linux-kernel - Re: Please revert 5adc55da4a7758021bcc374904b0f8b076508a11 (PCI_MULTITHREAD

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Message-ID: <20070509095302.GA13053@kroah.com>
Date:	Wed, 9 May 2007 02:53:02 -0700
From:	Greg KH <greg@...ah.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Please revert 5adc55da4a7758021bcc374904b0f8b076508a11
	(PCI_MULTITHREAD_PROBE)

On Tue, May 08, 2007 at 06:38:46PM +0200, Cornelia Huck wrote:
> On Tue, 8 May 2007 08:27:34 -0700 (PDT),
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > And no, we should not do it at the device core level. In fact, I don't 
> > think we should do it at that level at all. 
> > 
> > I'm pretty sure that the performance problems are at individual device 
> > drivers, and that the right solution is to thread at *that* level. Not 
> > higher up.
> 
> These are two different problems:
> 
> 1. Probing taking long for individual device drivers. I agree, this
> should be solved at the driver level.

For your bus perhaps, but not for PCI.

> 2. Sheer volume of devices on a bus. Even if the indivdual probing
> doesn't take long, having all devices probed one after the other may
> take a lot of time. Putting the actual probe on a thread makes it
> possible to run several probes in parallel, thereby cutting probing
> time.

Again, not for PCI, right?

If you want to implement this for your bus type, fine, I have no
objection to that at all, but not for PCI, it's just not worth it.

thanks,

greg k-h
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