[lkml]   [2008]   [Sep]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 0/5] fix exhaustion of ZONE_DMA with swiotlb (in x86 tree)
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:
> 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


| 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

 \ /
  Last update: 2008-09-08 14:03    [W:0.057 / U:7.356 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site