linux-kernel - Re: [PATCH 1/1] x86/cqm: Cqm requirements

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Date:   Tue, 7 Mar 2017 15:31:49 -0800 (PST)
From:   Shivappa Vikas <vikas.shivappa@...el.com>
To:     Stephane Eranian <eranian@...gle.com>
cc:     "Luck, Tony" <tony.luck@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        "Shivappa, Vikas" <vikas.shivappa@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        "davidcc@...gle.com" <davidcc@...gle.com>
Subject: Re: [PATCH 1/1] x86/cqm: Cqm requirements



On Tue, 7 Mar 2017, Stephane Eranian wrote:

> Hi,
>
> On Tue, Mar 7, 2017 at 12:04 PM, Luck, Tony <tony.luck@...el.com> wrote:
>>> That's all nice and good, but I still have no coherent explanation why
>>> measuring across allocation domains makes sense.
>>
>> Is this in reaction to this one?
>>
>>>> 5)      Put multiple threads into a single measurement group
>>
>> If we fix it to say "threads from the same CAT group" does it fix things?
>>
> Inside a CAT partition, there may be multiple tasks split into
> different cgroups.
> We need the ability to monitor groups of tasks individually within that CAT
> partition. I think this is what this bullet is about.
>

The #8 covers that I think (or what we intended for 5..) ?

8)      Can get measurements for subsets of tasks in a CAT group (to find the
threads hogging the resources).

Thanks,
Vikas

>
>> We'd like to have measurement groups use a single RMID ... if we
>> allowed tasks from different CAT groups in the same measurement
>> group we wouldn't be able to split the numbers back to report the
>> right overall total for each of the CAT groups.
>>
>> -Tony
>