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    SubjectRe: [PATCH v7 0/7] Introduce ZONE_CMA
    Hi,
    I didn't get to read though patches yet but the cover letter didn't
    really help me to understand the basic concepts to have a good starting
    point before diving into implementation details. It contains a lot of
    history remarks which is not bad but IMHO too excessive here. I would
    appreciate the following information (some of that is already provided
    in the cover but could benefit from some rewording/text reorganization).

    - what is ZONE_CMA and how it is configured (from admin POV)
    - how does ZONE_CMA compare to other zones
    - who is allowed to allocate from this zone and what are the
    guarantees/requirements for successful allocation
    - how does the zone compare to a preallocate allocation pool
    - how is ZONE_CMA balanced/reclaimed due to internal memory pressure
    (from CMA users)
    - is this zone reclaimable for the global memory reclaim
    - why this was/is controversial
    --
    Michal Hocko
    SUSE Labs

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