linux-kernel - Re: [PATCH -mm] coredump: format_corename: don't append .%pid if multi-threaded

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Date:	Tue, 22 Jul 2008 16:43:14 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Michael Kerrisk <mtk.manpages@...glemail.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Roland McGrath <roland@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, andi@...stfloor.org
Subject: Re: [PATCH -mm] coredump: format_corename: don't append .%pid if multi-threaded

On 07/22, Michael Kerrisk wrote:
>
> On Tue, Jul 22, 2008 at 2:18 PM, Oleg Nesterov <oleg@...sign.ru> wrote:
> > If the coredumping is multi-threaded, format_corename() appends .%pid
> > to the corename. This was needed before the proper multi-thread core
> > dump support, now all the threads in the mm go into a single unified
> > core file.
> >
> > Remove this special case, it is not even documented and we have "%p"
> > and core_uses_pid.
> 
> Hi Oleg,
> 
> I have not thought about this at any length, but one question that
> jumps to mind: could this feature still be useful for LinuxThreads,
> where each thread does indeed have a separate PID?

As far as I know, LinuxThreads use CLONE_VM, right?

The coredump will create the single core file for all processes because
they have the same ->mm, the "threads" won't dump all over each other.

And, just in case, this patch doesn't make any difference if core_uses_pid
is set or pid_in_pattern is true.

That said, this is the user-visible change...

Oleg.

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