linux-kernel - Re: [PATCH 4/4] selftests/vm: add test for mlock() when areas are intersected.

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Date:   Wed, 31 Aug 2016 16:14:14 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     Simon Guo <wei.guo.simon@...il.com>
cc:     linux-mm@...ck.org, Alexey Klimov <klimov.linux@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Eric B Munson <emunson@...mai.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>, Shuah Khan <shuah@...nel.org>,
        Thierry Reding <treding@...dia.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 4/4] selftests/vm: add test for mlock() when areas are
 intersected.

On Tue, 30 Aug 2016, wei.guo.simon@...il.com wrote:

> From: Simon Guo <wei.guo.simon@...il.com>
> 
> This patch adds mlock() test for multiple invocation on
> the same address area, and verify it doesn't mess the
> rlimit mlock limitation.
> 

Thanks for expanding mlock testing.  I'm wondering if you are interested 
in more elaborate testing that doesn't only check what you are fixing, 
such as mlock(p + x, 40k) where x is < 20k?

Would you also be willing to make sure that the rlimit is actually 
enforced when it's expected to?