linux-kernel - Re: [PATCH 2/2] arm: multi_v7

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Message-ID: <CAMuHMdXp-Sh6pUNsWHk9UaYLbb4uLoeFoSPrBXm-sYDS-ptHiQ@mail.gmail.com>
Date:   Fri, 15 Jun 2018 08:09:14 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     daniel.diaz@...aro.org
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        anders.roxell@...aro.org, Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Stefan Agner <stefan@...er.ch>,
        ext Tony Lindgren <tony@...mide.com>,
        Eric Anholt <eric@...olt.net>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        martin.blumenstingl@...glemail.com,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm: multi_v7_defconfig: Enable KSM.

Hi Daniel,

Thanks for your patch!

On Fri, Jun 15, 2018 at 12:52 AM Daniel Díaz <daniel.diaz@...aro.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@...ux-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