREAD_WAITING 2
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#define RCU_KTHREAD_OFFCPU 3
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#define RCU_KTHREAD_YIELDING 4
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#define RCU_KTHREAD_MAX 4
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/*
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* Definition for node within the RCU grace-period-detection hierarchy.
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*/
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struct rcu_node {
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raw_spinlock_t lock; /* Root rcu_node's lock protects some */
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/* rcu_state fields as well as following. */
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unsigned long gpnum; /* Current grace period for this node. */
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/* This will either be equal to or one */
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/* behind the root rcu_node's gpnum. */
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unsigned long completed; /* Last GP completed for this node. */
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/* This will either be equal to or one */
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/* behind the root rcu_node's gpnum. */
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unsigned long qsmask; /* CPUs or groups that need to switch in */
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/* order for current grace period to proceed.*/
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/* In leaf rcu_node, each bit corresponds to */
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/* an rcu_data structure, otherwise, each */
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/* bit corresponds to a child rcu_node */
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/* structure. */
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unsigned long expmask; /* Groups that have ->blkd_tasks */
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/* elements that need to drain to allow the */
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/* current expedited grace period to */
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/* complete (only for TREE_PREEMPT_RCU). */
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unsigned long wakemask; /* CPUs whose kthread needs to be awakened. */
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unsigned long qsmaskinit;
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/* Per-GP initial value for qsmask & expmask. */
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unsigned long grpmask; /* Mask to apply to parent qsmask. */
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/* Only one bit will be set in this mask. */
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int grplo; /* lowest-numbered CPU or group here. */
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int grphi; /* highest-numbered CPU or group here. */
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u8 grpnum; /* CPU/group number for next level up. */
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u8 level; /* root is at level 0. */
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struct rcu_node *parent;
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struct list_head blkd_tasks;
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/* Tasks blocked in RCU read-side critical */
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/* section. Tasks are placed at the head */
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/* of this list and age towards the tail. */
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struct list_head *gp_tasks;
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/* Pointer to the first task blocking the */
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/* current grace period, or NULL if there */
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/* is no such task. */
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struct list_head *exp_tasks;
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/* Pointer to the first task blocking the */
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/* current expedited grace period, or NULL */
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/* if there is no such task. If there */
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/* is no current expedited grace period, */
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/* then there can cannot be any such task. */
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#ifdef CONFIG_RCU_BOOST
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struct list_head *boost_tasks;
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/* Pointer to first task that needs to be */
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/* priority boosted, or NULL if no priority */
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/* boosting is needed for this rcu_node */
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/* structure. If there are no tasks */
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/* queued on this rcu_node structure that */
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/* are blocking the current grace period, */
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/* there can be no such task. */
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unsigned long boost_time;
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/* When to start boosting (jiffies). */
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struct task_struct *boost_kthread_task;
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/* kthread that takes care of priority */
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/* boosting for this rcu_node structure. */
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wait_queue_head_t boost_wq;
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/* Wait queue on which to park the boost */
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/* kthread. */
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unsigned int boost_kthread_status;
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/* State of boost_kthread_task for tracing. */
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unsigned long n_tasks_boosted;
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/* Total number of tasks boosted. */
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unsigned long n_exp_boosts;
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/* Number of tasks boosted for expedited GP. */
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unsigned long n_normal_boosts;
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/* Number of tasks boosted for normal GP. */
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unsigned long n_balk_blkd_tasks;
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/* Refused to boost: no blocked tasks. */
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unsigned long n_balk_exp_gp_tasks;
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/* Refused to boost: nothing blocking GP. */
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unsigned long n_balk_boost_tasks;
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/* Refused to boost: already boosting. */
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unsigned long n_balk_notblocked;
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/* Refused to boost: RCU RS CS still running. */
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unsigned long n_balk_notyet;
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/* Refused to boost: not yet time. */
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unsigned long n_balk_nos;
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/* Refused to boost: not sure why, though. */
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/* This can happen due to race conditions. */
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#endif /* #ifdef CONFIG_RCU_BOOST */
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struct task_struct *node_kthread_task;
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/* kthread that takes care of this rcu_node */
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/* structure, for example, awakening the */
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/* per-CPU kthreads as needed. */
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wait_queue_head_t node_wq;
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/* Wait queue on which to park the per-node */
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/* kthread. */
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unsigned int node_kthread_status;
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/* State of node_kthread_task for tracing. */
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} ____cacheline_internodealigned_in_smp;
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/*
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* Do a full breadth-first scan of the rcu_node structures for the
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* specified rcu_state structure.
