linux-kernel - Re: [PATCH] zero_user_page uses in fs/buffer.c and fs/libfs.c

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Message-ID: <5c49b0ed0705011916y89212c0v1cec1cb1edae052f@mail.gmail.com>
Date:	Tue, 1 May 2007 19:16:32 -0700
From:	"Nate Diller" <nate.diller@...il.com>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Satyam Sharma" <satyam.sharma@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zero_user_page uses in fs/buffer.c and fs/libfs.c

On 5/1/07, Christoph Lameter <clameter@....com> wrote:
> On Tue, 1 May 2007, Andrew Morton wrote:
>
> > As Satyam said, this will sometimes cause us to map and unmap the page
> > twice, and to run flush_dcache_page() twice.  In not-terribly-uncommon
> > circumstances in very frequently called functions.
> >
> > Doesn't seem worth it to me.
>
> Ok but we have that code three times. Should I add a variant of
> zero_user_page that zeroes everything but the section specified?
>
> zero_user_page_allbut() ?

the function already exists, it's called simple_prepare_write(), and i
thought there were patches to convert those callsites in -mm ...
although it looks like i let a review comment on that slide by.  I
need to redo a bunch of patches for re-submission anyway, so i guess
i'll deal with that tomorrow.

NATE
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