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Subject[RFC][PATCH 1/2] Add explanation about min_free_kbytes to clarify its effect
Document that changing min_free_kbytes affects not only watermark[min]
but also watermark[low,high].

Signed-off-by: Satoru Moriya <>
Documentation/sysctl/vm.txt | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 30289fa..e10b279 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -349,7 +349,8 @@ min_free_kbytes:

This is used to force the Linux VM to keep a minimum number
of kilobytes free. The VM uses this number to compute a
-watermark[WMARK_MIN] value for each lowmem zone in the system.
+watermark[WMARK_MIN] for each lowmem zone and
+watermark[WMARK_LOW/WMARK_HIGH] for each zone in the system.
Each lowmem zone gets a number of reserved free pages based
proportionally on its size.


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