sched/numa: Initialise numa_next_scan properly
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>
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@ -1624,8 +1624,8 @@ static void __sched_fork(struct task_struct *p)
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#ifdef CONFIG_NUMA_BALANCING
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#ifdef CONFIG_NUMA_BALANCING
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if (p->mm && atomic_read(&p->mm->mm_users) == 1) {
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if (p->mm && atomic_read(&p->mm->mm_users) == 1) {
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p->mm->numa_next_scan = jiffies;
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p->mm->numa_next_scan = jiffies + msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
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p->mm->numa_next_reset = jiffies;
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p->mm->numa_next_reset = jiffies + msecs_to_jiffies(sysctl_numa_balancing_scan_period_reset);
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p->mm->numa_scan_seq = 0;
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p->mm->numa_scan_seq = 0;
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}
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}
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@ -900,6 +900,13 @@ void task_numa_work(struct callback_head *work)
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if (p->flags & PF_EXITING)
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if (p->flags & PF_EXITING)
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return;
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return;
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if (!mm->numa_next_reset || !mm->numa_next_scan) {
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mm->numa_next_scan = now +
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msecs_to_jiffies(sysctl_numa_balancing_scan_delay);
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mm->numa_next_reset = now +
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msecs_to_jiffies(sysctl_numa_balancing_scan_period_reset);
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}
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/*
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/*
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* Reset the scan period if enough time has gone by. Objective is that
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* Reset the scan period if enough time has gone by. Objective is that
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* scanning will be reduced if pages are properly placed. As tasks
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* scanning will be reduced if pages are properly placed. As tasks
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