linux-kernel - Re: SLUB: The unqueued Slab allocator

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Message-ID: <Pine.LNX.4.64.0702240931030.3912@schroedinger.engr.sgi.com>
Date:	Sat, 24 Feb 2007 09:32:49 -0800 (PST)
From:	Christoph Lameter <clameter@...r.sgi.com>
To:	David Miller <davem@...emloft.net>
cc:	kamezawa.hiroyu@...fujitsu.com, andi@...stfloor.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: SLUB: The unqueued Slab allocator

On Fri, 23 Feb 2007, David Miller wrote:

> > The general caches already merge lots of users depending on their sizes. 
> > So we already have the situation and we have tools to deal with it.
> 
> But this doesn't happen for things like biovecs, and that will
> make debugging painful.
> 
> If a crash happens because of a corrupted biovec-256 I want to know
> it was a biovec not some anonymous clone of kmalloc256.
> 
> Please provide at a minimum a way to turn the merging off.

Ok. Its currently a compile time option. Will make it possible to specify 
a boot option.
 
> I also agree with Andi in that merging could mess up how object type
> local lifetimes help reduce fragmentation in object pools.

If that is a problem for particular object pools then we may be able to 
except those from the merging.

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