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Subject: Re: 2.5.64-mm6
From: Steven Cole <elenstev@mesatop.com>
To: Andrew Morton <akpm@digeo.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, LKML <linux-kernel@vger.kernel.org>,
       linux-mm@kvack.org
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Date: 13 Mar 2003 20:04:48 -0700
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On Thu, 2003-03-13 at 12:34, Andrew Morton wrote:
> Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> >
> > On Thu, 2003-03-13 at 03:26, Andrew Morton wrote:
> > >   This means that when an executable is first mapped in, the kernel will
> > >   slurp the whole thing off disk in one hit.  Some IO changes were made to
> > >   speed this up.
> > 
> > Does this just pull in text and data, or will it pull any debug sections
> > too?  That could fill memory with a lot of useless junk.
> > 
> 
> Just text, I expect.  Unless glibc is mapping debug info with PROT_EXEC ;)
> 
> It's just a fun hack.  Should be done in glibc.

Well, fun hack or glibc to-do list candidate, I hope it doesn't get
forgotten.  I am happy to confirm that it did speed up the initial
launch time of Open Office from 20 seconds (2.5-bk) to 11 seconds (-mm6)
and Mozilla from 10 seconds (2.5-bk) to 6 seconds (-mm6).

I did run 2.5.64-mm6 with mem=64M under stress for several hours and it
took a beating and kept on ticking, although quite slowly.

Steven


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