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If there's a memcg failure a minor memleak could happen in khugepaged. This was found only by code review of the upstream submit of THP.

fix posted to rhkernel-list in Message-ID: <20101201233020.GO30389>

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.

Here a kernel rpm including the fix:

http://brewweb.devel.redhat.com/brew/taskinfo?taskID=2978493

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

kmemleak enabled to catch the leak, but failed when running memcg on both old and new kernels. 

looked into the patch, the patch in comment 6 was applied (from changelog), it was changed by the patch in bug 647849. But it should still valid since it only changed the label names.

Mark SanityOnly.

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