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

Message ID 1529016629-2948-2-git-send-email-daniel.diaz@linaro.org
State New
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Series
  • [1/2] x86: x86_64_defconfig: Enable KSM.
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Commit Message

Daniel Díaz June 14, 2018, 10:50 p.m.
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 Díaz <daniel.diaz@linaro.org>

---
 arch/arm/configs/multi_v7_defconfig | 1 +
 1 file changed, 1 insertion(+)

-- 
2.7.4

Comments

Geert Uytterhoeven June 15, 2018, 6:09 a.m. | #1
Hi Daniel,

Thanks for your patch!

On Fri, Jun 15, 2018 at 12:52 AM Daniel Díaz <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@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

Patch

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