Bug 11025

Summary:	[problem] raid performance loss with 2.6.26-rc8 on 32-bit x86 (bisected)
Product:	Memory Management	Reporter:	Rafael J. Wysocki (rjw)
Component:	Page Allocator	Assignee:	Andrew Morton (akpm)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	bunk, dan.j.williams
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.26-rc8	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	10492

Description Rafael J. Wysocki 2008-07-02 07:33:15 UTC

Subject    : [problem] raid performance loss with 2.6.26-rc8 on 32-bit x86 (bisected)
Submitter  : Dan Williams <dan.j.williams@intel.com>
Date       : 2008-07-01 1:57
References : http://marc.info/?l=linux-kernel&m=121487749429883&w=4
Handled-By : Mel Gorman <mel@csn.ul.ie>
Handled-By : Andy Whitcroft <apw@shadowen.org>

This entry is being used for tracking a regression from 2.6.25.  Please don't
close it until the problem is fixed in the mainline.

Comment 1 Rafael J. Wysocki 2008-07-02 09:30:49 UTC

Reportedly cause by:

Author: Mel Gorman <mel@csn.ul.ie>
Date:   Mon Apr 28 02:12:16 2008 -0700

    mm: use two zonelist that are filtered by GFP mask

    Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    Acked-by: Christoph Lameter <clameter@sgi.com>
    Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Mel Gorman <mel@csn.ul.ie>
    Cc: Christoph Lameter <clameter@sgi.com>
    Cc: Hugh Dickins <hugh@veritas.com>
    Cc: Nick Piggin <nickpiggin@yahoo.com.au>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Comment 2 Adrian Bunk 2008-07-06 08:50:11 UTC

fixed by commit 494de90098784b8e2797598cefdd34188884ec2e