linux-kernel - Re: lockdep complaints in slab allocator

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Message-ID: <20091124214814.GK6831@linux.vnet.ibm.com>
Date:	Tue, 24 Nov 2009 13:48:14 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Matt Mackall <mpm@...enic.com>,
	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: lockdep complaints in slab allocator

On Tue, Nov 24, 2009 at 10:12:30PM +0100, Peter Zijlstra wrote:
> On Tue, 2009-11-24 at 13:03 -0800, David Rientjes wrote:
> > On Tue, 24 Nov 2009, Peter Zijlstra wrote:
> > 
> > > Merge SLQB and rm mm/sl[ua]b.c include/linux/sl[ua]b.h for .33-rc1
> > > 
> > 
> > slqb still has a 5-10% performance regression compared to slab for 
> > benchmarks such as netperf TCP_RR on machines with high cpu counts, 
> > forcing that type of regression isn't acceptable.
> 
> Having _4_ slab allocators is equally unacceptable.

I completely agree.  We need at least ten.  ;-)

							Thanx, Paul
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