Commit 3cf1962c authored by Rik van Riel's avatar Rik van Riel Committed by Thomas Gleixner

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: default avatarRik van Riel <riel@redhat.com>
Reported-by: default avatarXing Gang <gang.xing@hp.com>
Tested-by: default avatarChegu Vinod <chegu_vinod@hp.com>
Signed-off-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1392761566-24834-2-git-send-email-riel@redhat.comSigned-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 49516342
...@@ -1757,6 +1757,8 @@ void task_numa_work(struct callback_head *work) ...@@ -1757,6 +1757,8 @@ void task_numa_work(struct callback_head *work)
start = end; start = end;
if (pages <= 0) if (pages <= 0)
goto out; goto out;
cond_resched();
} while (end != vma->vm_end); } while (end != vma->vm_end);
} }
......
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