Re: [PATCH] mm/vmstat: Reduce zone lock hold time when reading /proc/pagetypeinfo

[Qian Cai]

> On Oct 24, 2019, at 1:34 AM, Feng Tang <feng.tang@xxxxxxxxx> wrote:
> 
> One example is, there was a platform with limited DRAM, so it preset
> some CMA memory for camera's big buffer allocation use, while it let 
> these memory to be shared by others when camera was not used. And
> after long time running, the cma region got fragmented and camera
> app started to fail due to the buffer allocation failure. And during
> debugging, we kept monitoring the buddy info for different migrate
> types.

For CMA-specific debugging, why CMA debugfs is not enough?