Xen devel - Apr 2005 - /sbin/hotplug exec''d lots of times during boot

hi,

I just added a printk to do_execve() in xenolinux0, and noticed that 
/sbin/hotplug is being exec''ed more than a hundred times during boot, 
and that this happens before /sbin/init is exec''ed.

This is with a version of xen-unstable less than one month old. It is 
probably a Linux issue, I was just wondering if anyone else had seen the 
same behaviour, and if this is supposed to happen (these days you never 
know)? Could it be the USB subsystem is acting weird?

thanks,
Jacob

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* Jacob Gorm Hansen (jacobg@diku.dk) wrote:
> I just added a printk to do_execve() in xenolinux0, and noticed that 
> /sbin/hotplug is being exec''ed more than a hundred times during
boot,
> and that this happens before /sbin/init is exec''ed.
This sounds pretty normal for Linux.  Each kobject_add can generate a
hotplug event, and execve("/sbin/init") happens quite late during
bootup.

thanks,
-chris

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Chris Wright wrote:
> * Jacob Gorm Hansen (jacobg@diku.dk) wrote:
> 
>>I just added a printk to do_execve() in xenolinux0, and noticed that 
>>/sbin/hotplug is being exec''ed more than a hundred times during
boot,
>>and that this happens before /sbin/init is exec''ed.
> 
> 
> This sounds pretty normal for Linux.  Each kobject_add can generate a
> hotplug event, and execve("/sbin/init") happens quite late during
bootup.
No wonder it is slow to boot then ;-) ... How can one be sure that the 
/sbin/hotplugs are no longer running when /sbin/init runs, i.e. that 
init has pid==1? Are there no forks allowed in /sbin/hotplug?

thanks,
Jacob

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* Jacob Gorm Hansen (jacobg@diku.dk) wrote:
> Chris Wright wrote:
> >* Jacob Gorm Hansen (jacobg@diku.dk) wrote:
> >
> >>I just added a printk to do_execve() in xenolinux0, and noticed
that
> >>/sbin/hotplug is being exec''ed more than a hundred times
during boot,
> >>and that this happens before /sbin/init is exec''ed.
> >
> >
> >This sounds pretty normal for Linux.  Each kobject_add can generate a
> >hotplug event, and execve("/sbin/init") happens quite late
during bootup.
> 
> No wonder it is slow to boot then ;-) ... How can one be sure that the 
> /sbin/hotplugs are no longer running when /sbin/init runs, i.e. that 
> init has pid==1? Are there no forks allowed in /sbin/hotplug?
pid == 1 starts long before is execs itself into /sbin/init.

thanks,
-chris

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