Re: [RFC][PATCH -mm][Experimental] swsusp: freeze userspace processes first

Nigel Cunningham
2006-02-01T11:18:59Z

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Hi.

On Wednesday 01 February 2006 20:55, Pavel Machek wrote:
> Hi!
>
> > This is an experimantal patch aimed at the "unable to freeze processes
> > under load" problem.
> >
> > On my box the 2.6.16-rc1-mm4 kernel with this patch applied survives the
> > "dd if=/dev/hda of=/dev/null" test.
>
> What filesystem? ext2 vs. ext3 is very different. I can fix ext2 by
> just upping the timeout. ext3 is harder, because of the journalling
> thread. Maybe I'll take the sledgehammer approach and just freeze all
> the user tasks first... I tried to do the "small" approach and just
> fix the journalling code...
>
> I'm not sure what problem the usermodehelper code is trying to
> solve... why are usermodehelpers special?

This is related to the 'Hotplug events during sleep transition' thread from
the PM list from December.

Regards,

Nigel

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