linux-kernel - Re: [RFC][PATCH] Check write to slab memory which freed already using mudflap

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Message-ID: <84144f020907100310gec596cfo718631df2c7d9b46@mail.gmail.com>
Date:	Fri, 10 Jul 2009 13:10:11 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Nick Piggin <npiggin@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Janboe Ye <yuan-bo.ye@...orola.com>,
	linux-kernel@...r.kernel.org, vegard.nossum@...il.com,
	fche@...hat.com, cl@...ux-foundation.org
Subject: Re: [RFC][PATCH] Check write to slab memory which freed already using 
	mudflap

Hi David,

On Fri, Jul 10, 2009 at 1:03 PM, David Rientjes<rientjes@...gle.com> wrote:
> It's my opinion that slab is on its way out when there's no benchmark that
> shows it is superior by any significant amount.  If that happens (and if
> its successor is slub, slqb, or a yet to be implemented allocator), we can
> probably start a discussion on what's in and what's out at that time.

Performance matters a lot, but it's certainly not the only priority
here. Look at slab, it's bootstrap code is a train-wreck which bit us
in the ass when we did the earlyslab thing and the NUMA support is
pretty horrible. The code base hasn't received much attention for the
past few years so unless someone steps up to clean it all, it's on
it's way out, like it or not.

So if you care about performance and have benchmarks that are _known_
to regress, you might want to focus your efforts on SLUB and/or SLQB
because that's where the action happens these days.

                        Pekka
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