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Description of problem:

There are few race condition fixes and cleanups which went upstream in blkio controller related code (blk-cgroup, blk-throttle, cfq-iosched). Pick some of
the changes and pull in 6.2.

This also helps backporting the lockless IO throttling patches in otherwise
patches don't apply as their are dependencies.

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


How reproducible:


Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

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-2.6.32-160.el6

confirmed patches are in the -215 kernel, also confirmed operation of blkio controller in testing with libvirt based guests as well as LTP IO testing.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2011-1530.html