linux-kernel - [PATCH] mm/zsmalloc.c: fix comment for get_pages_per

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Date:	Fri, 20 Mar 2015 07:43:17 +0000 (GMT)
From:	Yinghao Xie <yinghao.xie@...sung.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
	mm <linux-mm@...ck.org>, lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm/zsmalloc.c: fix comment for get_pages_per_zspage

Suggested-by: Minchan Kim <minchan@...nel.org>
Signed-off-by: Yinghao Xie <yinghao.xie@...sung.com>
---
 mm/zsmalloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 461243e..3e613cc 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -760,7 +760,8 @@ out:
  * to form a zspage for each size class. This is important
  * to reduce wastage due to unusable space left at end of
  * each zspage which is given as:
- *     wastage = Zp - Zp % size_class
+ *     wastage = Zp % class_size
+ *     usage = Zp - wastage
  * where Zp = zspage size = k * PAGE_SIZE where k = 1, 2, ...
  *
  * For example, for size class of 3/8 * PAGE_SIZE, we should
--
1.7.9.5