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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.
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Actual results:
Expected results:
Additional info:
Posted patch to rhkernel-list for commits these commits:
5dc37642cbce34619e4588a9f0bdad1d2f870956
116354d177ba2da37e91cf884e3d11e67f825efd
1a5cb81465b66b74bf3d6ad36e5382238de6a132
Comment 4RHEL 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.
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