linux-kernel - Re: [PATCH] cgroup/cpuset: Clean up cpuset_task_status

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Date:   Tue, 29 Nov 2022 10:53:02 +0800
From:   Haifeng Xu <haifeng.xu@...pee.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     longman@...hat.com, lizefan.x@...edance.com, hannes@...xchg.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup/cpuset: Clean up cpuset_task_status_allowed



On 2022/11/29 01:07, Tejun Heo wrote:
> On Fri, Nov 25, 2022 at 07:51:33AM +0000, haifeng.xu wrote:
>> cpuset_task_status_allowed just shows mems_allowed status, so
>> rename it to task_mems_allowed. Moreover, it's only used in
>> proc_pid_status, so move it to fs/proc/array.c. There is no
>> intentional function change.
>>
>> Signed-off-by: haifeng.xu <haifeng.xu@...pee.com>
> 
> mems_allowed being a very much cpuset feature, I don't see how this is an
> improvement. The new code is different and can be another way of doing it,
> sure, but there's no inherent benefit to it. What's the point of the churn?
> 
> Thanks.
> 

Hi, tejun.

In proc_pid_status, task_cpus_allowed is used to show cpus_allowed, similar to that,
task_mems_allowed is more specific to show mems_allowed. Also cpuset_task_status_allowed
is used to dispaly memory status in '/proc/<pid>/status' and isn't used in other files, so
keep it in the fs/proc/array.c.

Thanks,
Haifeng.