On Wed, 08 Feb 2012 03:04:18 +0100, sandeep patil <psandee...@gmail.com> wrote:
There's another problem I am facing with zone watermarks and CMA.
Test details:
Memory : 480 MB of total memory, 128 MB CMA region
Test case : around 600 MB of file transfer over USB RNDIS onto target
System Load : ftpd with console running on target.
No one is doing CMA allocations except for the DMA allocations done by the
drivers.
Result : After about 300MB transfer, I start getting GFP_ATOMIC
allocation failures. This only happens if CMA region is reserved.
[...]
Total memory available is way above the zone watermarks. So, we ended
up starving
UNMOVABLE/RECLAIMABLE atomic allocations that cannot fallback on CMA region.
This looks like something Mel warned me about. I don't really have a good
solution for that yet. ;/
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