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sched/pelt: Fix update of blocked PELT ordering

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update_cfs_rq_load_avg() can call cpufreq_update_util() to trigger an
update of the frequency. Make sure that RT, DL and IRQ PELT signals have
been updated before calling cpufreq.

Signed-off-by: Vincent Guittot <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Fixes: 371bf42732 ("sched/rt: Add rt_rq utilization tracking")
Fixes: 3727e0e163 ("sched/dl: Add dl_rq utilization tracking")
Fixes: 91c27493e7 ("sched/irq: Add IRQ utilization tracking")
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Vincent Guittot 2019-10-30 12:18:29 +01:00 • committed by Ingo Molnar
commit b90f7c9d21
1 changed files with 20 additions and 9 deletions
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29
kernel/sched/fair.c
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@ -7547,6 +7547,19 @@ static void update_blocked_averages(int cpu)
rq_lock_irqsave(rq, &rf);
update_rq_clock(rq);
/*
* update_cfs_rq_load_avg() can call cpufreq_update_util(). Make sure
* that RT, DL and IRQ signals have been updated before updating CFS.
*/
curr_class = rq->curr->sched_class;
update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class);
update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class);
update_irq_load_avg(rq, 0);
/* Don't need periodic decay once load/util_avg are null */
if (others_have_blocked(rq))
done = false;
/*
* Iterates the task_group tree in a bottom up fashion, see
* list_add_leaf_cfs_rq() for details.
@ -7574,14 +7587,6 @@ static void update_blocked_averages(int cpu)
done = false;
}
curr_class = rq->curr->sched_class;
update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class);
update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class);
update_irq_load_avg(rq, 0);
/* Don't need periodic decay once load/util_avg are null */
if (others_have_blocked(rq))
done = false;
update_blocked_load_status(rq, !done);
rq_unlock_irqrestore(rq, &rf);
}
@ -7642,12 +7647,18 @@ static inline void update_blocked_averages(int cpu)
rq_lock_irqsave(rq, &rf);
update_rq_clock(rq);
update_cfs_rq_load_avg(cfs_rq_clock_pelt(cfs_rq), cfs_rq);
/*
* update_cfs_rq_load_avg() can call cpufreq_update_util(). Make sure
* that RT, DL and IRQ signals have been updated before updating CFS.
*/
curr_class = rq->curr->sched_class;
update_rt_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &rt_sched_class);
update_dl_rq_load_avg(rq_clock_pelt(rq), rq, curr_class == &dl_sched_class);
update_irq_load_avg(rq, 0);
update_cfs_rq_load_avg(cfs_rq_clock_pelt(cfs_rq), cfs_rq);
update_blocked_load_status(rq, cfs_rq_has_blocked(cfs_rq) || others_have_blocked(rq));
rq_unlock_irqrestore(rq, &rf);
}