On 12/01/2016 08:21 AM, Michal Hocko wrote:
Forgot to CC Joonsoo. The email thread starts more or less here
http://lkml.kernel.org/r/20161130092239.GD18437@xxxxxxxxxxxxxx
On Thu 01-12-16 08:15:07, Michal Hocko wrote:
On Wed 30-11-16 20:19:03, Robin H. Johnson wrote:
[...]
> alloc_contig_range: [83f2a3, 83f2a4) PFNs busy
Huh, do I get it right that the request was for a _single_ page? Why do
we need CMA for that?
Ugh, good point. I assumed that was just the PFNs that it failed to migrate
away, but it seems that's indeed the whole requested range. Yeah sounds some
part of the dma-cma chain could be smarter and attempt CMA only for e.g. costly
orders.
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