Commit-ID: b34920d4ce6e6fc9424c20a4be98676eb543122f
Gitweb: https://git.kernel.org/tip/b34920d4ce6e6fc9424c20a4be98676eb543122f
Author: Valentin Schneider <valentin.schneider@xxxxxxx>
AuthorDate: Mon, 15 Jul 2019 11:25:07 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 25 Jul 2019 15:51:51 +0200
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: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Valentin Schneider <valentin.schneider@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: mgorman@xxxxxxx
Cc: riel@xxxxxxxxxxx
Link: https://lkml.kernel.org/r/20190715102508.32434-3-valentin.schneider@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/fair.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f0c488015649..fd391fc00ed8 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2495,7 +2495,7 @@ void task_numa_work(struct callback_head *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.
*
@@ -2639,12 +2639,15 @@ void init_numa_balancing(unsigned long clone_flags, struct task_struct *p)
p->node_stamp = 0;
p->numa_scan_seq = mm ? mm->numa_scan_seq : 0;
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_faults = NULL;
RCU_INIT_POINTER(p->numa_group, NULL);
p->last_task_numa_placement = 0;
p->last_sum_exec_runtime = 0;
+ init_task_work(&p->numa_work, task_numa_work);
+
/* New address space, reset the preferred nid */
if (!(clone_flags & CLONE_VM)) {
p->numa_preferred_nid = NUMA_NO_NODE;
@@ -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->node_stamp += period;
- if (!time_before(jiffies, curr->mm->numa_next_scan)) {
- init_task_work(work, task_numa_work); /* TODO: move this into sched_fork() */
+ if (!time_before(jiffies, curr->mm->numa_next_scan))
task_work_add(curr, work, true);
- }
}
}
|