Messages in this thread | | | Date | Mon, 13 Jan 2014 18:12:38 +0100 | From | Peter Zijlstra <> | Subject | Re: Fwd: Re: RFC: cgroups aware proc |
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On Mon, Jan 13, 2014 at 06:23:50PM +0200, Marian Marinov wrote: > Hello Peter, > > I need help with the scheduler. > > I'm currently trying to patch the /proc/loadavg to show the load that is > only related to the processes from the current cgroup. > > I looked trough the code and I was hoping that tsk->sched_task_group->cfs_rq > struct will give me the needed information, but unfortunately for me, it did > not. > > Can you advise me, how to approach this problem?
Yeah, don't :-) Really, loadavg is a stupid metric.
> I'm totally new to the scheduler code.
Luckily you won't actually have to touch much of it. Most of the actual loadavg code lives in the first ~400 lines of kernel/sched/proc.c, read and weep. Its one of the best documented bits around.
Your proposition however is extremely expensive, you turn something that's already expensive O(nr_cpus) into something O(nr_cpus * nr_cgroups).
I'm fairly sure people will not like that, esp. for something of such questionable use as the loadavg -- its really only a pretty number that doesn't mean all that much.
> -------- Original Message -------- > From: Li Zefan <lizefan@huawei.com> > > Then you should add Peter, Ingo and LKML to your Cc list. :)
You failed that, let me fix that.
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