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

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Message-Id: <20211115211905.faef6f9db3ce4a6fb9ed66a2@linux-foundation.org>
Date:   Mon, 15 Nov 2021 21:19:05 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Suren Baghdasaryan <surenb@...gle.com>
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 (張錦文) 
        <chinwen.chang@...iatek.com>,
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        Muchun Song <songmuchun@...edance.com>,
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        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 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?

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