Subject: + mm-improve-the-description-for-dirty_background_ratio-dirty_ratio-sysctl.patch added to -mm tree
To: wenqing.lz@xxxxxxxxxx,rob@xxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 04 Nov 2013 13:44:48 -0800
The patch titled
Subject: mm: improve the description for dirty_background_ratio/dirty_ratio sysctl
has been added to the -mm tree. Its filename is
mm-improve-the-description-for-dirty_background_ratio-dirty_ratio-sysctl.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-improve-the-description-for-dirty_background_ratio-dirty_ratio-sysctl.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-improve-the-description-for-dirty_background_ratio-dirty_ratio-sysctl.patch
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------------------------------------------------------
From: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Subject: mm: improve the description for dirty_background_ratio/dirty_ratio sysctl
Now dirty_background_ratio/dirty_ratio contains a percentage of total
avaiable memory, which contains free pages and reclaimable pages. The
number of these pages is not equal to the number of total system memory.
But they are described as a percentage of total system memory in
Documentation/sysctl/vm.txt. So we need to fix them to avoid
misunderstanding.
Signed-off-by: Zheng Liu <wenqing.lz@xxxxxxxxxx>
Cc: Rob Landley <rob@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/vm.txt | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff -puN Documentation/sysctl/vm.txt~mm-improve-the-description-for-dirty_background_ratio-dirty_ratio-sysctl Documentation/sysctl/vm.txt
--- a/Documentation/sysctl/vm.txt~mm-improve-the-description-for-dirty_background_ratio-dirty_ratio-sysctl
+++ a/Documentation/sysctl/vm.txt
@@ -119,8 +119,11 @@ other appears as 0 when read.
dirty_background_ratio
-Contains, as a percentage of total system memory, the number of pages at which
-the background kernel flusher threads will start writing out dirty data.
+Contains, as a percentage of total available memory that contains free pages
+and reclaimable pages, the number of pages at which the background kernel
+flusher threads will start writing out dirty data.
+
+The total avaiable memory is not equal to total system memory.
==============================================================
@@ -151,9 +154,11 @@ interval will be written out next time a
dirty_ratio
-Contains, as a percentage of total system memory, the number of pages at which
-a process which is generating disk writes will itself start writing out dirty
-data.
+Contains, as a percentage of total available memory that contains free pages
+and reclaimable pages, the number of pages at which a process which is
+generating disk writes will itself start writing out dirty data.
+
+The total avaiable memory is not equal to total system memory.
==============================================================
_
Patches currently in -mm which might be from wenqing.lz@xxxxxxxxxx are
mm-improve-the-description-for-dirty_background_ratio-dirty_ratio-sysctl.patch
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