linux-kernel - Re: [PATCH 00/11] nested sleeps, fixes and debug infrastructure

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Message-ID: <20141029113655.GD10476@twins.programming.kicks-ass.net>
Date:	Wed, 29 Oct 2014 12:36:55 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>, mingo@...nel.org,
	torvalds@...ux-foundation.org, tglx@...utronix.de,
	ilya.dryomov@...tank.com, linux-kernel@...r.kernel.org,
	Eric Paris <eparis@...hat.com>, rafael.j.wysocki@...el.com
Subject: Re: [PATCH 00/11] nested sleeps, fixes and debug infrastructure

On Wed, Oct 29, 2014 at 12:31:03PM +0100, Peter Zijlstra wrote:
> On Wed, Oct 29, 2014 at 10:35:03AM +0100, Peter Zijlstra wrote:
> > On Wed, Oct 29, 2014 at 01:00:56AM +0100, Oleg Nesterov wrote:
> 
> > > But what if it calls try_to_freeze() and another thread (which should
> > > be frozen too) sleeps in kthread_stop() ?
> > 
> > Fair point indeed. Now I had a look at __refrigerator() and is there any
> > reason we should not remove that .check_kthr_stop argument and replace
> > it with an unconditional (current->flags & PF_KTHREAD) ?
> 
> Hmm, doesn't kthread_freezable_should_stop() suffer the same problem? It
> should not refrigerate when should_stop.

Oh never you mind, i've got my head on backwards it seems, it uses
__refrigerator(.check_kthr_stop = true), which does another should_stop
test.
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