linux-kernel - Re: [RFD] Freezing of kernel threads

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Message-Id: <200705132314.44688.rjw@sisk.pl>
Date:	Sun, 13 May 2007 23:14:43 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Gautham R Shenoy <ego@...ibm.com>, Pavel Machek <pavel@....cz>,
	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Paul E McKenney <paulmck@...ibm.com>
Subject: Re: [RFD] Freezing of kernel threads

On Sunday, 13 May 2007 22:49, Linus Torvalds wrote:
> 
> On Sun, 13 May 2007, Rafael J. Wysocki wrote:
> > 
> > Besides, the problems with interdependencies that we've had recently are
> > related specifically to the CPU hotplug.  To be precise, they are related to the
> > CPU hotplug notifiers that try to stop kernel threads which may be frozen.
> > The other interdependencies don't lead to freezer-related problems.
> 
> Sure they do. We've always had interdependencies and freezer-related 
> problems. That's why PF_NOFREEZE exists in the first place.

Okay, we've already discussed that.  I was referring to the recent problems
and I should have added "at present" to the last sentence. :-)

> Claiming this is somehow CPU hotplug-related is disingenious, since the 
> freezer hasn't even been used for that historically, yet clearly we *do* 
> have the NOFREEZE stuff.
> 
> Those kernel threads tend to exists for a reason. 

Agreed.

Greetings,
Rafael
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