linux-kernel - Re: lockdep complaints in slab allocator

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Message-ID: <1259190407.2858.61.camel@calx>
Date:	Wed, 25 Nov 2009 17:06:47 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>
Subject: Re: lockdep complaints in slab allocator

On Wed, 2009-11-25 at 13:59 -0800, David Rientjes wrote:
> On Tue, 24 Nov 2009, Matt Mackall wrote:
> 
> > I'm afraid I have only anecdotal reports from SLOB users, and embedded
> > folks are notorious for lack of feedback, but I only need a few people
> > to tell me they're shipping 100k units/mo to be confident that SLOB is
> > in use in millions of devices.
> > 
> 
> It's much more popular than I had expected; do you think it would be 
> possible to merge slob's core into another allocator or will it require 
> seperation forever?

Probably not. It's actually a completely different kind of allocator
than the rest as it doesn't actually use "slabs" at all. It's instead a
slab-like interface on a traditional heap allocator. SLAB/SLUB/SLQB have
much more in common - their biggest differences are about their approach
to scalability/locking issues.

On the upside, SLOB is easily the simplest of the bunch.

-- 
http://selenic.com : development and support for Mercurial and Linux


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