On Thu, Apr 24, 2014 at 08:45:58PM +0200, Denys Vlasenko wrote:
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 268a45e..ffea757 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4218,7 +4218,14 @@ void __sched io_schedule(void)
> current->in_iowait = 1;
> schedule();
> current->in_iowait = 0;
> +#ifdef CONFIG_NO_HZ_COMMON
> + if (atomic_dec_and_test(&rq->nr_iowait)) {
> + if (raw_smp_processor_id() != cpu_of(rq))
> + tick_nohz_iowait_to_idle(cpu_of(rq));
> + }
> +#else
> atomic_dec(&rq->nr_iowait);
> +#endif
> delayacct_blkio_end();
> }
You're really refusing to collapse that stuff eh? Maybe I should just
redirect this entire iowait fest to /dev/null :/
> +void tick_nohz_iowait_to_idle(int cpu)
> +{
> + struct tick_sched *ts = tick_get_tick_sched(cpu);
> + ktime_t now = ktime_get();
> +
> + write_seqcount_begin(&ts->idle_sleeptime_seq);
> + ts->iowait_exittime = now;
> + write_seqcount_end(&ts->idle_sleeptime_seq);
> +}
So what again was wrong with this one?
http://marc.info/?l=linux-kernel&m=139772917211023
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