On Tuesday 03 November 2015 07:13:28 Benjamin Herrenschmidt wrote: > On Mon, 2015-11-02 at 14:07 +0200, Shamir Rabinovitch wrote: > > On Mon, Nov 02, 2015 at 09:00:34PM +1100, Benjamin Herrenschmidt > > wrote: > > > > > > Chosing on a per-mapping basis *in the back end* might still make > > > some > > > > In my case, choosing mapping based on the hardware that will use this > > mappings makes more sense. Most hardware are not that performance > > sensitive as the Infiniband hardware. > > ... > > > The driver know for what hardware it is mapping the memory so it know > > if the memory will be used by performance sensitive hardware or not. > > Then I would argue for naming this differently. Make it an optional > hint "DMA_ATTR_HIGH_PERF" or something like that. Whether this is > achieved via using a bypass or other means in the backend not the > business of the driver. > With a name like that, who wouldn't pass that flag? ;-) Arnd -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
