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mm: numa: Add fault driven placement and migration

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NOTE: This patch is based on "sched, numa, mm: Add fault driven
	placement and migration policy" but as it throws away all the policy
	to just leave a basic foundation I had to drop the signed-offs-by.

This patch creates a bare-bones method for setting PTEs pte_numa in the
context of the scheduler that when faulted later will be faulted onto the
node the CPU is running on.  In itself this does nothing useful but any
placement policy will fundamentally depend on receiving hints on placement
from fault context and doing something intelligent about it.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
This commit is contained in:
Peter Zijlstra 2012-10-25 14:16:43 +02:00 • committed by Mel Gorman
parent a720094ded
commit cbee9f88ec
11 changed files with 224 additions and 4 deletions
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13
kernel/sched/core.c
View file

@ -1533,6 +1533,19 @@ static void __sched_fork(struct task_struct *p)
#ifdef CONFIG_PREEMPT_NOTIFIERS
INIT_HLIST_HEAD(&p->preempt_notifiers);
#endif
#ifdef CONFIG_NUMA_BALANCING
if (p->mm && atomic_read(&p->mm->mm_users) == 1) {
p->mm->numa_next_scan = jiffies;
p->mm->numa_scan_seq = 0;
}
p->node_stamp = 0ULL;
p->numa_scan_seq = p->mm ? p->mm->numa_scan_seq : 0;
p->numa_migrate_seq = p->mm ? p->mm->numa_scan_seq - 1 : 0;
p->numa_scan_period = sysctl_numa_balancing_scan_period_min;
p->numa_work.next = &p->numa_work;
#endif /* CONFIG_NUMA_BALANCING */
}
/*