linux-kernel - [PATCH 1/2] x86: x86_64

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Message-Id: <1529016629-2948-1-git-send-email-daniel.diaz@linaro.org>
Date:   Thu, 14 Jun 2018 17:50:26 -0500
From:   Daniel Díaz <daniel.diaz@...aro.org>
To:     x86@...nel.org
Cc:     anders.roxell@...aro.org,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND
        64-BIT))
Subject: [PATCH 1/2] x86: x86_64_defconfig: Enable KSM.

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@...aro.org>
---
 arch/x86/configs/x86_64_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
index e32fc1f..8fd7396 100644
--- a/arch/x86/configs/x86_64_defconfig
+++ b/arch/x86/configs/x86_64_defconfig
@@ -48,6 +48,7 @@ CONFIG_MICROCODE_AMD=y
 CONFIG_X86_MSR=y
 CONFIG_X86_CPUID=y
 CONFIG_NUMA=y
+CONFIG_KSM=y
 CONFIG_X86_CHECK_BIOS_CORRUPTION=y
 # CONFIG_MTRR_SANITIZER is not set
 CONFIG_EFI=y
-- 
2.7.4