linux-kernel - Re: [mm] 6471384af2: phoronix-test-suite.darktable.Masskrug.CPU-only.seconds 10.2% regression

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Date:   Thu, 9 Apr 2020 16:03:31 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Christoph Lameter <cl@...ux.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Sandeep Patil <sspatil@...roid.com>,
        Laura Abbott <labbott@...hat.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Jann Horn <jannh@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        OTC LSE PnP <otc.lse.pnp@...el.com>
Subject: Re: [mm]  6471384af2:
 phoronix-test-suite.darktable.Masskrug.CPU-only.seconds 10.2% regression

On Thu 09-04-20 21:50:29, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed a 10.2% regression of phoronix-test-suite.darktable.Masskrug.CPU-only.seconds due to commit:
> 
> 
> commit: 6471384af2a6530696fc0203bafe4de41a23c9ef ("mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
[...]
> CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y
> CONFIG_INIT_ON_FREE_DEFAULT_ON=y

So the feature is enabled by default and therefore this is no
regression. The feature is expected to have an overhead. It is nice to
see that quantified. These numbers roughly match those presented when
the feature was enabled.
-- 
Michal Hocko
SUSE Labs