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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:

Posted patch to rhkernel-list for commits these commits:

5dc37642cbce34619e4588a9f0bdad1d2f870956
116354d177ba2da37e91cf884e3d11e67f825efd
1a5cb81465b66b74bf3d6ad36e5382238de6a132

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.

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

Verified in 2.6.32-92.el6.

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