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sched/balancing: Update run_rebalance_domains() comments
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
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@ -12409,9 +12409,12 @@ static int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
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}
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/*
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* This softirq may be triggered from the scheduler tick, or by
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* any of the flags in NOHZ_KICK_MASK: NOHZ_BALANCE_KICK,
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* NOHZ_STATS_KICK or NOHZ_NEXT_KICK.
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* This softirq handler is triggered via SCHED_SOFTIRQ from two places:
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*
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* - directly from the local scheduler_tick() for periodic load balancing
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*
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* - indirectly from a remote scheduler_tick() for NOHZ idle balancing
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* through the SMP cross-call nohz_csd_func()
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*/
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static __latent_entropy void run_rebalance_domains(struct softirq_action *h)
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{
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