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Message-Id: <20230118005210.2814763-3-senozhatsky@chromium.org>
Date: Wed, 18 Jan 2023 09:52:08 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
Minchan Kim <minchan@...nel.org>
Cc: Mike Kravetz <mike.kravetz@...cle.com>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv3 2/4] zsmalloc: skip chain size calculation for pow_of_2 classes
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@...omium.org>
Acked-by: Minchan Kim <minchan@...nel.org>
---
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
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