linux-kernel - Re: [PATCH/RFC] sched: Remove SYSTEM_RUNNING checks from cond

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Message-ID: <20090709232021.GD1469@ucw.cz>
Date:	Fri, 10 Jul 2009 01:20:21 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	a.p.zijlstra@...llo.nl, oleg@...hat.com, avorontsov@...mvista.com,
	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC] sched: Remove SYSTEM_RUNNING checks from
	cond_resched*()

Hi!

> > That said, I do agree that maybe SYSTEM_RUNNING isn't the right check. 
> > Testing that the scheduler is initialized may be the more correct one. I 
> > think the SYSTEM_RUNNING one just comes from that being used for other 
> > debug issues.
> 
> Agreed.  system_state is too general.
> 
> If we specifically want to know whether it is safe to call schedule() then
> let's create a global boolean it_is_safe_to_call_schedule and test that,
> rather than testing something which indirectly and unreliably implies "it
> is safe to call schedule".  If that boolean already exists then no-brainer.

or maybe we could embed that check into schedule(), just returning
when scheduler is not ready?

And I always wondered... system_state is not protected by any kind of
lock and is not atomic_t... Does it all work by mistake?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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