linux-kernel - Re: [linux-pm] Re: Hibernation considerations

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Message-Id: <200707231601.09541.rjw@sisk.pl>
Date:	Mon, 23 Jul 2007 16:01:07 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Miklos Szeredi <miklos@...redi.hu>, stern@...land.harvard.edu
Cc:	oliver@...kum.org, nigel@...el.suspend2.net, nigel@...pend2.net,
	jbms@....edu, miltonm@....com, ying.huang@...el.com,
	linux-kernel@...r.kernel.org, david@...g.hm,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [linux-pm] Re: Hibernation considerations

On Monday, 23 July 2007 15:08, Miklos Szeredi wrote:
> > > > The reason is that we want them to "park" in safe places, ie. where there
> > > > are no locks held etc.  Thus, these safe places need to be chosen somehow
> > > > and since they are not marked throughout the code, we choose the obvious
> > > > one. :-)
> > > 
> > > Why shouldn't locks be held?
> > > 
> > > No locks which are required for suspend must be held, sure.  But
> > > otherwise holding locks doesn't matter at all.
> > 
> > If you can provide a way to tell them apart, this would work.
> 
> Without some marking we can't tell obviously.
> 
> Are there many such locks?  We can easily check by adding some
> debugging code to the lock primitives, to make them yell if they are
> used during suspend.

This way we can only obtain information from systems that use hibernation
quite often.

Alan has recently proposed to introduce "suspend locks" to be acquired during
a suspend/hibernation and such that we can leave uninterruptible tasks that
don't hold any of them.

Unfortunately, I have no link to his original message at hand.

Greetings,
Rafael


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