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From: wind@cocodriloo.com
Date: Mon, 17 Mar 2003 17:52:23 +0100
To: Rik van Riel <riel@surriel.com>
Cc: linux-kernel@vger.kernel.org, akpm@digeo.com
Subject: Re: 2.4 vm, program load, page faulting, ...
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References: <20030317151004.GR20188@holomorphy.com> <Pine.LNX.4.44.0303171100300.2571-100000@chimarrao.boston.redhat.com>
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On Mon, Mar 17, 2003 at 11:01:31AM -0500, Rik van Riel wrote:
> On Mon, 17 Mar 2003, William Lee Irwin III wrote:
> > On Sat, 15 Mar 2003, Paul Albrecht wrote:
> > >> ... Why does the kernel page fault on text pages, present in the page
> > >> cache, when a program starts? Couldn't the pte's for text present in the
> > >> page cache be resolved when they're mapped to memory?
> > 
> > SVR4 did and saw an improvement wrt. page fault rate, according to
> > Vahalia.
> 
> An improvement in the _page fault rate_, well DUH.
> 
> > I'd like to see whether this is useful for Linux.
> 
> The question is, does it result in an improvement in the
> run speed of processes...
> 
> cheers,
> 
> Rik

You should ask Andrew about his patch to do exactly that: he
forced all PROC_EXEC mmaps to be nonlinear-mapped and this
forced all programs to suck entire binaries into memory...
I recall he saw at least 25% improvement at launching gnome.

Andrew?

-- 
Antonio Vargas
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