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Description of problem:

cgset truncates the value to set in a cgroup file to 100 characters

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

libcgroup-0.40.rc1-16

How reproducible:

Always

Steps to Reproduce:
1. Create a cpuset cgroup on a box with many logical cores
2. Use cgset to set cpuset.cpus to a list of logical cores - e.g.
cgset -r cpuset.cpus=0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47 testgroup
 
3. Run cgget to list cores in cgroup:

cgget -r cpuset.cpus testgroup
testgroup:
cpuset.cpus: 0-35

Actual results:

The value of the argument is truncated at 100 characters - so only (in this case) the first 36 logical cores are assigned to the cgroup

Expected results:

All listed cores assigned to the cgroup (first 48 in this case)

Additional info:

The libcgroup code has a hard limit of 100 characters: CG_VALUE_MAX in include/libcgroup/iterators.h

This value is far too small for machines with many logical cores

A simple patch has been suggested upstream, but nothing has happen with this - see:

http://permalink.gmane.org/gmane.comp.lib.libcg.devel/4350

*** This bug has been marked as a duplicate of bug 1441163 ***

Unfortunately, I don't have access to bug 1441163 ...

Does this mean the problem is/will be fixed?

Sorry James,

I'm reopening this BZ and I will update it after bug 1441163 gets resolved one way or the other.

Red Hat Enterprise Linux 6 is in the Production 3 Phase. During the Production 3 Phase, Critical impact Security Advisories (RHSAs) and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available.

The official life cycle policy can be reviewed here:

http://redhat.com/rhel/lifecycle

This issue does not meet the inclusion criteria for the Production 3 Phase and will be marked as CLOSED/WONTFIX. If this remains a critical requirement, please contact Red Hat Customer Support to request a re-evaluation of the issue, citing a clear business justification. Note that a strong business justification will be required for re-evaluation. Red Hat Customer Support can be contacted via the Red Hat Customer Portal at the following URL:

https://access.redhat.com/

James,

FYI, the issue will be fixed in libcgroup-0.40.rc1-26.el6.