linux-kernel - Re: [PATCH v2 10/10] af_unix: use freezable blocking calls in read

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Message-ID: <20130503000812.GY19814@mtj.dyndns.org>
Date:	Thu, 2 May 2013 17:08:12 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, arve@...roid.com,
	Oleg Nesterov <oleg@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Gao feng <gaofeng@...fujitsu.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 10/10] af_unix: use freezable blocking calls in read

On Wed, May 01, 2013 at 06:35:08PM -0700, Colin Cross wrote:
> Avoid waking up every thread sleeping in read call on an AF_UNIX
> socket during suspend and resume by calling a freezable blocking
> call.  Previous patches modified the freezer to avoid sending
> wakeups to threads that are blocked in freezable blocking calls.
> 
> This call was selected to be converted to a freezable call because
> it doesn't hold any locks or release any resources when interrupted
> that might be needed by another freezing task or a kernel driver
> during suspend, and is a common site where idle userspace tasks are
> blocked.

Heh, so you are aware of the deadlock possibilities.  Good selection
of spots.  For all the conversion patches.

 Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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