Regarding to CPU hotplug

Regarding to CPU hotplug

[Omprakash Vishnoi]

 Hi All,
       I read the doc. Linux Symposium "Udev-A userspace implementation of
devfs",there i understood,i have to make   rulefile in "/etc/udev/rule.d/"
for CPU  hotplug,but how can i know which CPU getting add or
removed.Acctually       as in my project,we want notification for CPU's
getting remove or add at user  level.

      pls tell me what procedure i have to follow,And how can i know which
CPU getting remove or add.

Regards
Omprakash Vishnoi



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Re: Regarding to CPU hotplug

[Greg KH]

On Mon, Sep 10, 2007 at 10:49:52AM +0530, Omprakash Vishnoi wrote:
> 
>  Hi All,
>        I read the doc. Linux Symposium "Udev-A userspace implementation of
> devfs",there i understood,i have to make   rulefile in "/etc/udev/rule.d/"
> for CPU  hotplug,but how can i know which CPU getting add or
> removed.Acctually       as in my project,we want notification for CPU's
> getting remove or add at user  level.
> 
>       pls tell me what procedure i have to follow,And how can i know which
> CPU getting remove or add.

I think you can just listen for the dbus events coming from HAL that
show the cpus going up and down.  Have you tried looking at the events
that happen when you do this to the machine?

thanks,

greg k-h

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Re: Regarding to CPU hotplug

[Omprakash Vishnoi]

Hi Greg,

        I m talking about user space,can u tell me how can i listen dbus
event,How can i see event coming from HAL i don't know,can u tell me please
in broad way.No i didn't try to those event.I know only about /udev/
directory and how to write rule in rule.d directory.

pls tell me what is the approch should i prefer.

Best Regards
Omprakash Vishnoi



                                                                           
             Greg KH                                                       
             <greg@kroah.com>                                              
                                                                        To 
             10/09/2007 12:43          Omprakash Vishnoi/India/IBM@IBMIN   
                                                                        cc 
                                       linux-hotplug-devel@lists.sourcefor 
                                       ge.net                              
                                                                   Subject 
                                       Re: Regarding to CPU hotplug        
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




On Mon, Sep 10, 2007 at 10:49:52AM +0530, Omprakash Vishnoi wrote:
>
>  Hi All,
>        I read the doc. Linux Symposium "Udev-A userspace implementation
of
> devfs",there i understood,i have to make   rulefile in
"/etc/udev/rule.d/"
> for CPU  hotplug,but how can i know which CPU getting add or
> removed.Acctually       as in my project,we want notification for CPU's
> getting remove or add at user  level.
>
>       pls tell me what procedure i have to follow,And how can i know
which
> CPU getting remove or add.

I think you can just listen for the dbus events coming from HAL that
show the cpus going up and down.  Have you tried looking at the events
that happen when you do this to the machine?

thanks,

greg k-h



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Re: Regarding to CPU hotplug

[Greg KH]

A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?


On Mon, Sep 10, 2007 at 01:54:46PM +0530, Omprakash Vishnoi wrote:
> Hi Greg,
> 
>         I m talking about user space,can u tell me how can i listen dbus
> event,How can i see event coming from HAL

dbus and HAL are userspace things, go see their documentation for how to
do this properly, it is not a kernel issue.

> i don't know,can u tell me please in broad way.No i didn't try to
> those event.I know only about /udev/ directory and how to write rule
> in rule.d directory.
> 
> pls tell me what is the approch should i prefer.

Do whatever works properly for you :)

good luck,

greg k-h

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Re: Regarding to CPU hotplug

[Kay Sievers]

On 9/10/07, Omprakash Vishnoi <ovishnoi@in.ibm.com> wrote:
>        I read the doc. Linux Symposium "Udev-A userspace implementation of
> devfs",there i understood,i have to make   rulefile in "/etc/udev/rule.d/"
> for CPU  hotplug,but how can i know which CPU getting add or
> removed.Acctually       as in my project,we want notification for CPU's
> getting remove or add at user  level.
>
>       pls tell me what procedure i have to follow,And how can i know which
> CPU getting remove or add.

Run:
  udevmonitor --env
while adding/removing a CPU. What does it print?

Kay

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