cma: redirect page allocation to CMA
CMA pages are designed to be used as fallback for movable allocations
and cannot be used for non-movable allocations. If CMA pages are
utilized poorly, non-movable allocations may end up getting starved if
all regular movable pages are allocated and the only pages left are
CMA. Always using CMA pages first creates unacceptable performance
problems. As a midway alternative, use CMA pages for certain
userspace allocations. The userspace pages can be migrated or dropped
quickly which giving decent utilization.
Change-Id: I6165dda01b705309eebabc6dfa67146b7a95c174
CRs-Fixed: 452508
[lauraa@codeaurora.org: Missing CONFIG_CMA guards, add commit text]
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 90980b7..6e12694 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -390,6 +390,7 @@
* process to make sure that the system is not starved.
*/
unsigned long min_cma_pages;
+ bool cma_alloc;
#endif
struct free_area free_area[MAX_ORDER];