linux-kernel - [PATCH 2/2] Documentation: clarify in calculating zone protection

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Message-Id: <1440511291-3990-2-git-send-email-bywxiaobai@163.com>
Date:	Tue, 25 Aug 2015 22:01:31 +0800
From:	Yaowei Bai <bywxiaobai@....com>
To:	akpm@...ux-foundation.org, mgorman@...e.de, vbabka@...e.cz,
	mhocko@...nel.org, js1304@...il.com, hannes@...xchg.org,
	alexander.h.duyck@...hat.com, sasha.levin@...cle.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] Documentation: clarify in calculating zone protection

Every zone's protection is calculated from managed_pages not
present_pages, to avoid misleading, correct it.

Signed-off-by: Yaowei Bai <bywxiaobai@....com>
---
 Documentation/sysctl/vm.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 9832ec5..1739b31 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -349,7 +349,7 @@ zone[i]'s protection[j] is calculated by following expression.
 
 (i < j):
   zone[i]->protection[j]
-  = (total sums of present_pages from zone[i+1] to zone[j] on the node)
+  = (total sums of managed_pages from zone[i+1] to zone[j] on the node)
     / lowmem_reserve_ratio[i];
 (i = j):
    (should not be protected. = 0;
@@ -360,7 +360,7 @@ The default values of lowmem_reserve_ratio[i] are
     256 (if zone[i] means DMA or DMA32 zone)
     32  (others).
 As above expression, they are reciprocal number of ratio.
-256 means 1/256. # of protection pages becomes about "0.39%" of total present
+256 means 1/256. # of protection pages becomes about "0.39%" of total managed
 pages of higher zones on the node.
 
 If you would like to protect more pages, smaller values are effective.
-- 
1.9.1


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