linux-kernel - [PATCH v2] zsmalloc: use class->pages_per

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Date:	Thu, 16 Jul 2015 09:10:54 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Minchan Kim <minchan@...nel.org>
Subject: [PATCH v2] zsmalloc: use class->pages_per_zspage

There is no need to recalcurate pages_per_zspage in runtime.
Just use class->pages_per_zspage to avoid unnecessary runtime
overhead.

* From v1
  * fix up __zs_compact - Sergey

Signed-off-by: Minchan Kim <minchan@...nel.org>
---
 mm/zsmalloc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 27b9661c8fa6..c9685bb2bb92 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1711,7 +1711,7 @@ static unsigned long zs_can_compact(struct size_class *class)
 	obj_wasted /= get_maxobj_per_zspage(class->size,
 			class->pages_per_zspage);
 
-	return obj_wasted * get_pages_per_zspage(class->size);
+	return obj_wasted * class->pages_per_zspage;
 }
 
 static void __zs_compact(struct zs_pool *pool, struct size_class *class)
@@ -1749,8 +1749,7 @@ static void __zs_compact(struct zs_pool *pool, struct size_class *class)
 
 		putback_zspage(pool, class, dst_page);
 		if (putback_zspage(pool, class, src_page) == ZS_EMPTY)
-			pool->stats.pages_compacted +=
-				get_pages_per_zspage(class->size);
+			pool->stats.pages_compacted += class->pages_per_zspage;
 		spin_unlock(&class->lock);
 		cond_resched();
 		spin_lock(&class->lock);
-- 
1.9.1

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