From: Vincent Guittot <vincent.guittot@linaro.org>
To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de, fweisbec@gmail.com,
tglx@linutronix.de, bristot@redhat.com,
linux-kernel@vger.kernel.org, joel@joelfernandes.org
Cc: qais.yousef@arm.com, Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH 6/6] sched/fair: reduce the window for duplicated update
Date: Fri, 5 Feb 2021 12:48:30 +0100 [thread overview]
Message-ID: <20210205114830.781-7-vincent.guittot@linaro.org> (raw)
In-Reply-To: <20210205114830.781-1-vincent.guittot@linaro.org>
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>
---
kernel/sched/fair.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3d2ab28d5736..968808c2c022 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7852,17 +7852,9 @@ static inline bool others_have_blocked(struct rq *rq)
return false;
}
-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_status(struct rq *rq, bool has_blocked) {}
#endif
static bool __update_blocked_others(struct rq *rq, bool *done)
@@ -8022,12 +8014,16 @@ static void update_blocked_averages(int cpu)
struct rq_flags rf;
rq_lock_irqsave(rq, &rf);
+ WRITE_ONCE(rq->last_blocked_load_update_tick, jiffies);
+
update_rq_clock(rq);
decayed |= __update_blocked_others(rq, &done);
decayed |= __update_blocked_fair(rq, &done);
- update_blocked_load_status(rq, !done);
+ if (done)
+ rq->has_blocked_load = 0;
+
if (decayed)
cpufreq_update_util(rq, 0);
rq_unlock_irqrestore(rq, &rf);
@@ -8363,7 +8359,7 @@ 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);
--
2.17.1
next prev parent reply other threads:[~2021-02-05 11:52 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-05 11:48 [PATCH 0/6] move update blocked load outside newidle_balance Vincent Guittot
2021-02-05 11:48 ` [PATCH 1/6] sched/fair: remove update of blocked load from newidle_balance Vincent Guittot
2021-02-09 13:09 ` Valentin Schneider
2021-02-09 13:20 ` Vincent Guittot
2021-02-09 13:44 ` Dietmar Eggemann
2021-02-05 11:48 ` [PATCH 2/6] sched/fair: remove unused parameter of update_nohz_stats Vincent Guittot
2021-02-09 13:45 ` Dietmar Eggemann
2021-02-09 17:38 ` Vincent Guittot
2021-02-05 11:48 ` [PATCH 3/6] sched/fair: merge for each idle cpu loop of ILB Vincent Guittot
2021-02-09 13:09 ` Valentin Schneider
2021-02-05 11:48 ` [PATCH 4/6] sched/fair: reorder newidle_balance pulled_task test Vincent Guittot
2021-02-09 13:46 ` Dietmar Eggemann
2021-02-05 11:48 ` [RFC PATCH 5/6] sched/fair: trigger the update of blocked load on newly idle cpu Vincent Guittot
2021-02-09 13:09 ` Valentin Schneider
2021-02-09 13:57 ` Vincent Guittot
2021-02-09 17:25 ` Valentin Schneider
2021-02-09 13:47 ` Dietmar Eggemann
2021-02-09 14:22 ` Vincent Guittot
2021-02-05 11:48 ` Vincent Guittot [this message]
2021-02-05 16:13 ` [PATCH 6/6 v2] sched/fair: reduce the window for duplicated update Vincent Guittot
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