On 04/18/2012 09:30 AM, Sha Zhengju wrote:
On Mon, Apr 9, 2012 at 6:25 PM, Glauber Costa<glommer@xxxxxxxxxxxxx> wrote:
> The cpuacct cgroup already exposes user and system numbers in a per-cgroup
> fashion. But they are a summation along the whole group, not a per-cpu figure.
> Also, they are coarse-grained version of the stats usually shown at places
> like /proc/stat.
>
> I want to have enough cgroup data to emulate the /proc/stat interface. To
> achieve that, I am creating a new file "stat_percpu" that displays the
> fine-grained per-cpu data. The original data is left alone.
>
> The format of this file resembles the one found in the usual cgroup's stat
> files. But of course, the fields will be repeated, one per cpu, and prefixed
> with the cpu number.
>
> Therefore, we'll have something like:
>
> cpu0.user X
> cpu0.system Y
> ...
> cpu1.user X1
> cpu1.system Y1
> ...
>
Why not show the all-cpu data together with the per-cpu one? I think
the total one
is an usual concern in most cases.
Because that is a trivial operation that can be done in userspace.
In general, I see no value in formatting this file any further if we'll
have to get to userspace for the final solution anyway.
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