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

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Message-ID: <Pine.LNX.4.64.0705011807550.28210@schroedinger.engr.sgi.com>
Date:	Tue, 1 May 2007 18:09:34 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Satyam Sharma <satyam.sharma@...il.com>,
	Nate Diller <nate.diller@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zero_user_page uses in fs/buffer.c and fs/libfs.c

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() ?

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