linux-kernel - Re: [PATCH v2 2/2] [PATCH 2/2] mm: add merging after mremap resize

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Date:   Mon, 30 May 2022 13:15:03 +0200
From:   Jakub Matěna <matenajakub@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, patches@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>,
        mhocko@...nel.org, mgorman@...hsingularity.net,
        willy@...radead.org, Liam Howlett <liam.howlett@...cle.com>,
        Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>, riel@...riel.com,
        rostedt@...dmis.org, peterz@...radead.org
Subject: Re: [PATCH v2 2/2] [PATCH 2/2] mm: add merging after mremap resize

On Mon, May 30, 2022 at 1:47 AM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Fri, 27 May 2022 23:17:08 +0200 Jakub Matěna <matenajakub@...il.com> wrote:
>
> > When mremap call results in expansion, it might be possible to merge the
> > VMA with the next VMA which might become adjacent. This patch adds
> > vma_merge call after the expansion is done to try and merge.
>
> Thanks.
>
> Would it make sense to add a test case for this in (I assume)
> tools/testing/selftests/vm/mremap_test.c?  Maybe parse /proc/self/maps
> and check that the merging occurred as expected?
>

It shouldn't be a problem and it makes sense. I will do it.

Jakub Matěna