linux-kernel - Re: [PATCH v10 10/10] x86/resctrl: Display RMID of resource group

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Date:   Mon, 25 Sep 2023 10:10:53 +0200
From:   Peter Newman <peternewman@...gle.com>
To:     Fenghua Yu <fenghua.yu@...el.com>
Cc:     Babu Moger <babu.moger@....com>, corbet@....net,
        reinette.chatre@...el.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, paulmck@...nel.org, akpm@...ux-foundation.org,
        quic_neeraju@...cinc.com, rdunlap@...radead.org,
        damien.lemoal@...nsource.wdc.com, songmuchun@...edance.com,
        peterz@...radead.org, jpoimboe@...nel.org, pbonzini@...hat.com,
        chang.seok.bae@...el.com, pawan.kumar.gupta@...ux.intel.com,
        jmattson@...gle.com, daniel.sneddon@...ux.intel.com,
        sandipan.das@....com, tony.luck@...el.com, james.morse@....com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        bagasdotme@...il.com, eranian@...gle.com,
        christophe.leroy@...roup.eu, jarkko@...nel.org,
        adrian.hunter@...el.com, quic_jiles@...cinc.com
Subject: Re: [PATCH v10 10/10] x86/resctrl: Display RMID of resource group

On Fri, Sep 22, 2023 at 7:59 PM Fenghua Yu <fenghua.yu@...el.com> wrote:
> On 9/22/23 07:36, Peter Newman wrote:
> > On Sat, Sep 16, 2023 at 12:42 AM Babu Moger <babu.moger@....com> 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@...gle.com>
>
> Please use "Tested-by" instead of "Tested-By" (the "By" is wrong).

Tested-by: Peter Newman <peternewman@...gle.com>

> >
> >> 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@...gle.com>
>
> Please use "Reviewed-by" instead of "Reviewed-By" (the "By" is wrong).

Reviewed-by: Peter Newman <peternewman@...gle.com>