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

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Message-ID: <16a390e4-b44d-b0eb-1df6-6e56d78d009f@oracle.com>
Date:   Mon, 14 Dec 2020 14:44:09 -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,
        torvalds@...ux-foundation.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>,
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        Ben Segall <bsegall@...gle.com>, Josh Don <joshdon@...gle.com>,
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        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 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.

Thanks.

-chrish