android/lowmemorykiller: Selectively count free CMA pages
In certain memory configurations there can be a large number of
CMA pages which are not suitable to satisfy certain memory
requests.
This large number of unsuitable pages can cause the
lowmemorykiller to not kill any tasks because the
lowmemorykiller counts all free pages.
In order to ensure the lowmemorykiller properly evaluates the
free memory only count the free CMA pages if they are suitable
for satisfying the memory request.
Change-Id: I7f06d53e2d8cfe7439e5561fe6e5209ce73b1c90
CRs-fixed: 437016
Signed-off-by: Liam Mark <lmark@codeaurora.org>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index b7a10fc..90980b7 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -61,6 +61,14 @@
MIGRATE_TYPES
};
+/*
+ * Returns a list which contains the migrate types on to which
+ * an allocation falls back when the free list for the migrate
+ * type mtype is depleted.
+ * The end of the list is delimited by the type MIGRATE_RESERVE.
+ */
+extern int *get_migratetype_fallbacks(int mtype);
+
#ifdef CONFIG_CMA
bool is_cma_pageblock(struct page *page);
# define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)