Commit 638e13ac authored Oct 15, 2007 by Gautham R Shenoy Committed by Ingo Molnar Oct 15, 2007

sched: fix rt ptracer monopolizing CPU



yield() in wait_task_inactive(), can cause a high priority thread to be
scheduled back in, and there by loop forever while it is waiting for some
lower priority thread which is unfortunately still on the runqueue.

Use schedule_timeout_uninterruptible(1) instead.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Credit: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 5cb350ba

kernel/sched.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1133,7 +1133,7 @@ repeat:
		* yield - it could be a while.
		*/
		if (unlikely(on_rq)) {
		yield();
		schedule_timeout_uninterruptible(1);
		goto repeat;
		}

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