Don't use CMA pages for page cache

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Hi  Laura,

I notice this commit 

commit c1da80bfb0ce5f213b67e2aeeda885f63eb97d7d
mm: Don't use CMA pages for page cache

I  have a question about this change,
Why don't  use CMA page for page_cache alloc?
These pages are movable ,
So it can be replaced by other pages if system
Need reclaim cma pages ,
If we don't use cma pages for page_cache page,
Cma page will be not used if there is not enough 
Normal Free memory , but there are lots of cma pages.

Will have oom sometimes, especially in page reclaim
Call path .

Thanks



Wang Yalin
Engineer
OSDD

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