linux-kernel - Re: [PATCH 1/2] add SA

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Message-ID: <20110814171007.GA2097@redhat.com>
Date:	Sun, 14 Aug 2011 19:10:07 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>,
	containers@...ts.linux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] add SA_CLDREBOOT flag

On 08/14, Bruno Prémont wrote:
>
> On Sun, 14 August 2011 Oleg Nesterov <oleg@...hat.com> wrote:
> > On 08/11, Daniel Lezcano wrote:
> > >
> > > Add the SA_CLDREBOOT flag to enable the CLD_REBOOT on SIGCHLD
> > > when a process of a child pid namespace calls the reboot syscall.
> >
> > I doubt this is really useful in general. SIGCHLD doesn't queue,
> > if the parent of init already has the pending SIGCHLD it won't see
> > CLD_REBOOTED anyway. Anyway, you do not need a special helper to
> > fill siginfo.
> >
> > And personally I strongly dislike SA_CLDREBOOT. For what? Imho, this
> > is unnecessary complication. If we want SIGCHLD-on-reboot, just send
> > it unconditionally.
>
> The information that is needed is what options the container did pass
> to sys_reboot().
> Did the container want a reboot or a power-off (or maybe just touch the
> LINUX_REBOOT_CMD_CAD_* status)?
>
> As long as that information can reach parent/reaper of container's init
> the needed functionality should be there.

Sorry, can't understand.

Once again, why do you want SA_CLDREBOOT?

OK, you may be need to pass some info via siginfo (but note that it can
be lost, and you do not need a special helper for that). But why do you
want this hack in sa_flags?

Oleg.

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