linux-kernel - Re: [PATCH v10 3/5] sched: Enforce user requested affinity

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Message-ID: <f115b037-e687-38f2-a270-bbf3c9f90ef8@redhat.com>
Date:   Fri, 7 Oct 2022 11:23:24 -0400
From:   Waiman Long <longman@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH v10 3/5] sched: Enforce user requested affinity

On 10/7/22 10:57, Waiman Long wrote:
>
> On 10/7/22 06:01, Peter Zijlstra wrote:
>> On Thu, Sep 22, 2022 at 02:00:39PM -0400, Waiman Long wrote:
>>> @@ -9647,6 +9656,9 @@ void __init sched_init(void)
>>>               cpumask_size(), GFP_KERNEL, cpu_to_node(i));
>>>           per_cpu(select_rq_mask, i) = (cpumask_var_t)kzalloc_node(
>>>               cpumask_size(), GFP_KERNEL, cpu_to_node(i));
>>> +        per_cpu(runqueues.scratch_mask, i) =
>>> +            (cpumask_var_t)kzalloc_node(cpumask_size(),
>>> +                            GFP_KERNEL, cpu_to_node(i));
>>>       }
>>>   #endif /* CONFIG_CPUMASK_OFFSTACK */
>> That doesn't actually apply; I've made it:
>>
>> --- a/kernel/sched/core.c
>> +++ b/kernel/sched/core.c
>> @@ -9748,6 +9748,7 @@ void __init sched_init(void)
>>             rq->core_cookie = 0UL;
>>   #endif
>> + zalloc_cpumask_var_node(&per_cpu(runqueues.scratch_mask, i), 
>> GFP_KERNEL, cpu_to_node(i));
>>       }
>>         set_load_weight(&init_task, false);
>>
> Sorry, I should have worked on the latest tip tree instead.

To be consistent with the surround context, it may be better to change 
it to

+        zalloc_cpumask_var_node(rq->scratch_mask, GFP_KERNEL, 
cpu_to_node(i));

Cheers,
Longman