linux-kernel - Re: Hibernation Redesign

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Message-Id: <200707111427.27598.rjw@sisk.pl>
Date:	Wed, 11 Jul 2007 14:27:26 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	nigel@...el.suspend2.net, a1426z@...ab.com, jeremy@...p.org,
	jbms@....edu, pavel@....cz, nickpiggin@...oo.com.au,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: Hibernation Redesign

On Wednesday, 11 July 2007 14:09, Miklos Szeredi wrote:
> > > Freezing of tasks is slowing down suspend.  Don't know how serious
> > > this is, suspend is pretty fast, but could possibly be even faster.
> > 
> > It's FUD. Freezing of tasks normally takes next to no time. I've never 
> > understood the rediculously long timeout it has. If freezing succeeds, all 
> > processes are frozen within 1/2 a second tops. If it fails, nothing is going 
> > to change in the following 19.5 seconds (or whatever it is if I don't 
> > remember the value properly).
> 
> Right.  The 20s timeout is again a sign of brokenness.

Are you still serious?

> If we expect something to fail, it should fail immediately, without
> waiting for arbitrary timeouts.

I don't agree.  If you think so, then please tell me what the softlockup
infrastructure is for.

> And if we don't expect it to fail, why the timeout?

We know that it can fail, so we use the timeout to detect failures.
 
> Of course we know it can fail (network problems, etc), so it's wrong
> whatever way we look at it.

Are you trying to say that whatever can fail is wrong?

Greetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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