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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 14 Mar 2007 15:55:41 -0500
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	Ashif Harji <asharji@...uwaterloo.ca>
Cc:	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

On Wed, 2007-03-14 at 15:58 -0400, Ashif Harji wrote:
> This patch unconditionally calls mark_page_accessed to prevent pages, 
> especially for small files, from being evicted from the page cache despite 
> frequent access.

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.

Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/