linux-kernel - Re: [PATCH] slab: use deferable timers for its periodic housekeeping

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Message-ID: <4C454A8D.9060102@cs.helsinki.fi>
Date:	Tue, 20 Jul 2010 10:04:45 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Arjan van de Ven <arjan@...ux.intel.com>,
	David Rientjes <rientjes@...gle.com>,
	Nick Piggin <npiggin@...e.de>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	cl@...ux-foundation.org
Subject: Re: [PATCH] slab: use deferable timers for its periodic housekeeping

Arjan van de Ven wrote:
> From: Arjan van de Ven <arjan@...ux.intel.com>
> Subject: [PATCH] slab: use deferable timers for its periodic housekeeping
> 
> slab has a "once every 2 second" timer for its housekeeping.
> As the number of logical processors is growing, its more and more
> common that this 2 second timer becomes the primary wakeup source.
> 
> This patch turns this housekeeping timer into a deferable timer,
> which means that the timer does not interrupt idle, but just runs
> at the next event that wakes the cpu up.
> 
> The impact is that the timer likely runs a bit later, but during the
> delay no code is running so there's not all that much reason for
> a difference in housekeeping to occur because of this delay.
> 
> Signed-off-by: Arjan van de Ven <arjan@...ux.intel.com>
> ---
>  mm/slab.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/slab.c b/mm/slab.c
> index 7451bda..ef3cd3d 100644
> --- a/mm/slab.c
> +++ b/mm/slab.c
> @@ -884,7 +884,7 @@ static void __cpuinit start_cpu_timer(int cpu)
>       */
>      if (keventd_up() && reap_work->work.func == NULL) {
>          init_reap_node(cpu);
> -        INIT_DELAYED_WORK(reap_work, cache_reap);
> +        INIT_DELAYED_WORK_DEFERRABLE(reap_work, cache_reap);
>          schedule_delayed_work_on(cpu, reap_work,
>                      __round_jiffies_relative(HZ, cpu));
>      }

[ The patch seems to have been whitespace damaged. ]

Applied, thanks!
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