RE: [ACPI] Fix S3 on athlon systems

[Kimio S. <k-s...@mv...>]

Hi all,

> Actually, it's looking like it's not that bad. Some things need to be
> integrated so everything flows a little better, but I think most of the
> dirty work is done.
>
> Basically, you get yourself down to 1 processor at the beginning of the
> suspend process. You can do that via the hotplug CPU patches:
>
> http://sourceforge.net/projects/lhcs/
>
> They're a bit outdated, but if anyone is interested, Randy up-ported the
> patches to 2.4.14(?) and one of us will probably do it for 2.5.x.

I'm now making the patch for 2.5.0 and am expecting to send it in
couple of days.

> Based on some rumors that I heard, the x86 CPU "drivers" will be
> getting a
> bit of a makeover. If we could some how massage them into either the
> device tree or a parallel tree, they could use a lot of the same code to
> do suspend/resume. (Same thing for APICs and other board-level control
> devices).
>
> With application CPUs, I wouldn't worry about saving state. Just schedule
> everything off the processor and send the IPI to shut it down (I don't
> remember the name ATM). When we come back up, bootstrap all the
> application CPUs and start scheduling on them.

Ummm, the hotplug CPU patch for x86 does have functions of
CPU online/offline, but no CPU hot-add/remove functions.
So, I suspect it can not be used just as it is.
I'm now developing hot-add/remove functions for IA-64, but
have no plan to implement it on x86 platforms.

Regards,
Kimi

-- 
Kimio Suganuma <k-s...@mv...>