linux-kernel - [PATCH] Improve heuristic detecting sequential reads

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-next>] [day] [month] [year] [list]

Message-ID: <20070410155411.GF13445@duck.suse.cz>
Date:	Tue, 10 Apr 2007 17:54:11 +0200
From:	Jan Kara <jack@...e.cz>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, npiggin@...e.de
Subject: [PATCH] Improve heuristic detecting sequential reads

  Hello!

  In thread http://lkml.org/lkml/2007/3/9/403, we discussed a problem
with the current heuristic for detecting sequential IO in
do_generic_mapping_read() - for small files a page is marked as accessed
only once which can cause a performance problems.
  Attached is a patch that improves the heuristic by introducing a
ra.offset variable so now we can reliably detect sequetial reads.
The patch replaces Nick's patch from http://lkml.org/lkml/2007/3/15/177
(Nick has acked to replace the patch). Could you please put the patch
into -mm?

							Bye
								Honza

-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs

View attachment "readahead-2.6.21-rc6.diff" of type "text/x-patch" (3582 bytes)