linux-kernel - Re: [PATCH] selftests/mm: Confirm VA exhaustion without reliance on correctness of mmap()

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Date: Thu, 21 Mar 2024 14:51:46 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Dev Jain <dev.jain@....com>
Cc: shuah@...nel.org, linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, Anshuman.Khandual@....com
Subject: Re: [PATCH] selftests/mm: Confirm VA exhaustion without reliance on
 correctness of mmap()

On Thu, 21 Mar 2024 16:05:22 +0530 Dev Jain <dev.jain@....com> wrote:

> Currently, VA exhaustion is being checked by passing a hint to mmap() and
> expecting it to fail. This patch makes a stricter test by successful write()
> calls from /proc/self/maps to a dump file, confirming that a free chunk is
> indeed not available.

What's wrong with the current approach?