linux-kernel - Re: [PATCH 0/3] de_thread() should update ->real_start

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Message-ID: <CANcMJZDoSMGGSaohRJXwpVcxwxZPL=zmuWeviyiQ7nZuf6Ynfg@mail.gmail.com>
Date:	Mon, 10 Jun 2013 13:18:39 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tomas Smetana <tsmetana@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] de_thread() should update ->real_start_time

On Mon, Jun 10, 2013 at 11:33 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> 1/3 is the obvious bugfix, 2 and 3 are minor cleanups
>
> I am wondering, can't we kill task->real_start_time? What if we
> simply change copy_process
>
>         -       do_posix_clock_monotonic_gettime(&p->start_time);
>         +       get_monotonic_boottime(&p->start_time);


An additional thought: task_struct covers quite a bit of stuff, so I
don't know if this would be too useful, but we could further change
start_time to be a ktime_t, allowing possible additional space savings
in the task_struct on 64bit systems.

thanks
-john
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