Bug 644987 – Enable extraction of hugepage pfn(s) from /proc/<pid>/pagemap

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Bug 644987 - Enable extraction of hugepage pfn(s) from /proc/<pid>/pagemap

Summary:	Enable extraction of hugepage pfn(s) from /proc/<pid>/pagemap

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	6.1
Hardware:	All Linux

Priority	low Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Larry Woodman
QA Contact:	Petr Beňas
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2010-10-20 13:42 EDT by Larry Woodman
Modified:	2015-01-04 17:59 EST (History)
CC List:	4 users (show)

See Also:
Fixed In Version:	kernel-2.6.32-92.el6
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-05-23 16:26:40 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0542	normal	SHIPPED_LIVE	Important: Red Hat Enterprise Linux 6.1 kernel security, bug fix and enhancement update	2011-05-19 07:58:07 EDT

Groups: None (edit)

Description Larry Woodman 2010-10-20 13:42:04 EDT

Description of problem:

Enable extraction of hugepage pfn(s) from /proc/<pid>/pagemap

Need to backport upstream patches that allow the PFNs of hugepages to be extracted from /proc/<pid#>/pagemap.  Without this patch Documentation/vm/page-types.c doesnt show any hugepages because walk_page_range() blindly skips them.

Intel confirmed on the weekly performance call they are using this to bind processes to NUMA nodes and verify those bindings. 

These are the upstream commit IDs:

5dc37642cbce34619e4588a9f0bdad1d2f870956
116354d177ba2da37e91cf884e3d11e67f825efd
1a5cb81465b66b74bf3d6ad36e5382238de6a132


Version-Release number of selected component (if applicable):


How reproducible:

Compile Documentation/vm/page-types.c and run page-types.  Without these patches no hugepages are shown.  With these patches the ouptou includes hugepages.

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

Comment 1 Larry Woodman 2010-10-20 13:43:38 EDT

Posted patch to rhkernel-list for commits these commits:

5dc37642cbce34619e4588a9f0bdad1d2f870956
116354d177ba2da37e91cf884e3d11e67f825efd
1a5cb81465b66b74bf3d6ad36e5382238de6a132

Comment 4 RHEL Product and Program Management 2010-11-19 12:20:14 EST

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 2010-12-16 15:53:29 EST

Patch(es) available on kernel-2.6.32-92.el6

Comment 11 Petr Beňas 2011-03-07 07:38:40 EST

Verified in 2.6.32-92.el6.

Comment 12 errata-xmlrpc 2011-05-23 16:26:40 EDT

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

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