Subject: + mm-document-improved-handling-of-swappiness==0.patch added to -mm tree
To: atomlin@xxxxxxxxxx,bmr@xxxxxxxxxx,rdunlap@xxxxxxxxxxxxx,riel@xxxxxxxxxx,satoru.moriya@xxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 24 Jan 2014 12:31:42 -0800
The patch titled
Subject: mm: document improved handling of swappiness==0
has been added to the -mm tree. Its filename is
mm-document-improved-handling-of-swappiness==0.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-document-improved-handling-of-swappiness==0.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-document-improved-handling-of-swappiness==0.patch
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From: Aaron Tomlin <atomlin@xxxxxxxxxx>
Subject: mm: document improved handling of swappiness==0
Prior to fe35004fbf9ea ("mm: avoid swapping out with swappiness==0")
setting swappiness to 0, reclaim code could still evict recently used user
anonymous memory to swap even though there is a significant amount of RAM
used for page cache.
The behaviour of setting swappiness to 0 has since changed. When set, the
reclaim code does not initiate swap until the amount of free pages and
file-backed pages, is less than the high water mark in a zone.
Let's update the documentation to reflect this.
Signed-off-by: Aaron Tomlin <atomlin@xxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Bryn M. Reeves <bmr@xxxxxxxxxx>
Cc: Satoru Moriya <satoru.moriya@xxxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/vm.txt | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN Documentation/sysctl/vm.txt~mm-document-improved-handling-of-swappiness==0 Documentation/sysctl/vm.txt
--- a/Documentation/sysctl/vm.txt~mm-document-improved-handling-of-swappiness==0
+++ a/Documentation/sysctl/vm.txt
@@ -696,7 +696,9 @@ swappiness
This control is used to define how aggressive the kernel will swap
memory pages. Higher values will increase agressiveness, lower values
-decrease the amount of swap.
+decrease the amount of swap. A value of 0 instructs the kernel not to
+initiate swap until the amount of free and file-backed pages, is less
+than the high water mark in a zone.
The default value is 60.
_
Patches currently in -mm which might be from atomlin@xxxxxxxxxx are
mm-document-improved-handling-of-swappiness==0.patch
mm-document-improved-handling-of-swappiness==0-fix.patch
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