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*/
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#define rcu_for_each_node_breadth_first(rsp, rnp) \
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for ((rnp) = &(rsp)->node[0]; \
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(rnp) < &(rsp)->node[NUM_RCU_NODES]; (rnp)++)
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/*
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* Do a breadth-first scan of the non-leaf rcu_node structures for the
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* specified rcu_state structure. Note that if there is a singleton
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* rcu_node tree with but one rcu_node structure, this loop is a no-op.
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*/
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#define rcu_for_each_nonleaf_node_breadth_first(rsp, rnp) \
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for ((rnp) = &(rsp)->node[0]; \
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(rnp) < (rsp)->level[NUM_RCU_LVLS - 1]; (rnp)++)
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/*
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* Scan the leaves of the rcu_node hierarchy for the specified rcu_state
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* structure. Note that if there is a singleton rcu_node tree with but
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* one rcu_node structure, this loop -will- visit the rcu_node structure.
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* It is still a leaf node, even if it is also the root node.
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*/
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#define rcu_for_each_leaf_node(rsp, rnp) \
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for ((rnp) = (rsp)->level[NUM_RCU_LVLS - 1]; \
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(rnp) < &(rsp)->node[NUM_RCU_NODES]; (rnp)++)
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/* Index values for nxttail array in struct rcu_data. */
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#define RCU_DONE_TAIL 0 /* Also RCU_WAIT head. */
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#define RCU_WAIT_TAIL 1 /* Also RCU_NEXT_READY head. */
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#define RCU_NEXT_READY_TAIL 2 /* Also RCU_NEXT head. */
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#define RCU_NEXT_TAIL 3
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#define RCU_NEXT_SIZE 4
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/* Per-CPU data for read-copy update. */
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struct rcu_data {
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/* 1) quiescent-state and grace-period handling : */
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unsigned long completed; /* Track rsp->completed gp number */
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/* in order to detect GP end. */
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unsigned long gpnum; /* Highest gp number that this CPU */
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/* is aware of having started. */
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unsigned long passed_quiesc_completed;
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/* Value of completed at time of qs. */
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bool passed_quiesc; /* User-mode/idle loop etc. */
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bool qs_pending; /* Core waits for quiesc state. */
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bool beenonline; /* CPU online at least once. */
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bool preemptible; /* Preemptible RCU? */
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struct rcu_node *mynode; /* This CPU's leaf of hierarchy */
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unsigned long grpmask; /* Mask to apply to leaf qsmask. */
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/* 2) batch handling */
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/*
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* If nxtlist is not NULL, it is partitioned as follows.
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* Any of the partitions might be empty, in which case the
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* pointer to that partition will be equal to the pointer for
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* the following partition. When the list is empty, all of
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* the nxttail elements point to the ->nxtlist pointer itself,
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* which in that case is NULL.
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*
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* [nxtlist, *nxttail[RCU_DONE_TAIL]):
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* Entries that batch # <= ->completed
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* The grace period for these entries has completed, and
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* the other grace-period-completed entries may be moved
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* here temporarily in rcu_process_callbacks().
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* [*nxttail[RCU_DONE_TAIL], *nxttail[RCU_WAIT_TAIL]):
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* Entries that batch # <= ->completed - 1: waiting for current GP
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* [*nxttail[RCU_WAIT_TAIL], *nxttail[RCU_NEXT_READY_TAIL]):
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* Entries known to have arrived before current GP ended
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* [*nxttail[RCU_NEXT_READY_TAIL], *nxttail[RCU_NEXT_TAIL]):
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* Entries that might have arrived after current GP ended
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* Note that the value of *nxttail[RCU_NEXT_TAIL] will
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* always be NULL, as this is the end of the list.
