linux-kernel - Re: [PATCH 2.6.28 1/2] memory: improve find

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Message-ID: <20090205194125.GA3129@elte.hu>
Date:	Thu, 5 Feb 2009 20:41:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Lowengrub <lowdanie@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.28 1/2] memory: improve find_vma


* Daniel Lowengrub <lowdanie@...il.com> wrote:

> On Sun, Feb 1, 2009 at 3:00 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >
> >  you should time it:
> >
> >  time ./mmap-perf
> >
> > and compare the before/after results.
> >
> >        Ingo
> >
> 
> I made a script that runs 'time ./mmap-perf' 100 times and outputs the
> average.  The output on the standard kernel was:
>
>  real: 1.022600
>  user: 0.135900
>  system: 0.852600
>
> The output after the patch was:
>
>  real: 0.815400
>  user: 0.113200
>  system: 0.622200
>
> These results were consistent which isn't surprising considering the
> fact that they themselves are averages.
> What do you think?

Those nymbers look very convincing to me, a cool 25.4% speedup!
mmap-perf is very MM intense - including vma lookup.

	Ingo
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