Commit 3cf1962c authored Feb 18, 2014 by Rik van Riel Committed by Thomas Gleixner Feb 21, 2014

sched,numa: add cond_resched to task_numa_work

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.

Cc: akpm@linux-foundation.org
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Xing Gang <gang.xing@hp.com>
Tested-by: Chegu Vinod <chegu_vinod@hp.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1392761566-24834-2-git-send-email-riel@redhat.com

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent 49516342

kernel/sched/fair.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}

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