Subject: Re: lockdep complaints in slab allocator
From: Peter Zijlstra <peterz@infradead.org>
To: Matt Mackall <mpm@selenic.com>
Cc: paulmck@linux.vnet.ibm.com, Pekka Enberg <penberg@cs.helsinki.fi>,
       linux-mm@kvack.org, cl@linux-foundation.org,
       LKML <linux-kernel@vger.kernel.org>, Nick Piggin <npiggin@suse.de>
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Date: Tue, 24 Nov 2009 21:46:20 +0100
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On Tue, 2009-11-24 at 13:23 -0600, Matt Mackall wrote:

> My understanding of the current state of play is:
> 
> SLUB: default allocator
> SLAB: deep maintenance, will be removed if SLUB ever covers remaining
> performance regressions
> SLOB: useful for low-end (but high-volume!) embedded 
> SLQB: sitting in slab.git#for-next for months, has some ground to cover
> 
> SLQB and SLUB have pretty similar target audiences, so I agree we should
> eventually have only one of them. But I strongly expect performance
> results to be mixed, just as they have been comparing SLUB/SLAB.
> Similarly, SLQB still has of room for tuning left compared to SLUB, as
> SLUB did compared to SLAB when it first emerged. It might be a while
> before a clear winner emerges.

And as long as we drag out this madness nothing will change I suspect.

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