Re: [linux-pm] [PATCH -mm 2/2]: PM: SMP-safe freezer

[David Brownell <david-b@pacbell.net>]

[ off $SUBJECT ]

On Monday 04 December 2006 11:44 am, Pavel Machek wrote:
> > But I think I'll need to add TIF_FROZEN for all architectures, because suspend
> > to RAM is supposed to work on all of them, isn't it?
> 
> Well, yes, it should be added, but no, I do not think s2ram works on
> that many machines.

Userspace "s2ram" != PM_SUSPEND_MEM ("suspend-to-RAM") though.

I'm not even sure there's a globally acceptable definition of
what PM_SUSPEND_MEM indicates, beyond the fact that one expects
it saves more power than PM_SUSPEND_STANDBY.

Yes, the Documentation/power/states.txt regurgitates ACPI spec text.
But lots of non-ACPI systems don't have any reason to do things
like ACPI says.  And in terms of latency, I've seen a lot of that
be due to the PM framework taking so long to walk the device tree,
with no substantial difference between "standby" and "str" costs.

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