On Mon, Sep 08, 2008 at 06:10:09PM +0900, FUJITA Tomonori wrote: > This patchset (against tip/master) fixes the problem that swiotlb > exhausts ZONE_DMA: > > http://lkml.org/lkml/2008/8/31/16 > > The root problem is that swiotlb_alloc_coherent always use ZONE_DMA, > which is fine for IA64 but not for x86_64. > > This patchset makes the callers set up the gfp flags so that > swiotlb_alloc_coherent can stop playing with the gfp flags. > > I think that it would be better to remove the allocation code in > swiotlb_alloc_coherent theoretically (what swiotlb should do is taking > care of the swiotlb memory. And swiotlb_alloc_coherent is not useful > since we use it only when we can't allocate memory reachable by the > device or we are in out of memory). But that code works for both x86 > and IA64 so it's not so bad, I guess. > > #1 is for IA64, #2-4 for x86, and #5 is for swiotlb. Cool :-) This is much better than our last two tries to solve this problem. Doing no gfp handling at all in swiotlb_alloc_coherent is a nice and clean solution. Joerg -- | AMD Saxony Limited Liability Company & Co. KG Operating | Wilschdorfer Landstr. 101, 01109 Dresden, Germany System | Register Court Dresden: HRA 4896 Research | General Partner authorized to represent: Center | AMD Saxony LLC (Wilmington, Delaware, US) | General Manager of AMD Saxony LLC: Dr. Hans-R. Deppe, Thomas McCoy -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
![]() |