Date: Wed, 15 Sep 2004 15:25:57 -0700
From: Greg KH <greg@kroah.com>
To: Andrea Arcangeli <andrea@novell.com>
Cc: Chris Friesen <cfriesen@nortelnetworks.com>, "Marco d'Itri" <md@Linux.IT>,
       "Giacomo A. Catenazzi" <cate@pixelized.ch>,
       linux-kernel@vger.kernel.org
Subject: Re: udev is too slow creating devices
Message-ID: <20040915222557.GE26591@kroah.com>
References: <20040914213506.GA22637@kroah.com> <20040914214552.GA13879@wonderland.linux.it> <20040914215122.GA22782@kroah.com> <20040914224731.GF3365@dualathlon.random> <20040914230409.GA23474@kroah.com> <20040914232011.GG3365@dualathlon.random> <20040915161541.GD21971@kroah.com> <20040915192134.GA4197@dualathlon.random> <4148BD97.1080504@nortelnetworks.com> <20040915221523.GG15426@dualathlon.random>
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On Thu, Sep 16, 2004 at 12:15:23AM +0200, Andrea Arcangeli wrote:
> 
> But the microcode driver has nothing to do with hotplug or usb, and
> waiting for the device creation in the insmod syscall is sure natural
> and doable.  Now if we don't want to create a little bit of API in udev
> to let insmod provide a sync behaviour and force people into the dev.d
> scripts and file locking in /var/run that it's one issue (you can aruge
> about higher perf), but there is a whole large class of devices that are
> not hot-pluggable and where the discovery is definitely synchronous,
> even common pci is fully sync in its discovery when you call
> pci_find_device/get_device.

That will be soon going away with my multi-threaded device discovery
work.  And I run pci hotplug boxes (and so do all of the PCMCIA/CardBus
users), so don't discard PCI from being a async bus type :)

Async is now the norm, and drivers like the microcode module are the
exception.

thanks,

greg k-h
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