Messages in this thread Patch in this message | | | From | Ben Gamari <> | Subject | [PATCH] Add Kconfig option for default swappiness | Date | Mon, 1 Nov 2010 23:20:52 -0400 |
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This will allow distributions to tune this important vm parameter in a more self-contained manner.
Signed-off-by: Ben Gamari <bgamari.foss@gmail.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Wu Fengguang <fengguang.wu@intel.com> --- Documentation/sysctl/vm.txt | 2 +- mm/Kconfig | 14 ++++++++++++++ mm/vmscan.c | 2 +- 3 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 30289fa..d159d02 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -643,7 +643,7 @@ 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. -The default value is 60. +The default value is 60 (changed with CONFIG_DEFAULT_SWAPINESS). ============================================================== diff --git a/mm/Kconfig b/mm/Kconfig index c2c8a4a..dc23737 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -61,6 +61,20 @@ config SPARSEMEM_MANUAL endchoice +config DEFAULT_SWAPPINESS + int "Default swappiness" + default "60" + range 0 100 + help + 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. Valid values range from 0 to 100. + + This only sets the default value at boot. Swappiness can be set at + runtime through /proc/sys/vm/swappiness. + + If unsure, keep default value of 60. + config DISCONTIGMEM def_bool y depends on (!SELECT_MEMORY_MODEL && ARCH_DISCONTIGMEM_ENABLE) || DISCONTIGMEM_MANUAL diff --git a/mm/vmscan.c b/mm/vmscan.c index b8a6fdc..d9f5bba 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -133,7 +133,7 @@ struct scan_control { /* * From 0 .. 100. Higher means more swappy. */ -int vm_swappiness = 60; +int vm_swappiness = CONFIG_DEFAULT_SWAPPINESS; long vm_total_pages; /* The total number of pages which the VM controls */ static LIST_HEAD(shrinker_list); -- 1.7.1
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