forked from luck/tmp_suning_uos_patched
sched/fair: Better document newidle_balance()
Whilst chasing the pick_next_task() race, there was some confusion about the newidle_balance() return values. Document them. [ mingo: Minor edits. ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: bsegall@google.com Cc: dietmar.eggemann@arm.com Cc: juri.lelli@redhat.com Cc: ktkhai@virtuozzo.com Cc: mgorman@suse.de Cc: qais.yousef@arm.com Cc: qperret@google.com Cc: rostedt@goodmis.org Cc: valentin.schneider@arm.com Cc: vincent.guittot@linaro.org Link: https://lkml.kernel.org/r/20191108131909.488364308@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -9941,6 +9941,11 @@ static inline void nohz_newidle_balance(struct rq *this_rq) { }
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/*
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* idle_balance is called by schedule() if this_cpu is about to become
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* idle. Attempts to pull tasks from other CPUs.
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*
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* Returns:
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* < 0 - we released the lock and there are !fair tasks present
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* 0 - failed, no new tasks
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* > 0 - success, new (fair) tasks present
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*/
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int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
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{
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