linux-kernel - Re: [tip:sched/core] sched/wait: Reimplement wait_event

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Message-ID: <20141104201203.GA15071@amd>
Date:	Tue, 4 Nov 2014 21:12:03 +0100
From:	Pavel Machek <pavel@....cz>
To:	len.brown@...el.com, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, mingo@...nel.org, peterz@...radead.org,
	torvalds@...ux-foundation.org, rjw@...ysocki.net, hpa@...or.com
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched/wait: Reimplement wait_event_freezable()

Hi!

> Commit-ID:  36df04bc5273a046f53b5e359febc1225f85aa7b
> Gitweb:     http://git.kernel.org/tip/36df04bc5273a046f53b5e359febc1225f85aa7b
> Author:     Peter Zijlstra <peterz@...radead.org>
> AuthorDate: Wed, 29 Oct 2014 12:21:57 +0100
> Committer:  Ingo Molnar <mingo@...nel.org>
> CommitDate: Tue, 4 Nov 2014 07:17:45 +0100
> 
> sched/wait: Reimplement wait_event_freezable()
> 
> Provide better implementations of wait_event_freezable() APIs.
> 
> The problem is with freezer_do_not_count(), it hides the thread from
> the freezer, even though this thread might not actually freeze/sleep
> at all.

Can you elaborate?

The thread will be in freezer_do_not_count() area, but it is just
waiting for event there, it should not do much damage.

If this is bugfix, should it be cc-ed to stable?

Did you test it with suspend/hibernation? Because I can't really see
how it works.

> +#define __wait_event_freezable(wq, condition)				\
> +	___wait_event(wq, condition, TASK_INTERRUPTIBLE, 0, 0,		\
> +			    schedule(); try_to_freeze())
> +

_Three_ underscores. And two underscore version exists, too,
fortunately it at least has different number of arguments.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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