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*/
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struct rcu_head *nxtlist;
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struct rcu_head **nxttail[RCU_NEXT_SIZE];
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long qlen; /* # of queued callbacks */
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long qlen_last_fqs_check;
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/* qlen at last check for QS forcing */
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unsigned long n_cbs_invoked; /* count of RCU cbs invoked. */
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unsigned long n_cbs_orphaned; /* RCU cbs orphaned by dying CPU */
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unsigned long n_cbs_adopted; /* RCU cbs adopted from dying CPU */
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unsigned long n_force_qs_snap;
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/* did other CPU force QS recently? */
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long blimit; /* Upper limit on a processed batch */
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#ifdef CONFIG_NO_HZ
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/* 3) dynticks interface. */
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struct rcu_dynticks *dynticks; /* Shared per-CPU dynticks state. */
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int dynticks_snap; /* Per-GP tracking for dynticks. */
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int dynticks_nmi_snap; /* Per-GP tracking for dynticks_nmi. */
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#endif /* #ifdef CONFIG_NO_HZ */
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/* 4) reasons this CPU needed to be kicked by force_quiescent_state */
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#ifdef CONFIG_NO_HZ
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unsigned long dynticks_fqs; /* Kicked due to dynticks idle. */
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#endif /* #ifdef CONFIG_NO_HZ */
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unsigned long offline_fqs; /* Kicked due to being offline. */
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unsigned long resched_ipi; /* Sent a resched IPI. */
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/* 5) __rcu_pending() statistics. */
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unsigned long n_rcu_pending; /* rcu_pending() calls since boot. */
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unsigned long n_rp_qs_pending;
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unsigned long n_rp_report_qs;
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unsigned long n_rp_cb_ready;
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unsigned long n_rp_cpu_needs_gp;
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unsigned long n_rp_gp_completed;
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unsigned long n_rp_gp_started;
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unsigned long n_rp_need_fqs;
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unsigned long n_rp_need_nothing;
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int cpu;
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};
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/* Values for signaled field in struct rcu_state. */
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#define RCU_GP_IDLE 0 /* No grace period in progress. */
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#define RCU_GP_INIT 1 /* Grace period being initialized. */
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#define RCU_SAVE_DYNTICK 2 /* Need to scan dyntick state. */
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#define RCU_FORCE_QS 3 /* Need to force quiescent state. */
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#ifdef CONFIG_NO_HZ
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#define RCU_SIGNAL_INIT RCU_SAVE_DYNTICK
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#else /* #ifdef CONFIG_NO_HZ */
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#define RCU_SIGNAL_INIT RCU_FORCE_QS
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#endif /* #else #ifdef CONFIG_NO_HZ */
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#define RCU_JIFFIES_TILL_FORCE_QS 3 /* for rsp->jiffies_force_qs */
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#ifdef CONFIG_PROVE_RCU
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#define RCU_STALL_DELAY_DELTA (5 * HZ)
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#else
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#define RCU_STALL_DELAY_DELTA 0
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#endif
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#define RCU_SECONDS_TILL_STALL_CHECK (CONFIG_RCU_CPU_STALL_TIMEOUT * HZ + \
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RCU_STALL_DELAY_DELTA)
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/* for rsp->jiffies_stall */
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#define RCU_SECONDS_TILL_STALL_RECHECK (3 * RCU_SECONDS_TILL_STALL_CHECK + 30)
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/* for rsp->jiffies_stall */
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#define RCU_STALL_RAT_DELAY 2 /* Allow other CPUs time */
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/* to take at least one */
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/* scheduling clock irq */
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/* before ratting on them. */
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/*
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* RCU global state, including node hierarchy. This hierarchy is
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* represented in "heap" form in a dense array. The root (first level)
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* of the hierarchy is in ->node[0] (referenced by ->level[0]), the second
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* level in ->node[1] through ->node[m] (->node[1] referenced by ->level[1]),
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* and the third level in ->node[m+1] and following (->node[m+1] referenced
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* by ->level[2]). The number of levels is determined by the number of
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* CPUs and by CONFIG_RCU_FANOUT. Small systems will have a "hierarchy"
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* consisting of a single rcu_node.
