Hi Babu,
On Sat, Sep 16, 2023 at 12:42 AM Babu Moger <babu.moger@xxxxxxx> wrote:
>
> In x86, hardware uses RMID to identify a monitoring group. When a user
> creates a monitor group these details are not visible. These details
> can help resctrl debugging.
>
> Add RMID(mon_hw_id) to the monitor groups display in resctrl interface.
> Users can see these details when resctrl is mounted with "-o debug" option.
When I reviewed this, I went through the whole series second-guessing
the wording above and wondering whether "monitoring groups" applied to
CTRL_MON groups.
I was able to confirm that mon_hw_id did appear and had a believable
value in CTRL_MON groups which had allocated monitors. (and I added
some comma-separated PID lists to the tasks node)
for the series:
Tested-By: Peter Newman <peternewman@xxxxxxxxxx>
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index a07fa4329b65..b4910892b0a6 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -296,6 +296,11 @@ struct rdtgroup {
> * --> RFTYPE_BASE (Files common for both MON and CTRL groups)
> * Files: cpus, cpus_list, tasks
> *
> + * --> RFTYPE_MON (Files only for MON group)
If monitoring is supported, all groups are MON groups. I think the
"only" above caused me to second guess whether this takes into account
CTRL_MON groups getting the RFTYPE_MON flag set dynamically.
However, I think the documentation above is still technically accurate.
for the series:
Reviewed-By: Peter Newman <peternewman@xxxxxxxxxx>
Thanks!
-Peter
