Now cma reclaims too many pages by __reclaim_pages which says
following as
* Reclaim enough pages to make sure that contiguous allocation
* will not starve the system.
Starve? What does it starve the system? The function which allocate
free page for migration target would wake up kswapd and do direct reclaim
if needed during migration so system doesn't starve.
Let remove __reclaim_pages and related function and fields.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>