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... :-) -- 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
