Messages in this thread | | | Date | Fri, 02 May 2008 14:44:14 +0530 | From | Balbir Singh <> | Subject | Re: [Libcg-devel] cgroupstats, plans? |
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Paul Menage wrote: > On Tue, Apr 29, 2008 at 5:20 AM, Dhaval Giani <dhaval@linux.vnet.ibm.com> wrote: >> Hi Paul, >> >> You had mentioned in http://lkml.org/lkml/2008/4/8/29 about cgroup >> binary API for statistics. What is the status wrt to that? > > I've not really had mmore time to work on that since then. > > Assuming people are happy with the basic ideas in that post then I > guess the important questions to focus on would be: > > - what form should the API description to userspace take? Something > like the cgroup.api file that I proposed a while ago? > > - how would the user specify and retrieve a specific set of stats? > should we just dump all stats on each read request, or will that be > too expensive for some stats? >
I would prefer to select the controller from user stats and then dump the stats from the kernel for that controller using cgroupstats.
>> We are looking to export statistics using libcg. One of the questions >> that comes up is when is a file in the cgroup, a control file (one used >> to control the parameters of the subsystem) and when is it a file which >> is related to statistics. > > I don't see why some of them can't be both. If a file has a numerical > value associated with it, is there any reason not to make it available > via the binary stats API, regardless of whether that value was > generated by userspace or the kernel? >
I agree. I think we need to start pushing the statistics so that we can have a good set of statistics. I am going to try and do some cgroupstats work and publish it soon.
-- Warm Regards, Balbir Singh Linux Technology Center IBM, ISTL
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