Messages in this thread | | | Date | Wed, 14 May 2014 12:21:25 +0800 | From | Li Zefan <> | Subject | Re: [PATCHSET cgroup/for-3.16] cgroup: iterate cgroup_subsys_states directly |
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Hi Tejun,
On 2014/5/10 5:31, Tejun Heo wrote: > Hello, > > Currently, while csses (cgroup_subsys_states) have ->parent linkage > too, only cgroups form full tree through their ->children and > ->sibling fields and css iterations naturally is implemented by > iterating cgroups and then dereferencing the css for the specified > subsystem. > > There are now use cases where controllers need to iterate through > csses regardless of their online state as long as they have positive
What use cases are we talking about here?
> reference. This can't easily be achieved by iterating cgroups because > its css pointer array needs to be cleared on offline and there may be > multiple dying csses for a cgroup for the same subsystem and there's > only one pointer per cgroup-subsystem pair. >
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