linux-kernel - Re: [PATCH -tip 23/32] sched: Add a per-thread core scheduling interface

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Message-ID: <56050aff-fde9-621a-9f6d-87e4bcdd87fa@oracle.com>
Date:   Tue, 15 Dec 2020 09:56:38 -0500
From:   chris hyser <chris.hyser@...cle.com>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, mingo@...nel.org, fweisbec@...il.com,
        keescook@...omium.org, kerrnel@...gle.com,
        Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>, vineeth@...byteword.org,
        Chen Yu <yu.c.chen@...el.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Agata Gruza <agata.gruza@...el.com>,
        Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com>,
        graf@...zon.com, konrad.wilk@...cle.com, dfaggioli@...e.com,
        pjt@...gle.com, rostedt@...dmis.org, derkling@...gle.com,
        benbjiang@...cent.com,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
        Dhaval Giani <dhaval.giani@...cle.com>,
        Junaid Shahid <junaids@...gle.com>, jsbarnes@...gle.com,
        Ben Segall <bsegall@...gle.com>, Josh Don <joshdon@...gle.com>,
        Hao Luo <haoluo@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Tim Chen <tim.c.chen@...el.com>
Subject: Re: [PATCH -tip 23/32] sched: Add a per-thread core scheduling
 interface



On 12/14/20 6:25 PM, Joel Fernandes wrote:
> On Mon, Dec 14, 2020 at 02:44:09PM -0500, chris hyser wrote:
>> On 12/14/20 2:31 PM, Joel Fernandes wrote:
>>>> diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
>>>> index cffdfab..50c31f3 100644
>>>> --- a/kernel/sched/debug.c
>>>> +++ b/kernel/sched/debug.c
>>>> @@ -1030,6 +1030,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
>>>>    #ifdef CONFIG_SCHED_CORE
>>>>    	__PS("core_cookie", p->core_cookie);
>>>> +	__PS("core_task_cookie", p->core_task_cookie);
>>>>    #endif
>>>
>>> Hmm, so the final cookie of the task is always p->core_cookie. This is what
>>> the scheduler uses. All other fields are ingredients to derive the final
>>> cookie value.
>>>
>>> I will drop this hunk from your overall diff, but let me know if you
>>> disagree!
>>
>>
>> No problem. That was there primarily for debugging.
> 
> Ok. I squashed Josh's changes into this patch and several of my fixups. So
> there'll be 3 patches:
> 1. CGroup + prctl  (single patch as it is hell to split it)
> 2. Documentation
> 3. ksefltests
> 
> Below is the diff of #1. I still have to squash in the stop_machine removal
> and some more review changes. But other than that, please take a look and let
> me know anything that's odd.  I will test further as well.

Will do. Looking at it now and just started a build.

-chrish