linux-kernel - Re: [RFC][PATCH 1/3] Freezer: Fix vfork problem

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Message-ID: <20070228110048.GA263@tv-sign.ru>
Date:	Wed, 28 Feb 2007 14:00:48 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	vatsa@...ibm.com, Aneesh Kumar <aneesh.kumar@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [RFC][PATCH 1/3] Freezer: Fix vfork problem

On 02/28, Rafael J. Wysocki wrote:
>
> On Wednesday, 28 February 2007 02:23, Srivatsa Vaddagiri wrote:
> > On Wed, Feb 28, 2007 at 12:53:14AM +0300, Oleg Nesterov wrote:
> > > I think it is good. Srivatsa?
> > 
> > Maybe additional comments on why we don't skip vfork kernel tasks may be good. 
> 
> Which is because we don't want the kernel threads to be frozen in unexpected
> places, so we allow them to block freeze_processes() instead or to set
> PF_NOFREEZE?

... and because in fact it won't block freeze_processes(), ____call_usermodehelper
(the child) does a minimum before exec/exit, and it can't be frozen until it wakes
up the parent.

Oleg.

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