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sched: Unthrottle rt runqueues in __disable_runtime()

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migrate_tasks() uses _pick_next_task_rt() to get tasks from the
real-time runqueues to be migrated. When rt_rq is throttled
_pick_next_task_rt() won't return anything, in which case
migrate_tasks() can't move all threads over and gets stuck in an
infinite loop.

Instead unthrottle rt runqueues before migrating tasks.

Additionally: move unthrottle_offline_cfs_rqs() to rq_offline_fair()

Signed-off-by: Peter Boonstoppel <pboonstoppel@nvidia.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Turner <pjt@google.com>
Link: http://lkml.kernel.org/r/5FBF8E85CA34454794F0F7ECBA79798F379D3648B7@HQMAIL04.nvidia.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Boonstoppel
2012-08-09 15:34:47 -07:00
committed by Ingo Molnar
parent 749c8814f0
commit a4c96ae319
4 changed files with 6 additions and 6 deletions
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3
kernel/sched/core.c
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@@ -5342,9 +5342,6 @@ static void migrate_tasks(unsigned int dead_cpu)
*/
rq->stop = NULL;
/* Ensure any throttled groups are reachable by pick_next_task */
unthrottle_offline_cfs_rqs(rq);
for ( ; ; ) {
/*
* There's this thread running, bail when that's the only