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Date: Wed, 7 Dec 2011 11:14:12 +0800 From: Yong Zhang <yong.zhang0@...il.com> To: Frederic Weisbecker <fweisbec@...il.com> Cc: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, Ingo Molnar <mingo@...e.hu> Subject: Re: [PATCH] nohz: Remove ts->inidle checks before restarting the tick On Tue, Dec 06, 2011 at 03:30:43PM +0100, Frederic Weisbecker wrote: > ts->inidle is set by tick_nohz_stop_sched_tick(1) and unset > by tick_nohz_restart_sched_tick(). These two calls are assumed > to be always paired. This means that by the time we call > tick_nohz_restart_sched_tick(), ts->inidle is supposed to > be always set to 1. > > Remove the checks for ts->inidle in tick_nohz_restart_sched_tick(). > This simplifies a bit the code and improves its debuggability > (ie: ensure the call is paired with a tick_nohz_stop_sched_tick() call). > > Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> Reviewed-by: Yong Zhang <yong.zhang0@...il.com> Thanks, Yong > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl> > Cc: Ingo Molnar <mingo@...e.hu> > --- > kernel/time/tick-sched.c | 12 +++++++----- > 1 files changed, 7 insertions(+), 5 deletions(-) > > diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c > index 4042064..0f7c5e5 100644 > --- a/kernel/time/tick-sched.c > +++ b/kernel/time/tick-sched.c > @@ -529,20 +529,22 @@ void tick_nohz_restart_sched_tick(void) > ktime_t now; > > local_irq_disable(); > - if (ts->idle_active || (ts->inidle && ts->tick_stopped)) > + > + WARN_ON_ONCE(!ts->inidle); > + > + ts->inidle = 0; > + > + if (ts->idle_active || ts->tick_stopped) > now = ktime_get(); > > if (ts->idle_active) > tick_nohz_stop_idle(cpu, now); > > - if (!ts->inidle || !ts->tick_stopped) { > - ts->inidle = 0; > + if (!ts->tick_stopped) { > local_irq_enable(); > return; > } > > - ts->inidle = 0; > - > rcu_exit_nohz(); > > /* Update jiffies first */ > -- > 1.7.5.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- Only stand for myself -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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