linux-kernel - Re: [patch] slub: allow stats to be cleared

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Message-ID: <4AD77DAD.4070004@cs.helsinki.fi>
Date:	Thu, 15 Oct 2009 22:53:17 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] slub: allow stats to be cleared

David Rientjes wrote:
> When collecting slub stats for particular workloads, it's necessary to
> collect each statistic for all caches before the job is even started
> because the counters are usually greater than zero just from boot and
> initialization.
> 
> This allows a statistic to be cleared on each cpu by writing '0' to its
> sysfs file.  This creates a baseline for statistics of interest before
> the workload is started.
> 
> Setting a statistic to a particular value is not supported, so all values
> written to these files other than '0' returns -EINVAL.
> 
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Applied, thanks!
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