On 2/5/21 1:52 PM, Suren Baghdasaryan wrote:

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I takes your suggestion something like this.

[alloc_range] could be order or range by interval

/sys/kernel/mm/cma/cma-A/[alloc_range]/success
/sys/kernel/mm/cma/cma-A/[alloc_range]/fail
..
..
/sys/kernel/mm/cma/cma-Z/[alloc_range]/success
/sys/kernel/mm/cma/cma-Z/[alloc_range]/fail

The interface above seems to me the most useful actually, if by
[alloc_range] you mean the different allocation orders. This would
cover Minchan's per-CMA failure tracking and would also allow us to
understand what kind of allocations are failing and therefore if the
problem is caused by pinning/fragmentation or by over-utilization.

I agree. That seems about right, now that we've established that
cma areas are a must-have.

thanks,
-- 
John Hubbard
NVIDIA