Re: [PATCH] mm: cma: free cma page to buddy instead of being cpuhot page

From: Laura Abbott
Date: Mon Oct 28 2013 - 12:04:16 EST

On 10/28/2013 4:42 AM, zhang.mingjun@xxxxxxxxxx wrote:
From: Mingjun Zhang <troy.zhangmingjun@xxxxxxxxxx>

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@xxxxxxxxxx>
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;

I submitted something very similar a while ago . Has the opinion on this patch changed?


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