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Message-Id: <1392761566-24834-2-git-send-email-riel@redhat.com> Date: Tue, 18 Feb 2014 17:12:44 -0500 From: riel@...hat.com To: linux-kernel@...r.kernel.org Cc: kvm@...r.kernel.org, linux-mm@...ck.org, peterz@...radead.org, chegu_vinod@...com, aarcange@...hat.com, akpm@...ux-foundation.org Subject: [PATCH -mm 1/3] sched,numa: add cond_resched to task_numa_work From: Rik van Riel <riel@...hat.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@...hat.com> Cc: Peter Zijlstra <peterz@...radead.org> Cc: Andrea Arcangeli <aarcange@...hat.com> Reported-by: Xing Gang <gang.xing@...com> Tested-by: Chegu Vinod <chegu_vinod@...com> --- kernel/sched/fair.c | 2 ++ 1 file changed, 2 insertions(+) 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); } -- 1.8.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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