diff mbox series

[2/4] zsmalloc: skip chain size calculation for pow_of_2 classes

Message ID 20230105053510.1819862-3-senozhatsky@chromium.org (mailing list archive)
State New
Headers show
Series zsmalloc: make zspage chain size configurable | expand

Commit Message

Sergey Senozhatsky Jan. 5, 2023, 5:35 a.m. UTC 
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@chromium.org>
---
 mm/zsmalloc.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 959126e708a3..9a0f1963b803 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -2290,6 +2290,9 @@  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;