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

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Date:	Sat, 04 May 2013 21:19:49 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Tejun Heo <tj@...nel.org>
Cc:	Colin Cross <ccross@...roid.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, 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 Thursday, May 02, 2013 05:08:12 PM Tejun Heo wrote:
> 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>

I wonder if that includes [3/10] (just to get the record straight)?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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