linux-kernel - Re: [PATCH] Reduce vm_stat cacheline contention in __vm_enough

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Message-ID: <alpine.DEB.2.00.1110130914480.16230@router.home>
Date:	Thu, 13 Oct 2011 09:15:39 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dimitri Sivanich <sivanich@....com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	ak@...ux.intel.com
Subject: Re: [PATCH] Reduce vm_stat cacheline contention in
 __vm_enough_memory

On Wed, 12 Oct 2011, Tim Chen wrote:

> Yeah, we have had this discussion on vm_enough_memory before.
>
> https://lkml.org/lkml/2011/1/26/473
>
> The current version of per cpu counter was not really suitable because
> the batch size is not appropriate.  I've tried to use per cpu counter
> with batch size adjusted in my attempt.  Andrew has suggested having an
> elastic batch size that's proportional to the size of the central
> counter but I haven't gotten around to try that out.

These counter are already managed as a ZVC counter. It may be easiest to
adjust the batching parameters for those to solve this issue.
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