linux-kernel - Re: [PATCH v11 2/3] mm: add a field to store names for private anonymous memory

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Message-ID: <CAJuCfpEqO8C7eRO1Mr+MULnuKxjjh1zq2j1yoGZhocghpr7V9w@mail.gmail.com>
Date:   Mon, 15 Nov 2021 22:10:21 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Colin Cross <ccross@...gle.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Michal Hocko <mhocko@...e.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Al Viro <viro@...iv.linux.org.uk>,
        Randy Dunlap <rdunlap@...radead.org>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Peter Xu <peterx@...hat.com>, rppt@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        vincenzo.frascino@....com,
        Chinwen Chang <chinwen.chang@...iatek.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Jann Horn <jannh@...gle.com>, apopple@...dia.com,
        John Hubbard <jhubbard@...dia.com>,
        Yu Zhao <yuzhao@...gle.com>, Will Deacon <will@...nel.org>,
        fenghua.yu@...el.com, thunder.leizhen@...wei.com,
        Hugh Dickins <hughd@...gle.com>, feng.tang@...el.com,
        Jason Gunthorpe <jgg@...pe.ca>, Roman Gushchin <guro@...com>,
        Thomas Gleixner <tglx@...utronix.de>, krisman@...labora.com,
        Chris Hyser <chris.hyser@...cle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Jens Axboe <axboe@...nel.dk>, legion@...nel.org,
        Rolf Eike Beer <eb@...ix.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Pavel Machek <pavel@....cz>,
        Muchun Song <songmuchun@...edance.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Thomas Cedeno <thomascedeno@...gle.com>, sashal@...nel.org,
        cxfcosmos@...il.com, Rasmus Villemoes <linux@...musvillemoes.dk>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm <linux-mm@...ck.org>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH v11 2/3] mm: add a field to store names for private
 anonymous memory

On Mon, Nov 15, 2021 at 9:19 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Tue, 19 Oct 2021 14:58:36 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> > As Andrew suggested, I checked the image sizes with allnoconfig builds:
> >
> > unpatched Linus' ToT
> >    text    data     bss     dec     hex filename
> > 1324759      32   73928 1398719 1557bf vmlinux
> >
> > After the first patch is applied (madvise refactoring)
> >    text    data     bss     dec     hex filename
> > 1322346      32   73928 1396306 154e52 vmlinux
> > >>> 2413 bytes decrease vs ToT <<<
> >
> > After all patches applied with CONFIG_ANON_VMA_NAME=n
> >    text    data     bss     dec     hex filename
> > 1322337      32   73928 1396297 154e49 vmlinux
> > >>> 2422 bytes decrease vs ToT <<<
> >
> > After all patches applied with CONFIG_ANON_VMA_NAME=y
> >    text    data     bss     dec     hex filename
> > 1325228      32   73928 1399188 155994 vmlinux
> > >>> 469 bytes increase vs ToT <<<
>
> Nice.  Presumably there are memory savings from no longer duplicating
> the vma names?

The third patch does have this effect.

>
> I fudged up a [0/n] changelog (please don't forget this) and merged it
> all for testing.

Thanks!