linux-kernel - Re: [PATCH]iommu-iotlb-flushing

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Message-ID: <20080301055455.GB20032@kroah.com>
Date:	Fri, 29 Feb 2008 21:54:55 -0800
From:	Greg KH <greg@...ah.com>
To:	mark gross <mgross@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: [PATCH]iommu-iotlb-flushing

On Fri, Feb 29, 2008 at 03:18:41PM -0800, mark gross wrote:
> > > --- linux-2.6.24-mm1.orig/Documentation/kernel-parameters.txt	2008-02-12 07:12:06.000000000 -0800
> > > +++ linux-2.6.24-mm1/Documentation/kernel-parameters.txt	2008-02-13 11:17:22.000000000 -0800
> > > @@ -822,6 +822,10 @@
> > >  			than 32 bit addressing. The default is to look
> > >  			for translation below 32 bit and if not available
> > >  			then look in the higher range.
> > > +		strict [Default Off]
> > > +			With this option on every unmap_single operation will
> > > +			result in a hardware IOTLB flush operation as opposed
> > > +			to batching them for performance.
> > 
> > boot-time options suck.  Is it not possible to tweak this at runtime?
> 
> Yes, I could easily create a sysfs or debugfs mechanism for turning it
> on / off at run time.  I would like input on the preferred way to do this.
> sysfs or debugfs?

Which is it, a debugging option, or something that anyone would want to
change?  If debugging, make it a debugfs file.  Otherwise sysfs if fine,
but be sure to add a Documentation/ABI/ file for it.

thanks,

greg k-h
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