RE: [Pcihpd-discuss] Re: Hotplug SIG

RE: [Pcihpd-discuss] Re: Hotplug SIG

[Silbermann, Martine]

Thanks Dave, I appreciate your input. 
We'll look into that and try to complement the ongoing efforts.
Martine

-----Original Message-----
From: pcihpd-discuss-admin@lists.sourceforge.net
[mailto:pcihpd-discuss-admin@lists.sourceforge.net] On Behalf Of Dave
Hansen
Sent: Thursday, August 12, 2004 3:52 PM
To: Silbermann, Martine
Cc: Hotplug CPU list; lhms; lhns-devel@lists.sourceforge.net;
pcihpd-discuss@lists.sourceforge.net; hotplug devel
Subject: [Pcihpd-discuss] Re: Hotplug SIG


On Thu, 2004-08-12 at 12:02, Silbermann, Martine wrote:
> In the past OSDL has mostly concentrated their efforts around storage 
> networking. However as of lately some other areas that are viewed as 
> crucial to the success of Linux are getting more attention. While 
> there has already been a lot of work done in the different hotplug 
> areas we felt that it was important that we become involved and offer 
> to help along where needed.

For my little corner of memory hotplug, we could seriously use some more
testing of the patch set that we're working on.  It's in its infancy,
quite immature and could use a much wider variety of testing, even with
all of our config options off.  As Matthew Wilcox noted, "hotplug memory
still needs a lot of work."

It's known to break some things like DISCONTIGMEM and NUMA badly, and
probably also breaks all of the architectures that we haven't been
working with. Patches to fix any of these or any other issues would be
very welcome.  

If this is something you are interested in, please check with the people
on lhms-devel@lists.sourceforge.net before doing too much work.  You
wouldn't want to duplicate something that anyone else is currently
developing.  

For now, the latest patch can be found here:

	 http://sprucegoose.sr71.net/patches/

Beware, that's not a permanent location.  But, I'll certainly send mail
out of it ever changes.  

-- Dave



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Re: [Pcihpd-discuss] Re: Hotplug SIG

[Greg KH]

On Mon, Aug 23, 2004 at 05:11:51PM -0500, Linas Vepstas wrote:
> 
> I am not aware of any single, unified, architecture-independent API
> or user-space tools for performing PCI hotplug.  If they do exist, 
> then my ignorance can be blamed on bad documentation.   

They exist:
	www.kroah.com/linux/hotplug

It's just the dumb ppc64 driver that breaks this tool, the last time I
tried it...

Oh, and I wrote a tiny bash script that also did the same thing, if you
don't like gtk code, if you search the archives.

> -- There's a command-line tool I use on powerpc that does things 
>    like blink LED's in order to better identify the PCI slot, so
>    that you don't actually remove the wrong card.   A generic 
>    tool that did this for all arches would be nice.

See the program mentioned above.

> -- Some people like to "echo 1 > /sys/bus/pci/something" to turn
>    power on and off for a given PCI slot, but its not obvious that
>    this is how all the various arches work; nor is it obvious 
>    how to match up a given 'geographical' slot location to a given
>    /sys/whatever entry.   So unifying all this would be nice.

That's a arch independant thing, actually, a system independant thing.
All the different hardware systems do it differently, but they all
export the information in the same way, so the above tool does get the
information properly.

thanks,

greg k-h


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