From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Nigel Cunningham <nigel@suspend2.net>
Subject: Re: [ 00/23] [Suspend2] Freezer Upgrade Patches
Date: Fri, 27 Jan 2006 13:18:01 +0100
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Cc: linux-kernel@vger.kernel.org, Pavel Machek <pavel@suse.cz>
References: <20060126034518.3178.55397.stgit@localhost.localdomain> <200601270010.22702.rjw@sisk.pl> <200601271404.08680.nigel@suspend2.net>
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Hi,

On Friday, 27 January 2006 05:04, Nigel Cunningham wrote:
> On Friday 27 January 2006 09:10, Rafael J. Wysocki wrote:
> > On Thursday, 26 January 2006 04:45, Nigel Cunningham wrote:
> > > Hi everyone.
> > >
> > > This set of patches represents the freezer upgrade patches from Suspend2.
> > >
> > > The key features of this changeset are:
> > >
> > > - Use of Christoph Lameter's todo list notifiers, which help with SMP
> > >   cleanness.
> > > - Splitting the freezing of kernel and userspace processes. Freezing
> > >   currently suffers from a race because userspace processes can be
> > >   submitting work for kernel threads, thereby stopping them from
> > >   responding to freeze messages in a timely manner. The freezer can
> > >   thus give up when it doesn't really need to. (This is not normally
> > >   a problem only because load is not usually high).
> >
> > Could you please describe specific situation?
> 
> The simplest example would be:
> 
> dd if=/dev/hda of=/dev/null
> echo disk > /sys/power/state

Well, I don't think it's a usual kind of workload. :-)

Anyway, could you please give some details?  I mean how exactly your patch
helps in this particular case?

Greetings,
Rafael
 
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