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: <20140115172409.GD11499@redhat.com>
Date:	Wed, 15 Jan 2014 18:24:09 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.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 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() ?

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.

Oleg.

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