/sbin/hotplug exec'd lots of times during boot

/sbin/hotplug exec'd lots of times during boot

[Jacob Gorm Hansen]

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

Re: /sbin/hotplug exec'd lots of times during boot

[Chris Wright]

* 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

Re: /sbin/hotplug exec'd lots of times during boot

[Jacob Gorm Hansen]

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

Re: /sbin/hotplug exec'd lots of times during boot

[Chris Wright]

* 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