From: Hao Xu <email@example.com>
To: "Michal Koutný" <firstname.lastname@example.org>
Cc: Jens Axboe <email@example.com>, Zefan Li <firstname.lastname@example.org>,
Tejun Heo <email@example.com>, Johannes Weiner <firstname.lastname@example.org>,
Pavel Begunkov <email@example.com>,
Joseph Qi <firstname.lastname@example.org>
Subject: Re: [PATCH v4 0/2] refactor sqthread cpu binding logic
Date: Fri, 3 Sep 2021 22:43:59 +0800 [thread overview]
Message-ID: <email@example.com> (raw)
在 2021/9/3 上午12:48, Michal Koutný 写道:
> Hello Hao.
> On Wed, Sep 01, 2021 at 08:43:20PM +0800, Hao Xu <firstname.lastname@example.org> wrote:
>> This patchset is to enhance sqthread cpu binding logic, we didn't
>> consider cgroup setting before. In container environment, theoretically
>> sqthread is in its container's task group, it shouldn't occupy cpu out
>> of its container.
> I see in the discussions that there's struggle to make
> set_cpus_allowed_ptr() do what's intended under the given constraints.
> IIUC, set_cpus_allowed_ptr() is conventionally used for kernel threads
> . But does the sqthread fall into this category? You want to have it
> _directly_ associated with a container and its cgroups. It looks to me
sqthread is in it's creator's task group, so it is like a userspace
thread from this perspective. When it comes to container environemt
sqthread naturely belongs to a container which also contains its creator
And it has same cgroup setting with it's creator by default.
> more like a userspace thread (from this perspective, not literally). Or
> is there a different intention?
> It seems to me that reusing the sched_setaffinity() (with all its
> checks and race pains/solutions) would be a more universal approach.
> (I don't mean calling sched_setaffinity() directly, some parts would
> need to be factored separately to this end.) WDYT?
>  Not only spending their life in kernel but providing some
> delocalized kernel service.
prev parent reply other threads:[~2021-09-03 14:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 12:43 [PATCH v4 0/2] refactor sqthread cpu binding logic Hao Xu
2021-09-01 12:43 ` [PATCH 1/2] cpuset: add a helper to check if cpu in cpuset of current task Hao Xu
2021-09-01 12:43 ` [PATCH 2/2] io_uring: consider cgroup setting when binding sqpoll cpu Hao Xu
2021-09-01 16:41 ` Tejun Heo
2021-09-01 16:42 ` Tejun Heo
2021-09-03 15:04 ` Hao Xu
2021-09-07 16:54 ` Tejun Heo
2021-09-07 19:28 ` Hao Xu
2021-09-02 16:48 ` [PATCH v4 0/2] refactor sqthread cpu binding logic Michal Koutný
2021-09-02 18:00 ` Jens Axboe
2021-09-09 12:34 ` Michal Koutný
2021-09-03 14:43 ` Hao Xu [this message]
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