linux-kernel - Re: [PATCH] mm/filemap.c: unconditionally call mark_page

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Message-ID: <20070316142034.GA5962@kryten>
Date:	Fri, 16 Mar 2007 09:20:34 -0500
From:	Anton Blanchard <anton@...ba.org>
To:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Cc:	Ashif Harji <asharji@...uwaterloo.ca>, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>, Jan Kara <jack@...e.cz>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] mm/filemap.c: unconditionally call mark_page_accessed


Hi,

> I guess the downside to this is if a reader is reading a large file, or
> several files, sequentially with a small read size (smaller than
> PAGE_SIZE), the pages will be marked active after just one read pass.
> My gut says the benefits of this patch outweigh the cost.  I would
> expect real-world backup apps, etc. to read at least PAGE_SIZE.

PAGE_SIZE being 8k on sparc, 16-64k on ia64 and potentially 64kb on
powerpc :)

Id expect a large percentage of files to be below that size.

Anton
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