linux-kernel - Re: 2.6.22 -mm merge plans: slub

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Message-ID: <20070502195412.GC9044@uranus.ravnborg.org>
Date:	Wed, 2 May 2007 21:54:12 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: 2.6.22 -mm merge plans: slub

On Wed, May 02, 2007 at 12:42:54PM -0700, Christoph Lameter wrote:
> On Wed, 2 May 2007, Andrew Morton wrote:
> 
> > > At some point I dream that SLUB could become the default but I thought 
> > > this would take at least 6 month or so. If want to force this now then I 
> > > will certainly have some busy weeks ahead.
> > 
> > s/dream/promise/ ;)
> > 
> > Six months sounds reasonable - I was kind of hoping for less.  Make it
> > default-to-on in 2.6.23-rc1, see how it goes.
> 
> Here is how I think the future could develop
> 
> Cycle	SLAB		SLUB		SLOB		SLxB
> 
> 2.6.22	API fixes	Stabilization	API fixes
> 
> Major event: SLUB availability as experimental
> 
> 2.6.23	API upgrades	Perf. Valid.	EOL
> 
> Major events: SLUB performance validation. Switch off
> 	experimental (could even be the default) 
> 	Slab allocators support targeted reclaim for at
> 	least one slab cache (dentry?)
> 	(vacate/move all objects in a slab)

To facilitate this do NOT introduce CONFIG_SLAB until we decide
that SLUB are default. In this way we can make CONFIG_SLUB be default
and people will not continue with CONFIG_SLAB because they had it in their
.config already.
Or just rename CONFIG_SLAB to CONFIG_SLAB_DEPRECATED or something.

The point is make sure that LSUB becomes default for people that does
an make oldconfig (explicit or implicit).

	Sam
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