linux-kernel - [PATCH] Documentation: incorrect formula to calculate CommitLimit value

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Message-ID: <1400760284.3145.15.camel@holly>
Date:	Thu, 22 May 2014 14:04:44 +0200
From:	Petr Oros <poros@...hat.com>
To:	rdunlap@...radead.org
Cc:	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	trivial@...nel.org
Subject: [PATCH] Documentation: incorrect formula to calculate CommitLimit
 value

The formula to calculate "CommitLimit" value mentioned in kernel documentation is incorrect.
Right formula is: CommitLimit = ([total RAM pages] - [total huge TLB pages]) * overcommit_ratio / 100 + [total swap pages]

Signed-off-by: Petr Oros <poros@...hat.com>
---
 Documentation/filesystems/proc.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 8b9cd8e..b58d764 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -854,7 +854,8 @@ WritebackTmp: Memory used by FUSE for temporary writeback buffers
               if strict overcommit accounting is enabled (mode 2 in
               'vm.overcommit_memory').
               The CommitLimit is calculated with the following formula:
-              CommitLimit = ('vm.overcommit_ratio' * Physical RAM) + Swap
+              CommitLimit = ([total RAM pages] - [total huge TLB pages]) *
+                             overcommit_ratio / 100 + [total swap pages]
               For example, on a system with 1G of physical RAM and 7G
               of swap with a `vm.overcommit_ratio` of 30 it would
               yield a CommitLimit of 7.3G.
-- 
1.9.0


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