linux-kernel - Re: [RFC V2 SLEB 00/14] The Enhanced(hopefully) Slab Allocator

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Message-ID: <20100525174045.GI20853@laptop>
Date:	Wed, 26 May 2010 03:40:45 +1000
From:	Nick Piggin <npiggin@...e.de>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Matt Mackall <mpm@...enic.com>, Mel Gorman <mel@....ul.ie>
Subject: Re: [RFC V2 SLEB 00/14] The Enhanced(hopefully) Slab Allocator

On Tue, May 25, 2010 at 08:35:05PM +0300, Pekka Enberg wrote:
> On Tue, May 25, 2010 at 8:19 PM, Nick Piggin <npiggin@...e.de> wrote:
> >> I'm not totally convinced but I guess we're about to find that out.
> >> How do you propose we benchmark SLAB while we clean it up
> >
> > Well the first pass will be code cleanups, bootstrap simplifications.
> > Then looking at what debugging features were implemented in SLUB but not
> > SLAB and what will be useful to bring over from there.
> 
> Bootstrap might be easy to clean up but the biggest source of cruft
> comes from the deeply inlined, complex allocation paths. Cleaning
> those up is bound to cause performance regressions if you're not
> careful.

Oh I see what you mean, just straight-line code speed regressions
could bite us when doing cleanups.

That's possible. I'll keep a close eye on generated asm.

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