linux-kernel - Re: [PATCH tip/core/timers 4/4] timers: Reduce future __run_timers() latency for first add to empty list

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Message-ID: <20140116023328.GS10038@linux.vnet.ibm.com>
Date:	Wed, 15 Jan 2014 18:33:28 -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 4/4] timers: Reduce future
	__run_timers() latency for first add to empty list

On Wed, Jan 15, 2014 at 06:24:09PM +0100, Oleg Nesterov wrote:
> On 01/14, Paul E. McKenney wrote:
> >
> > @@ -749,6 +749,7 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
> >
> >  	base = lock_timer_base(timer, &flags);
> >
> > +	(void)catchup_timer_jiffies(base);
> 
> Agreed, but perhaps it would be better to do this before
> all_timers++ in internal_add_timer() ?

Excellent point, changed.

> This is funny, but I already have the same change for ->next_timer,
> if we add this optimization perhaps that trivial patch makes sense
> too.

Yep, I queued your change in my series as well, thank you!

							Thanx, Paul

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