linux-kernel - Re: SLUB: Support for statistics to help analyze allocator behavior

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Message-ID: <Pine.LNX.4.64.0802051355270.14665@schroedinger.engr.sgi.com>
Date:	Tue, 5 Feb 2008 13:58:06 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: SLUB: Support for statistics to help analyze allocator behavior

On Tue, 5 Feb 2008, Pekka Enberg wrote:

> > We could do that.... Any idea how to display that kind of information in a
> > meaningful way. Parameter conventions for slabinfo?
> 
> We could just print out one total summary and one summary for each CPU (and
> maybe show % of total allocations/fees. That way you can immediately spot if
> some CPUs are doing more allocations/freeing than others.

Ok that would work for small amounts of cpus. Note that we are moving 
to quad core, many standard enterprise servers already have 8 and will 
likely have 16 next year. Our machine can have thousands of processors 
(new "practical" limit is 4k cpus although we could reach 16k cpus 
easily). I was a bit scared to open that can of worms.

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