If a class size is power of 2 then it wastes no memory
and the best configuration is 1 physical page per-zspage.
Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
---
mm/zsmalloc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index effe10fe76e9..ee8431784998 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -2287,6 +2287,9 @@ static int calculate_zspage_chain_size(int class_size)
int i, min_waste = INT_MAX;
int chain_size = 1;
+ if (is_power_of_2(class_size))
+ return chain_size;
+
for (i = 1; i <= ZS_MAX_PAGES_PER_ZSPAGE; i++) {
int waste;
--
2.39.0.314.g84b9a713c41-goog
