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

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Date:   Sun, 29 May 2022 16:47:18 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Jakub Matěna <matenajakub@...il.com>
Cc:     linux-mm@...ck.org, patches@...ts.linux.dev,
        linux-kernel@...r.kernel.org, vbabka@...e.cz, mhocko@...nel.org,
        mgorman@...hsingularity.net, willy@...radead.org,
        liam.howlett@...cle.com, hughd@...gle.com, 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 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?