diff options
| author | Peter Boonstoppel <pboonstoppel@nvidia.com> | 2012-08-09 15:34:47 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-13 11:51:19 -0800 |
| commit | f61eb9ceb26cee3fdbb8c7a4920f171f7661fb4f (patch) | |
| tree | 7ef1b69d19fdc57f57ce58dc78988ce4a653aa8e /kernel | |
| parent | 1e5c13ec422f665432bfc9f7c5fc1f9fd614afd3 (diff) | |
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 3 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 7 | ||||
| -rw-r--r-- | kernel/sched/rt.c | 1 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 1 |
4 files changed, 6 insertions, 6 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3a5b31796ed..7522816cd7f 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5301,9 +5301,6 @@ 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 diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 363df3702c2..93be350c9b6 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2071,7 +2071,7 @@ static void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) hrtimer_cancel(&cfs_b->slack_timer); } -void unthrottle_offline_cfs_rqs(struct rq *rq) +static void unthrottle_offline_cfs_rqs(struct rq *rq) { struct cfs_rq *cfs_rq; @@ -2125,7 +2125,7 @@ static inline struct cfs_bandwidth *tg_cfs_bandwidth(struct task_group *tg) return NULL; } static inline void destroy_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {} -void unthrottle_offline_cfs_rqs(struct rq *rq) {} +static inline void unthrottle_offline_cfs_rqs(struct rq *rq) {} #endif /* CONFIG_CFS_BANDWIDTH */ @@ -5171,6 +5171,9 @@ 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); } #endif /* CONFIG_SMP */ diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index dd1c7e9d7fb..32a51c80812 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -685,6 +685,7 @@ balanced: * runtime - in which case borrowing doesn't make sense. */ rt_rq->rt_runtime = RUNTIME_INF; + rt_rq->rt_throttled = 0; raw_spin_unlock(&rt_rq->rt_runtime_lock); raw_spin_unlock(&rt_b->rt_runtime_lock); } diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 4e2bd6c32da..a70d8908a6d 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1138,7 +1138,6 @@ extern void print_rt_stats(struct seq_file *m, int cpu); extern void init_cfs_rq(struct cfs_rq *cfs_rq); extern void init_rt_rq(struct rt_rq *rt_rq, struct rq *rq); -extern void unthrottle_offline_cfs_rqs(struct rq *rq); extern void cfs_bandwidth_usage_inc(void); extern void cfs_bandwidth_usage_dec(void); |