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[-mm,1/3] sched,numa: add cond_resched to task_numa_work

Message ID 1392761566-24834-2-git-send-email-riel@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Rik van Riel Feb. 18, 2014, 10:12 p.m. UTC
From: Rik van Riel <riel@redhat.com>

Normally task_numa_work scans over a fairly small amount of memory,
but it is possible to run into a large unpopulated part of virtual
memory, with no pages mapped. In that case, task_numa_work can run
for a while, and it may make sense to reschedule as required.

Signed-off-by: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Xing Gang <gang.xing@hp.com>
Tested-by: Chegu Vinod <chegu_vinod@hp.com>
 kernel/sched/fair.c | 2 ++
 1 file changed, 2 insertions(+)
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diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 966cc2b..7815709 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1757,6 +1757,8 @@  void task_numa_work(struct callback_head *work)
 			start = end;
 			if (pages <= 0)
 				goto out;
+			cond_resched();
 		} while (end != vma->vm_end);