Commit b34920d4 authored by Valentin Schneider's avatar Valentin Schneider Committed by Ingo Molnar

sched/fair: Move task_numa_work() init to init_numa_balancing()

We only need to set the callback_head worker function once, do it
during sched_fork().

While at it, move the comment regarding double task_work addition to
init_numa_balancing(), since the double add sentinel is first set there.
Suggested-by: default avatarPeter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarValentin Schneider <valentin.schneider@arm.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: mgorman@suse.de
Cc: riel@surriel.com
Link: https://lkml.kernel.org/r/20190715102508.32434-3-valentin.schneider@arm.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent d35927a1
...@@ -2495,7 +2495,7 @@ void task_numa_work(struct callback_head *work) ...@@ -2495,7 +2495,7 @@ void task_numa_work(struct callback_head *work)
SCHED_WARN_ON(p != container_of(work, struct task_struct, numa_work)); SCHED_WARN_ON(p != container_of(work, struct task_struct, numa_work));
work->next = work; /* protect against double add */ work->next = work;
/* /*
* Who cares about NUMA placement when they're dying. * Who cares about NUMA placement when they're dying.
* *
...@@ -2639,12 +2639,15 @@ void init_numa_balancing(unsigned long clone_flags, struct task_struct *p) ...@@ -2639,12 +2639,15 @@ void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
p->node_stamp = 0; p->node_stamp = 0;
p->numa_scan_seq = mm ? mm->numa_scan_seq : 0; p->numa_scan_seq = mm ? mm->numa_scan_seq : 0;
p->numa_scan_period = sysctl_numa_balancing_scan_delay; p->numa_scan_period = sysctl_numa_balancing_scan_delay;
/* Protect against double add, see task_tick_numa and task_numa_work */
p->numa_work.next = &p->numa_work; p->numa_work.next = &p->numa_work;
p->numa_faults = NULL; p->numa_faults = NULL;
RCU_INIT_POINTER(p->numa_group, NULL); RCU_INIT_POINTER(p->numa_group, NULL);
p->last_task_numa_placement = 0; p->last_task_numa_placement = 0;
p->last_sum_exec_runtime = 0; p->last_sum_exec_runtime = 0;
init_task_work(&p->numa_work, task_numa_work);
/* New address space, reset the preferred nid */ /* New address space, reset the preferred nid */
if (!(clone_flags & CLONE_VM)) { if (!(clone_flags & CLONE_VM)) {
p->numa_preferred_nid = NUMA_NO_NODE; p->numa_preferred_nid = NUMA_NO_NODE;
...@@ -2693,10 +2696,8 @@ static void task_tick_numa(struct rq *rq, struct task_struct *curr) ...@@ -2693,10 +2696,8 @@ static void task_tick_numa(struct rq *rq, struct task_struct *curr)
curr->numa_scan_period = task_scan_start(curr); curr->numa_scan_period = task_scan_start(curr);
curr->node_stamp += period; curr->node_stamp += period;
if (!time_before(jiffies, curr->mm->numa_next_scan)) { if (!time_before(jiffies, curr->mm->numa_next_scan))
init_task_work(work, task_numa_work); /* TODO: move this into sched_fork() */
task_work_add(curr, work, true); task_work_add(curr, work, true);
}
} }
} }
......
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