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sched/balancing: Update run_rebalance_domains() comments

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The first sentence of the comment explaining run_rebalance_domains()
is historic and not true anymore:

    * run_rebalance_domains is triggered when needed from the scheduler tick.

... contradicted/modified by the second sentence:

    * Also triggered for NOHZ idle balancing (with NOHZ_BALANCE_KICK set).

Avoid that kind of confusion straight away and explain from what
places sched_balance_softirq() is triggered.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Acked-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lore.kernel.org/r/20240308105901.1096078-9-mingo@kernel.org
This commit is contained in:
Ingo Molnar
2024-03-08 11:58:59 +01:00
parent 3a5fe93057
commit 3dc6f6c8ef
1 changed files with 6 additions and 3 deletions
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9
kernel/sched/fair.c
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@@ -12409,9 +12409,12 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
}
/*
* This softirq may be triggered from the scheduler tick, or by
* any of the flags in NOHZ_KICK_MASK: NOHZ_BALANCE_KICK,
* NOHZ_STATS_KICK or NOHZ_NEXT_KICK.
* This softirq handler is triggered via SCHED_SOFTIRQ from two places:
*
* - directly from the local scheduler_tick() for periodic load balancing
*
* - indirectly from a remote scheduler_tick() for NOHZ idle balancing
* through the SMP cross-call nohz_csd_func()
*/
static __latent_entropy void run_rebalance_domains(struct softirq_action *h)
{