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sched/numa: Initialise numa_next_scan properly

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Scan delay logic and resets are currently initialised to start scanning
immediately instead of delaying properly. Initialise them properly at
fork time and catch when a new mm has been allocated.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-17-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mel Gorman 2013-10-07 11:28:54 +01:00 • committed by Ingo Molnar
parent b726b7dfb4
commit 7e8d16b6cb
2 changed files with 9 additions and 2 deletions
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4
kernel/sched/core.c
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@ -1624,8 +1624,8 @@ static void __sched_fork(struct task_struct *p)
#ifdef CONFIG_NUMA_BALANCING #ifdef CONFIG_NUMA_BALANCING
if (p->mm && atomic_read(&p->mm->mm_users) == 1) { if (p->mm && atomic_read(&p->mm->mm_users) == 1) {
p->mm->numa_next_scan = jiffies; p->mm->numa_next_scan = jiffies + msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
p->mm->numa_next_reset = jiffies; p->mm->numa_next_reset = jiffies + msecs_to_jiffies(sysctl_numa_balancing_scan_period_reset);
p->mm->numa_scan_seq = 0; p->mm->numa_scan_seq = 0;
} }

7
kernel/sched/fair.c
View file

@ -900,6 +900,13 @@ void task_numa_work(struct callback_head *work)
if (p->flags & PF_EXITING) if (p->flags & PF_EXITING)
return; return;
if (!mm->numa_next_reset || !mm->numa_next_scan) {
mm->numa_next_scan = now +
msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
mm->numa_next_reset = now +
msecs_to_jiffies(sysctl_numa_balancing_scan_period_reset);
}
/* /*
* Reset the scan period if enough time has gone by. Objective is that * Reset the scan period if enough time has gone by. Objective is that
* scanning will be reduced if pages are properly placed. As tasks * scanning will be reduced if pages are properly placed. As tasks