linux-kernel - Re: [RFC PATCH] freezer: revert 27920651fe "PM / Freezer: Make fake_signal_wake_up() wake TASK

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Message-ID: <20111101215710.GA13803@google.com>
Date:	Tue, 1 Nov 2011 14:57:10 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Jeff Layton <jlayton@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Steve French <sfrench@...ba.org>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-cifs@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>, trond.myklebust@...app.com,
	linux-nfs@...r.kernel.org
Subject: Re: [RFC PATCH] freezer: revert 27920651fe "PM / Freezer: Make
 fake_signal_wake_up() wake TASK_KILLABLE tasks too"

Hey, Oleg.

On Tue, Nov 01, 2011 at 08:46:01PM +0100, Oleg Nesterov wrote:
> On 11/01, Oleg Nesterov wrote:
> >
> > Or we can add TASK_FREEZABLE (like TASK_WAKEKILL), iirc we already
> > discussed this some time ago. And probably it makes sense to add the
> > generic wait_event_state().
> 
> Forgot to mention. I think that before anything else we need
> signal_wake_up_state(). For example, note that none of the callers
> of signal_wake_up(resume => true) in ptrace code wants to wake up
> the killable task.

Yeah, agreed for both wait_event_state() and signal_wake_up_state().
For now, let's go with the count/dont_count.  Can you please write up
a patch for that?  Jeff, does this seem okay to you?

For TASK_FREEZABLE, I'm not entirely sure.  Combined with
wait_event_state(), it can definitely reduce the number of different
variants of wait_event_*().  Let's see.

Thanks.

-- 
tejun
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