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Subject[PATCH] mm: cma: free cma page to buddy instead of being cpu hot page
Date
From: Mingjun Zhang <troy.zhangmingjun@linaro.org>

free_contig_range frees cma pages one by one and MIGRATE_CMA pages will be
used as MIGRATE_MOVEABLE pages in the pcp list, it causes unnecessary
migration action when these pages reused by CMA.

Signed-off-by: Mingjun Zhang <troy.zhangmingjun@linaro.org>
---
mm/page_alloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0ee638f..84b9d84 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1362,7 +1362,8 @@ void free_hot_cold_page(struct page *page, int cold)
* excessively into the page allocator
*/
if (migratetype >= MIGRATE_PCPTYPES) {
- if (unlikely(is_migrate_isolate(migratetype))) {
+ if (unlikely(is_migrate_isolate(migratetype))
+ || is_migrate_cma(migratetype))
free_one_page(zone, page, 0, migratetype);
goto out;
}
--
1.7.9.5


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