linux-kernel - Re: Defrag in shrinkers

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Message-ID: <87y6fmmdak.fsf@basil.nowhere.org>
Date:	Fri, 14 May 2010 22:36:03 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	Pekka Enberg <penberg@...helsinki.fi>, npiggin@...e.de
Subject: Re: Defrag in shrinkers

Christoph Lameter <cl@...ux.com> writes:

> Would it also be possible to add some defragmentation logic when you
> revise the shrinkers? Here is a prototype patch that would allow you to
> determine the other objects sitting in the same page as a given object.
>
> With that I hope that you have enough information to determine if its
> worth to evict the other objects as well to reclaim the slab page.

I like the idea, it would be useful for the hwpoison code too,
when it tries to clean a page.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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