The patch titled
Subject: mm: add config option to select the initial overcommit mode
has been added to the -mm tree. Its filename is
mm-add-config-option-to-select-the-initial-overcommit-mode.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-config-option-to-select-the-initial-overcommit-mode.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-config-option-to-select-the-initial-overcommit-mode.patch
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------------------------------------------------------
From: Sebastian Frias <sf84@xxxxxxxxxxx>
Subject: mm: add config option to select the initial overcommit mode
Currently the initial value of the overcommit mode is OVERCOMMIT_GUESS.
However, on embedded systems it is usually better to disable overcommit to
avoid waking up the OOM-killer and its well known undesirable
side-effects.
This config option allows to setup the initial overcommit mode to any of
the 3 available values, OVERCOMMIT_GUESS (which remains as default),
OVERCOMMIT_ALWAYS and OVERCOMMIT_NEVER. The overcommit mode can still be
changed thru sysctl after the system boots up.
This config option depends on CONFIG_EXPERT.
This patch does not introduces functional changes.
Link: http://lkml.kernel.org/r/5731CC6E.3080807@xxxxxxxxxxx
Signed-off-by: Sebastian Frias <sf84@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Kconfig | 32 ++++++++++++++++++++++++++++++++
mm/util.c | 6 ++++++
2 files changed, 38 insertions(+)
diff -puN mm/Kconfig~mm-add-config-option-to-select-the-initial-overcommit-mode mm/Kconfig
--- a/mm/Kconfig~mm-add-config-option-to-select-the-initial-overcommit-mode
+++ a/mm/Kconfig
@@ -438,6 +438,38 @@ choice
benefit.
endchoice
+choice
+ prompt "Overcommit Mode"
+ default OVERCOMMIT_GUESS
+ depends on EXPERT
+ help
+ Selects the initial value for Overcommit mode.
+
+ NOTE: The overcommit mode can be changed dynamically through sysctl.
+
+ config OVERCOMMIT_GUESS
+ bool "Guess"
+ help
+ Selecting this option forces the initial value of overcommit mode to
+ "Guess" overcommits. This is the default value.
+ See Documentation/vm/overcommit-accounting for more information.
+
+ config OVERCOMMIT_ALWAYS
+ bool "Always"
+ help
+ Selecting this option forces the initial value of overcommit mode to
+ "Always" overcommit.
+ See Documentation/vm/overcommit-accounting for more information.
+
+ config OVERCOMMIT_NEVER
+ bool "Never"
+ help
+ Selecting this option forces the initial value of overcommit mode to
+ "Never" overcommit.
+ See Documentation/vm/overcommit-accounting for more information.
+
+endchoice
+
#
# UP and nommu archs use km based percpu allocator
#
diff -puN mm/util.c~mm-add-config-option-to-select-the-initial-overcommit-mode mm/util.c
--- a/mm/util.c~mm-add-config-option-to-select-the-initial-overcommit-mode
+++ a/mm/util.c
@@ -417,7 +417,13 @@ int __page_mapcount(struct page *page)
}
EXPORT_SYMBOL_GPL(__page_mapcount);
+#if defined(CONFIG_OVERCOMMIT_NEVER)
+int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_NEVER;
+#elif defined(CONFIG_OVERCOMMIT_ALWAYS)
+int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_ALWAYS;
+#else
int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_GUESS;
+#endif
int sysctl_overcommit_ratio __read_mostly = 50;
unsigned long sysctl_overcommit_kbytes __read_mostly;
int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
_
Patches currently in -mm which might be from sf84@xxxxxxxxxxx are
mm-add-config-option-to-select-the-initial-overcommit-mode.patch
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