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From:   SeongJae Park <sj38.park@gmail.com>
To:     Shakeel Butt <shakeelb@google.com>
Cc:     SeongJae Park <sj38.park@gmail.com>,
        SeongJae Park <sjpark@amazon.de>, Jonathan.Cameron@huawei.com,
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Subject: Re: [PATCH v31 08/13] mm/damon/dbgfs: Export kdamond pid to the user space
Date:   Thu, 24 Jun 2021 10:26:23 +0000
Message-Id: <20210624102623.24563-5-sjpark@amazon.de>
In-Reply-To: <20210624102623.24563-1-sjpark@amazon.de>
References: <20210624102623.24563-1-sjpark@amazon.de>
In-Reply-To: <CALvZod703WD0Ab8EMpd6+JxzhKEjnwZkYRA9VB5LoUmG_yccSQ@mail.gmail.com>
Precedence: bulk

From: SeongJae Park <sjpark@amazon.de>

On Tue, 22 Jun 2021 11:23:12 -0700 Shakeel Butt <shakeelb@google.com> wrote:

> On Mon, Jun 21, 2021 at 1:31 AM SeongJae Park <sj38.park@gmail.com> wrote:
> >
> > From: SeongJae Park <sjpark@amazon.de>
> >
> > For CPU usage accounting, knowing pid of the monitoring thread could be
> > helpful.  For example, users could use cpuaccount cgroups with the pid.
> >
> > This commit therefore exports the pid of currently running monitoring
> > thread to the user space via 'kdamond_pid' file in the debugfs
> > directory.
> >
> > Signed-off-by: SeongJae Park <sjpark@amazon.de>
> > Reviewed-by: Fernand Sieber <sieberf@amazon.com>
> > ---
> 
> [...]
> 
> >
> > +static const struct file_operations kdamond_pid_fops = {
> > +       .owner = THIS_MODULE,
> 
> I don't think you need to set the owner (and for other fops) as these
> files are built into modules. Otherwise it looks good.

Good point.  Will remove those from the next spin.


Thanks,
SeongJae Park