On Thu, 2015-03-26 at 16:00 -0700, David Miller wrote: > From: cascardo@xxxxxxxxxxxxxxxxxx > Date: Wed, 25 Mar 2015 21:43:42 -0300 > > > On Mon, Mar 23, 2015 at 10:15:08PM -0400, David Miller wrote: > >> From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> > >> Date: Tue, 24 Mar 2015 13:08:10 +1100 > >> > >> > For the large pool, we don't keep a hint so we don't know it's > >> > wrapped, in fact we purposefully don't use a hint to limit > >> > fragmentation on it, but then, it should be used rarely enough that > >> > flushing always is, I suspect, a good option. > >> > >> I can't think of any use case where the largepool would be hit a lot > >> at all. > > > > Well, until recently, IOMMU_PAGE_SIZE was 4KiB on Power, so every time a > > driver mapped a whole 64KiB page, it would hit the largepool. > > We don't plan to ever use 64KB page size on sparc64, so I think we're > safe there. > > There are many reasons using 64KB pages is really stupid, what you > see here with the IOMMU stuff is just one of many symptoms, but I bet > your powerpc guys are kind of sick of hearing it by now... :-) Lalalala :-) Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
