Bug 644987

Summary:	Enable extraction of hugepage pfn(s) from /proc/<pid>/pagemap
Product:	Red Hat Enterprise Linux 6	Reporter:	Larry Woodman <lwoodman>
Component:	kernel	Assignee:	Larry Woodman <lwoodman>
Status:	CLOSED ERRATA	QA Contact:	Petr Beňas <pbenas>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6.1	CC:	arozansk, pbenas, pstehlik, qcai
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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 20:26:40 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 Larry Woodman 2010-10-20 17:42:04 UTC

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 17:43:38 UTC

Posted patch to rhkernel-list for commits these commits:

5dc37642cbce34619e4588a9f0bdad1d2f870956
116354d177ba2da37e91cf884e3d11e67f825efd
1a5cb81465b66b74bf3d6ad36e5382238de6a132

Comment 4 RHEL Program Management 2010-11-19 17:20:14 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 2010-12-16 20:53:29 UTC

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

Comment 11 Petr Beňas 2011-03-07 12:38:40 UTC

Verified in 2.6.32-92.el6.

Comment 12 errata-xmlrpc 2011-05-23 20:26:40 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