linux-kernel - Correlation CMA size and FORCE_MAX

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Message-ID: <CAOf5uwk=Tx+W-JuJBXUYjt2BLmSvr9Q153D1RTyJG_cmeO4AUw@mail.gmail.com>
Date:   Thu, 15 Sep 2022 23:36:12 +0200
From:   Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
To:     Mike Rapoport <rppt@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Correlation CMA size and FORCE_MAX_ZONEORDER

Hi all

Working on a small device with 128MB of memory and using imx_v6_v7
defconfig I found that CMA_SIZE_MBYTES, CMA_SIZE_PERCENTAGE
are not respected. The calculation done does not allow the requested
size. I think that this should be somehow documented and described but
I did not
find the documentation. Does it work this way?

With CMA_SIZE of 8MB I need to have FORCE_MAX_ZONEORDER=12 if I have
the default FORCE_MAX_ZONEORDER=14 the min size is 32Mb

Michael