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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