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*/
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struct rcu_state {
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struct rcu_node node[NUM_RCU_NODES]; /* Hierarchy. */
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struct rcu_node *level[NUM_RCU_LVLS]; /* Hierarchy levels. */
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u32 levelcnt[MAX_RCU_LVLS + 1]; /* # nodes in each level. */
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u8 levelspread[NUM_RCU_LVLS]; /* kids/node in each level. */
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struct rcu_data __percpu *rda; /* pointer of percu rcu_data. */
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/* The following fields are guarded by the root rcu_node's lock. */
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u8 signaled ____cacheline_internodealigned_in_smp;
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/* Force QS state. */
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u8 fqs_active; /* force_quiescent_state() */
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/* is running. */
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u8 fqs_need_gp; /* A CPU was prevented from */
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/* starting a new grace */
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/* period because */
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/* force_quiescent_state() */
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/* was running. */
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unsigned long gpnum; /* Current gp number. */
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unsigned long completed; /* # of last completed gp. */
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/* End of fields guarded by root rcu_node's lock. */
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raw_spinlock_t onofflock; /* exclude on/offline and */
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/* starting new GP. */
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raw_spinlock_t fqslock; /* Only one task forcing */
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/* quiescent states. */
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unsigned long jiffies_force_qs; /* Time at which to invoke */
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/* force_quiescent_state(). */
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unsigned long n_force_qs; /* Number of calls to */
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/* force_quiescent_state(). */
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unsigned long n_force_qs_lh; /* ~Number of calls leaving */
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/* due to lock unavailable. */
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unsigned long n_force_qs_ngp; /* Number of calls leaving */
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/* due to no GP active. */
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unsigned long gp_start; /* Time at which GP started, */
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/* but in jiffies. */
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unsigned long jiffies_stall; /* Time at which to check */
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/* for CPU stalls. */
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unsigned long gp_max; /* Maximum GP duration in */
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/* jiffies. */
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char *name; /* Name of structure. */
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};
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/* Return values for rcu_preempt_offline_tasks(). */
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#define RCU_OFL_TASKS_NORM_GP 0x1 /* Tasks blocking normal */
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/* GP were moved to root. */
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#define RCU_OFL_TASKS_EXP_GP 0x2 /* Tasks blocking expedited */
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/* GP were moved to root. */
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/*
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* RCU implementation internal declarations:
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*/
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extern struct rcu_state rcu_sched_state;
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DECLARE_PER_CPU(struct rcu_data, rcu_sched_data);
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extern struct rcu_state rcu_bh_state;
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DECLARE_PER_CPU(struct rcu_data, rcu_bh_data);
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#ifdef CONFIG_TREE_PREEMPT_RCU
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extern struct rcu_state rcu_preempt_state;
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DECLARE_PER_CPU(struct rcu_data, rcu_preempt_data);
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#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
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#ifndef RCU_TREE_NONCORE
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/* Forward declarations for rcutree_plugin.h */
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static void rcu_bootup_announce(void);
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long rcu_batches_completed(void);
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static void rcu_preempt_note_context_switch(int cpu);
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static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp);
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#ifdef CONFIG_HOTPLUG_CPU
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static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp,
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unsigned long flags);
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */
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static void rcu_print_detail_task_stall(struct rcu_state *rsp);
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static void rcu_print_task_stall(struct rcu_node *rnp);
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static void rcu_preempt_stall_reset(void);
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static void rcu_preempt_check_blocked_tasks(struct rcu_node *rnp);
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#ifdef CONFIG_HOTPLUG_CPU
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static int rcu_preempt_offline_tasks(struct rcu_state *rsp,
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struct rcu_node *rnp,
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struct rcu_data *rdp);
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static void rcu_preempt_offline_cpu(int cpu);
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */
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static void rcu_preempt_check_callbacks(int cpu);
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static void rcu_preempt_process_callbacks(void);
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void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu));
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#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_TREE_PREEMPT_RCU)
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static void rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp);
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#endif /* #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_TREE_PREEMPT_RCU) */
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static int rcu_preempt_pending(int cpu);
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static int rcu_preempt_needs_cpu(int cpu);
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static void __cpuinit rcu_preempt_init_percpu_data(int cpu);
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static void rcu_preempt_send_cbs_to_online(void);
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static void __init __rcu_init_preempt(void);
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static void rcu_needs_cpu_flush(void);
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static void __init rcu_init_boost_waitqueue(struct rcu_node *rnp);
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static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);
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static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp,
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cpumask_var_t cm);
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static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);
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static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
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struct rcu_node *rnp,
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int rnp_index);
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#endif /* #ifndef RCU_TREE_NONCORE */
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