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| author | Peter Zijlstra <peterz@infradead.org> | 2011-10-18 22:03:48 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2012-03-01 10:28:01 +0100 |
| commit | 42c62a589f1ccbf38a02cb732231f9c2fccc5ab0 (patch) | |
| tree | 80ba018cd3b581668f9c8dc75d52f9c2a9ee9f54 /kernel/sched | |
| parent | 7e4d960993331e92567f0180e45322a93e6780ba (diff) | |
| download | linux-42c62a589f1ccbf38a02cb732231f9c2fccc5ab0.tar.gz linux-42c62a589f1ccbf38a02cb732231f9c2fccc5ab0.tar.bz2 linux-42c62a589f1ccbf38a02cb732231f9c2fccc5ab0.zip | |
sched/rt: Keep period timer ticking when rt throttling is active
When a runqueue is throttled we cannot disable the period timer
because that timer is the only way to undo the throttling.
We got stale throttling entries when a rq was throttled and then the
global sysctl was disabled, which stopped the timer.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
[ Added changelog ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/n/tip-nuj34q52p6ro7szapuz84i0v@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/rt.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index f70206c2c802..6d1eb0be1870 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -778,12 +778,9 @@ static inline int balance_runtime(struct rt_rq *rt_rq) static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun) { - int i, idle = 1; + int i, idle = 1, throttled = 0; const struct cpumask *span; - if (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF) - return 1; - span = sched_rt_period_mask(); for_each_cpu(i, span) { int enqueue = 0; @@ -818,12 +815,17 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun) if (!rt_rq_throttled(rt_rq)) enqueue = 1; } + if (rt_rq->rt_throttled) + throttled = 1; if (enqueue) sched_rt_rq_enqueue(rt_rq); raw_spin_unlock(&rq->lock); } + if (!throttled && (!rt_bandwidth_enabled() || rt_b->rt_runtime == RUNTIME_INF)) + return 1; + return idle; } @@ -884,7 +886,8 @@ static void update_curr_rt(struct rq *rq) if (unlikely((s64)delta_exec < 0)) delta_exec = 0; - schedstat_set(curr->se.statistics.exec_max, max(curr->se.statistics.exec_max, delta_exec)); + schedstat_set(curr->se.statistics.exec_max, + max(curr->se.statistics.exec_max, delta_exec)); curr->se.sum_exec_runtime += delta_exec; account_group_exec_runtime(curr, delta_exec); |