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Description of problem: sometime the young bits could be ignored erroneously on hugepages with page_referenced()


Version-Release number of selected component (if applicable): 6.0 and 6.1


How reproducible: Not easily reproducible. It may generate some unnecessary swapping.


Steps to Reproduce:
1. allocate memory, bzero it
2. fork()
3. bzero the memory in the child to trigger cows and mlock the memory in the child
  
Actual results:

The pages in the parent shouldn't be easily swapped out.

Expected results:

The pages in the parent are more easily swapped out than expected.

I submitted a fix that applies to both RHEL6 and RHEL6.1 kernels on rhkernel-list with Message-ID: <20110308134243.GT25641>

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-2.6.32-128.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