linux-kernel - Re: Slab Fragmentation Reduction V15

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Message-ID: <4B6447EC.7030702@redhat.com>
Date:	Sat, 30 Jan 2010 09:53:32 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Christoph Lameter <cl@...ux-foundation.org>,
	Dave Chinner <david@...morbit.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	akpm@...ux-foundation.org, Miklos Szeredi <miklos@...redi.hu>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org,
	viro@...IV.linux.org.uk
Subject: Re: Slab Fragmentation Reduction V15

On 01/30/2010 05:48 AM, Andi Kleen wrote:
> On Fri, Jan 29, 2010 at 02:49:31PM -0600, Christoph Lameter wrote:

>> 	1. Establish a reference to an dentry/inode so that it is pinned.
>>             Hopefully in a way that is not too expensive (i.e. no superblock
>>             lock)
>>
>> 	2. A means to free a dentry/inode objects from the VM reclaim context.
>
>
> Al, do you have a suggestions on a good way to do that?

You cannot free inode objects for files that are open, mmapped, etc.

> I guess the problem could be simplified by ignoring dentries in "unusual"
> states?

You mean dentries that are in use? :)

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