[PATCH 2/2] arm: multi_v7_defconfig: Enable KSM.

[PATCH 2/2] arm: multi_v7_defconfig: Enable KSM.

[Daniel Díaz]

As per the documentation, Kernel Samepage Merging (available
since 2.6.32) is a memory-saving de-duplication feature,
enabled by CONFIG_KSM=y and activated via sysfs. More
information can be found here:
  https://www.kernel.org/doc/Documentation/vm/ksm.txt

When enabled in the kernel, the default is to not do anything
at all, until it is activated at run-time with:
  echo 1 > /sys/kernel/mm/ksm/run

Signed-off-by: Daniel D?az <daniel.diaz@linaro.org>
---
 arch/arm/configs/multi_v7_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/configs/multi_v7_defconfig b/arch/arm/configs/multi_v7_defconfig
index 7e1c543..79eedf4d 100644
--- a/arch/arm/configs/multi_v7_defconfig
+++ b/arch/arm/configs/multi_v7_defconfig
@@ -133,6 +133,7 @@ CONFIG_SMP=y
 CONFIG_NR_CPUS=16
 CONFIG_HIGHPTE=y
 CONFIG_CMA=y
+CONFIG_KSM=y
 CONFIG_SECCOMP=y
 CONFIG_ARM_APPENDED_DTB=y
 CONFIG_ARM_ATAG_DTB_COMPAT=y
-- 
2.7.4

[PATCH 2/2] arm: multi_v7_defconfig: Enable KSM.

[Geert Uytterhoeven]

Hi Daniel,

Thanks for your patch!

On Fri, Jun 15, 2018 at 12:52 AM Daniel D?az <daniel.diaz@linaro.org> wrote:
> As per the documentation, Kernel Samepage Merging (available
> since 2.6.32) is a memory-saving de-duplication feature,
> enabled by CONFIG_KSM=y and activated via sysfs. More
> information can be found here:
>   https://www.kernel.org/doc/Documentation/vm/ksm.txt
>
> When enabled in the kernel, the default is to not do anything
> at all, until it is activated at run-time with:
>   echo 1 > /sys/kernel/mm/ksm/run

So that's the "what" part.

Why is it good to have this in multi_v7_defconfig, which is meant to ease
(compile)testing for as many supported ARM v7 SoCs as possible?

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds