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sched/fair: Reduce the window for duplicated update 

Start to update last_blocked_load_update_tick to reduce the possibility
of another cpu starting the update one more time

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210224133007.28644-8-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2021-02-24 14:30:07 +01:00 committed by Ingo Molnar
parent c6f886546c
commit 39b6a429c3
1 changed files with 8 additions and 3 deletions
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11
kernel/sched/fair.c
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@ -7852,16 +7852,20 @@ static inline bool others_have_blocked(struct rq *rq)
return false;
}
static inline void update_blocked_load_tick(struct rq *rq)
{
WRITE_ONCE(rq->last_blocked_load_update_tick, jiffies);
}
static inline void update_blocked_load_status(struct rq *rq, bool has_blocked)
{
rq->last_blocked_load_update_tick = jiffies;
if (!has_blocked)
rq->has_blocked_load = 0;
}
#else
static inline bool cfs_rq_has_blocked(struct cfs_rq *cfs_rq) { return false; }
static inline bool others_have_blocked(struct rq *rq) { return false; }
static inline void update_blocked_load_tick(struct rq *rq) {}
static inline void update_blocked_load_status(struct rq *rq, bool has_blocked) {}
#endif
@ -8022,6 +8026,7 @@ static void update_blocked_averages(int cpu)
struct rq_flags rf;
rq_lock_irqsave(rq, &rf);
update_blocked_load_tick(rq);
update_rq_clock(rq);
decayed |= __update_blocked_others(rq, &done);
@ -8363,7 +8368,7 @@ static bool update_nohz_stats(struct rq *rq)
if (!cpumask_test_cpu(cpu, nohz.idle_cpus_mask))
return false;
if (!time_after(jiffies, rq->last_blocked_load_update_tick))
if (!time_after(jiffies, READ_ONCE(rq->last_blocked_load_update_tick)))
return true;
update_blocked_averages(cpu);