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

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Message-ID: <alpine.DEB.2.21.1806151026330.2079@nanos.tec.linutronix.de>
Date:   Fri, 15 Jun 2018 10:27:21 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Daniel Díaz <daniel.diaz@...aro.org>
cc:     x86@...nel.org, anders.roxell@...aro.org,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] x86: x86_64_defconfig: Enable KSM.

On Thu, 14 Jun 2018, Daniel Díaz 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

We all know that, but the above does not make an argument WHY this needs to
be enabled in defconfig.

Thanks,

	tglx