Hotplug SIG

Hotplug SIG

[Silbermann, Martine]

Hi,

My name is Martine Silbermann and I represent HP at OSDL. I recently
joined this list because OSDL has created a new SIG (Special Interest
Group) for HotPlug. The difference between a SIG and regular OSDL groups
is that SIGs are open to everyone (no need to sign a 6 page agreement if
you want to join :-) While I would encourage everyone to join, this mail
is not a recruiting speech but a request for your help.

The first goal of the SIG is to determine how we can help the community.
I know that a lot of work has already been done in each of the hotplug
areas and we are reaching out to all the "hotplug groups" right now to
try to figure out where we could be most helpful.  As the SIG gets more
educated about the needs of the community we will publish a charter
detailing our goals. As the SIG leader I will make it a point to keep
you inform through the existing mailing lists of our progress and come
to you with questions/comments/discussions.

For those of you unfamiliar with the concept of OSDL SIGs, they are
temporary groups created to work on specific areas i.e we'll figure out
what needs to be done, write code for it, get it submitted and accepted,
provide documentation when required and disband.

After this lengthy introduction here is my request to you:
If there are any tasks or features that you would like to get done but
don't have the time or resource to do them yourself or within your group
please let us know. Again right now the SIG is reaching out to everyone
but as we get more educated we will only focus on what needs to be done.
Also remember that a lot of OSDL members are vendors and as such have
access to prototype hardware for testing.
Also if you have suggestions on how to run the SIG to help you as a
community like promoting face 2 face meetings or taking advantage of
OSDL's labs please let me know.

Thanks for your help.
Martine


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Re: Hotplug SIG

[Greg KH]

Ah, what a cross-post of lists :(

On Thu, Aug 12, 2004 at 11:35:22AM -0400, Silbermann, Martine wrote:
> 
> After this lengthy introduction here is my request to you:
> If there are any tasks or features that you would like to get done but
> don't have the time or resource to do them yourself or within your group
> please let us know.

Documentation.  I know the linux-hotplug core documentation is woefully
out of date.  It, and the pci hotplug documentation (which is
non-existant) could really use a good technical writer to create,
update, and maintain it.

Does that sound doable by your group?

thanks,

greg k-h


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Re: Hotplug SIG

[Dave Hansen]

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: Hotplug SIG

[Linas Vepstas]

Hi,

> 1. Documentation and more documentation.

Yes, please.

> 2. Constant regression testing.  As not a lot of people have hardware 
> that supports various hotplug and they are not enabled by default new 
> features tend to break them.

Yes.

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.   

-- 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.

-- 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.


Linas.



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