linux-kernel - Re: [PATCH V3 1/4] kthread: add a mechanism to store cgroup info

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Message-ID: <20170915155115.GG378890@devbig577.frc2.facebook.com>
Date:   Fri, 15 Sep 2017 08:51:15 -0700
From:   Tejun Heo <tj@...nel.org>
To:     Shaohua Li <shli@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        lizefan@...wei.com, tglx@...utronix.de, kernel-team@...com,
        axboe@...nel.dk, Shaohua Li <shli@...com>
Subject: Re: [PATCH V3 1/4] kthread: add a mechanism to store cgroup info

On Thu, Sep 14, 2017 at 02:02:04PM -0700, Shaohua Li wrote:
> From: Shaohua Li <shli@...com>
> 
> kthread usually runs jobs on behalf of other threads. The jobs should be
> charged to cgroup of original threads. But the jobs run in a kthread,
> where we lose the cgroup context of original threads. The patch adds a
> machanism to record cgroup info of original threads in kthread context.
> Later we can retrieve the cgroup info and attach the cgroup info to jobs.
> 
> Since this mechanism is only required by kthread, we store the cgroup
> info in kthread data instead of generic task_struct.
> 
> Signed-off-by: Shaohua Li <shli@...com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun