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| author | Peter Boonstoppel <pboonstoppel@nvidia.com> | 2012-08-09 15:34:47 -0700 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2014-02-15 19:20:18 +0000 |
| commit | 4553dab7f3e57b70fee61739325b6ff7bb56ac9b (patch) | |
| tree | 3f9255343b491e04889c9711ce262872bbed84c1 /kernel/sched_fair.c | |
| parent | aee1f8b87e203b0525f340d2fde94f5a82f6c4bd (diff) | |
| download | kernel_samsung_smdk4412-4553dab7f3e57b70fee61739325b6ff7bb56ac9b.zip kernel_samsung_smdk4412-4553dab7f3e57b70fee61739325b6ff7bb56ac9b.tar.gz kernel_samsung_smdk4412-4553dab7f3e57b70fee61739325b6ff7bb56ac9b.tar.bz2 | |
sched: Unthrottle rt runqueues in __disable_runtime()
commit a4c96ae319b8047f62dedbe1eac79e321c185749 upstream.
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>
[ lizf: backported to 3.4: adjust context ]
Signed-off-by: Li Zefan <lizefan@huawei.com>
[bwh: Backported to 3.2:
- Adjust filenames
- unthrottle_offline_cfs_rqs() is already static, but defined in sched.c
after including sched_fair.c, so add forward declaration
- unthrottle_offline_cfs_rqs() also needs to be defined for all CONFIG_SMP
configurations now]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 5b9e456..37f3f39 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -4848,6 +4848,9 @@ static void rq_online_fair(struct rq *rq) static void rq_offline_fair(struct rq *rq) { update_sysctl(); + + /* Ensure any throttled groups are reachable by pick_next_task */ + unthrottle_offline_cfs_rqs(rq); } #else /* CONFIG_SMP */ |