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https://reviews.apache.org/r/75166/
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Review request for mesos and Benjamin Mahler.


Repository: mesos


Description
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To support nested containers with nested cgroups, we need to enable
controllers in cgroup.subtree_control file for the appropriate nested
cgroup.

To do so, we need to ensure that the parents have the the requested
controller in their cgroup.subtree_control file so that the nested
cgroup can have the controller written into subtree_control as well.
Otherwise we will get a 'no such file or directory' error.


Diffs
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  src/slave/containerizer/mesos/isolators/cgroups2/cgroups2.cpp 
c9162c4ad74225fc736e8dfc7f3d108c115c543b 


Diff: https://reviews.apache.org/r/75166/diff/1/


Testing
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With SupportNesting() returning true, ROOT_CGROUPS_RecoverNestedWithoutConfig 
with an independent cgroup is able to pass, whereas before it fails with 
'(launch).failure(): Failed to enable controller 'cpu' in cgroup 
'mesos_test/52240cb6-96ee-425d-a5dc-d34a6d0a51d0/mesos/f3039785-f2a0-430f-a5a5-35a884cd8168':
 No such file or directory'


Thanks,

Jason Zhou

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