Re: [PATCH][v3] x86/resctrl: Add task resctrl information display

[Yu Chen]

Hi Thomas,
On Wed, Nov 20, 2019 at 7:23 PM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
>
> On Wed, 20 Nov 2019, Chen Yu wrote:
> > Monitoring tools that want to find out which resctrl CTRL
> > and MONITOR groups a task belongs to must currently read
> > the "tasks" file in every group until they locate the process
> > ID.
> >
> > Add an additional file /proc/{pid}/resctrl to provide this
> > information.
> >
> > For example:
> >  cat /proc/1193/resctrl
> > CTRL_MON:/ctrl_grp0
> > MON:/ctrl_grp0/mon_groups/mon_grp0
>
> The formatting is quite ugly and I don't see why this needs to be multiple
> lines and have these uppercase prefixes.
>
> A task can only be part of one control group and of one monitoring group
> which is associated to the control group. So just providing:
>
>  1)   ""
>  2)   "/"
>  3)   "/mon_groups/mon0"
>  4)   "/group0"
>  5)   "/group0/mon_groups/mon1"
>
> is simple and clear enough, i.e.:
>
> #1: Resctrl is not available
>
> #2: Task is part of the root group, task not associated to any monitoring
>     group
>
> #3: Task is part of the root group and monitoring group mon0
>
> #4: Task is part of control group group0, task not associated to any
>     monitoring group
>
> #5: Task is part of control group group0 and monitoring group mon1
>
> Hmm?
>
Yes, good idea, this is much more simpler.  I'll send the new version
out based on this.

Thanks,
Chenyu