On Fri, 18 Nov 2011 22:20:48 +0100, sandeep patil wrote:
So, i guess my question is, until all the migration failures are tracked down and fixed, is there a plan to retry the contiguous allocation from a new range in the CMA region?
2011/11/18 Michal Nazarewicz mina86@mina86.com:
No. Current CMA implementation will stick to the same range of pages also on consequent allocations of the same size.
On Sat, 19 Nov 2011 00:30:49 +0100, sandeep patil psandeep.s@gmail.com wrote:
Doesn't that mean the drivers that fail to allocate from contiguous DMA region will fail, if the migration fails?
Yes.
I have some ideas how that could be mitigated. The easiest would be to try another region to allocate from on failure. More complicated could be to try and wait for the I/O transfer to finish. I'll try to work on it during upcoming week.