lkml.org 
[lkml]   [2010]   [Feb]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 10/11] readahead: dont do start-of-file readahead after lseek()


On Tue, 2 Feb 2010, Wu Fengguang wrote:
>
> Some applications (eg. blkid, id3tool etc.) seek around the file
> to get information. For example, blkid does
> seek to 0
> read 1024
> seek to 1536
> read 16384
>
> The start-of-file readahead heuristic is wrong for them, whose
> access pattern can be identified by lseek() calls.
>
> So test-and-set a READAHEAD_LSEEK flag on lseek() and don't
> do start-of-file readahead on seeing it. Proposed by Linus.
>
> CC: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>

Linus


\
 
 \ /
  Last update: 2010-02-02 18:43    [W:0.126 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site