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From: Oleg Nesterov <oleg@tv-sign.ru>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@osdl.org>, Pavel Machek <pavel@ucw.cz>,
	Srivatsa Vaddagiri <vatsa@in.ibm.com>,
	Aneesh Kumar <aneesh.kumar@gmail.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Gautham R Shenoy <ego@in.ibm.com>
Subject: Re: [RFC][PATCH 1/3] Freezer: Fix vfork problem
Date: Mon, 26 Feb 2007 15:00:43 +0300	[thread overview]
Message-ID: <20070226120043.GB234@tv-sign.ru> (raw)
In-Reply-To: <200702261147.12274.rjw@sisk.pl>

On 02/26, Rafael J. Wysocki wrote:
>
> The changelog explains it pretty well, I hope, but I have one more comment to
> start with.  Namely, in this version of the patch I've added
> 
> +	if (is_user_space(current))
> +		try_to_freeze();
> 
> to freezer_count() instead of just try_to_freeze().  This way kernel threads
> can avoid being frozen where they don't want to.

In that case we should also modify ____call_usermodehelper(), otherwise we have
the same "deadlock" if it is frozen. But this is not so easy to do as I thought
before.

Oleg.


  reply	other threads:[~2007-02-26 12:00 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-26 10:39 [RFC][PATCH 0/3] More freezer patches Rafael J. Wysocki
2007-02-26 10:47 ` [RFC][PATCH 1/3] Freezer: Fix vfork problem Rafael J. Wysocki
2007-02-26 12:00   ` Oleg Nesterov [this message]
2007-02-26 15:14     ` Srivatsa Vaddagiri
2007-02-26 16:11       ` Oleg Nesterov
2007-02-26 18:28         ` Rafael J. Wysocki
2007-02-26 21:25           ` Oleg Nesterov
2007-02-27  0:31             ` Rafael J. Wysocki
2007-02-27  4:33               ` Aneesh Kumar
2007-02-27  4:42                 ` Srivatsa Vaddagiri
2007-02-27  8:37                 ` Oleg Nesterov
2007-02-27 21:21                   ` Rafael J. Wysocki
2007-02-27 21:53                     ` Oleg Nesterov
2007-02-28  1:23                       ` Srivatsa Vaddagiri
2007-02-28 10:57                         ` Rafael J. Wysocki
2007-02-28 11:00                           ` Oleg Nesterov
2007-02-28 19:36                             ` Rafael J. Wysocki
2007-02-28 20:30                               ` Oleg Nesterov
2007-02-28 22:34                                 ` Rafael J. Wysocki
2007-02-28 11:01                           ` Srivatsa Vaddagiri
2007-02-26 10:49 ` [RFC][PATCH 2/3] Freezer: Take kernel_execve into consideration Rafael J. Wysocki
2007-02-26 12:45   ` Pavel Machek
2007-02-26 10:52 ` [RFC][PATCH 3/3] Freezer: Prevent ___call_usermodehelper from missing freezing requests Rafael J. Wysocki
2007-02-26 11:52   ` Oleg Nesterov
2007-02-26 11:58   ` Aneesh Kumar
2007-02-26 18:30     ` Rafael J. Wysocki

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