Commit d07387b4 authored Jul 10, 2009 by Paul Turner Committed by Ingo Molnar Jul 11, 2009

sched: Fix bug in SCHED_IDLE interaction with group scheduling



One of the isolation modifications for SCHED_IDLE is the
unitization of sleeper credit.  However the check for this
assumes that the sched_entity we're placing always belongs to a
task.

This is potentially not true with group scheduling and leaves
us rummaging randomly when we try to pull the policy.

Signed-off-by: Paul Turner <pjt@google.com>
Cc: peterz@infradead.org
LKML-Reference: <alpine.DEB.1.00.0907101649570.29914@kitami.corp.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent c20b08e3

kernel/sched_fair.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -687,7 +687,8 @@ place_entity(struct cfs_rq cfs_rq, struct sched_entity se, int initial)
		* all of which have the same weight.
		*/
		if (sched_feat(NORMALIZED_SLEEPER) &&
		task_of(se)->policy != SCHED_IDLE)
		(!entity_is_task(se) \|\|
		task_of(se)->policy != SCHED_IDLE))
		thresh = calc_delta_fair(thresh, se);

		vruntime -= thresh;