linux-kernel - Re: [PATCH tip/core/timers 3/4] timers: Reduce future __run

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Message-ID: <20140116022332.GQ10038@linux.vnet.ibm.com>
Date:	Wed, 15 Jan 2014 18:23:32 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu
Subject: Re: [PATCH tip/core/timers 3/4] timers: Reduce future
	__run_timers() latency for newly emptied list

On Wed, Jan 15, 2014 at 06:08:35PM +0100, Oleg Nesterov wrote:
> On 01/14, Paul E. McKenney wrote:
> >
> > @@ -700,6 +700,7 @@ static int detach_if_pending(struct timer_list *timer, struct tvec_base *base,
> >  			base->next_timer = base->timer_jiffies;
> >  	}
> >  	base->all_timers--;
> > +	(void)catchup_timer_jiffies(base);
> 
> Agreed, but I think that detach_expired_timer() should do the same,
> this can stop main loop in __run_timers().

Good point, added to detach_expired_timer().

							Thanx, Paul

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