linux-kernel - Re: [RFC][PATCH 0/3] fork: Add the ability to create tasks with given pids

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Message-ID: <20111127173430.GB5674@redhat.com>
Date:	Sun, 27 Nov 2011 18:34:30 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Pavel Emelyanov <xemul@...allels.com>, Tejun Heo <tj@...nel.org>,
	Pedro Alves <pedro@...esourcery.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	James Bottomley <jbottomley@...allels.com>
Subject: Re: [RFC][PATCH 0/3] fork: Add the ability to create tasks with
	given pids

On 11/27, Konstantin Khlebnikov wrote:
>
> We can add flag to sys_wait4(), and stash pid in wait_task_zombie(), right before release_task()
> code will looks something like this:
>
> -       if (p != NULL)
> +       if (p != NULL) {
> +               if ((wo->wo_flags & WCATCHPID) && !current->pid_stash) {
> +                       struct pid *pid = task_pid(p);
> +
> +                       pid->flags |= PID_STASHED;
> +                       current->pid_stash = get_pid(pid);
> +               }
>                 release_task(p);
> +       }
>
> And next fork() creates child with the same pid.
> So, struct pid will work like boomerang =)

Like PR_RESERVE_PID, this can only help if the tracee (or whatever)
is single-threaded and it is the natural child.

Personally I do not think such a limited interface makes sense.

Oleg.

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