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

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Message-ID: <alpine.DEB.2.00.1110140856420.6411@router.home>
Date:	Fri, 14 Oct 2011 08:57:16 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Dimitri Sivanich <sivanich@....com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH] Reduce vm_stat cacheline contention in
 __vm_enough_memory

On Fri, 14 Oct 2011, Dimitri Sivanich wrote:

> Testing on a smaller machine with 46 writer threads in parallel (my original
> test used 120).
>
> Looks as though cache-aligning and padding the end of the vm_stat array
> results in a ~150 MB/sec speedup.  This is a nice improvement for only 46
> writer threads, though it's not the full ~250 MB/sec speedup I get from
> setting OVERCOMMIT_NEVER.

Add to this the increase in the deltas for the ZVCs and change the stat
interval to 10 sec?

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