Bug 617199

Summary:	make exclusively owned pages belong to the local anon_vma on swapin
Product:	Red Hat Enterprise Linux 6	Reporter:	Rik van Riel <riel>
Component:	kernel	Assignee:	Rik van Riel <riel>
Status:	CLOSED ERRATA	QA Contact:	Caspar Zhang <czhang>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.1	CC:	aarcange, czhang, qcai
Target Milestone:	rc
Target Release:	6.1
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-2.6.32-112.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-19 12:41:21 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Rik van Riel 2010-07-22 13:20:06 UTC

Description of problem:

On swapin, pages are always assigned to the root anon_vma.  This can lead to pageout scalability issues when a large number of exclusively owned pages get swapped out and back in.

Need to backport my own 3 patches for this, as well as Kamezawa Hiroyuki's "Fix false positive BUG_ON in __page_set_anon_rmap" patch.

Comment 1 Andrea Arcangeli 2010-07-22 23:58:58 UTC

This is an optimization, I'm not sure how important this is.

This is my adapted patch that won't need the fix for bug-on.

http://git.kernel.org/?p=linux/kernel/git/andrea/aa.git;a=commitdiff;h=2fe4f42f0f17498984b3f86b2339d583004b45de;hp=ffd146080305632406d97c7f6f984a648854d755

Comment 4 RHEL Program Management 2010-11-20 13:19:23 UTC

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Comment 5 Aristeu Rozanski 2011-02-03 16:15:53 UTC

Patch(es) available on kernel-2.6.32-112.el6

Comment 10 errata-xmlrpc 2011-05-19 12:41:21 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0542.html