linux-kernel - Re: [PATCH 1/3] kthread: implement probe_kthread

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Message-ID: <20130330191222.GA31531@redhat.com>
Date:	Sat, 30 Mar 2013 20:12:22 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, david@...morbit.com,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] kthread: implement probe_kthread_data()

On 03/30, Tejun Heo wrote:
>
> On Sat, Mar 30, 2013 at 10:00 AM, Oleg Nesterov <oleg@...hat.com> wrote:
>
> > But I guess I missed the fact that this helper should be safe even this
> > @task can be the a vfork'ed user-space process, yes?
> >
>
> Yeap, we really don't know what to expect.

OK,

> > Or we can add to_live_kthread_safe() which checks "parent == kthreadd_task"
> > instead.
>
> But that would be more fragile than probe_read. I  mean, this thing will be
> called on BUGs and oopses.

OK, I agree.

Sorry for noise and thanks for your explanations, I really missed
the intent.

Oleg.

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