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Re: [PATCH v7 0/7] Introduce ZONE_CMA

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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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[PATCH v7 0/7] Introduce ZONE_CMA js1304@gmail.com - 2017-04-11 05:20 +0200
  [PATCH v7 7/7] ARM: CMA: avoid re-mapping CMA region if CONFIG_HIGHMEM js1304@gmail.com - 2017-04-11 05:20 +0200
  [PATCH v7 5/7] mm/cma: remove MIGRATE_CMA js1304@gmail.com - 2017-04-11 05:20 +0200
  Re: [PATCH v7 0/7] Introduce ZONE_CMA Michal Hocko <mhocko@kernel.org> - 2017-04-11 20:20 +0200
    Re: [PATCH v7 0/7] Introduce ZONE_CMA Joonsoo Kim <js1304@gmail.com> - 2017-04-12 03:40 +0200
      Re: [PATCH v7 0/7] Introduce ZONE_CMA Michal Hocko <mhocko@kernel.org> - 2017-04-13 14:00 +0200
        Re: [PATCH v7 0/7] Introduce ZONE_CMA Joonsoo Kim <js1304@gmail.com> - 2017-04-17 04:10 +0200
          Re: [PATCH v7 0/7] Introduce ZONE_CMA Joonsoo Kim <js1304@gmail.com> - 2017-04-21 03:40 +0200
            Re: [PATCH v7 0/7] Introduce ZONE_CMA Michal Hocko <mhocko@kernel.org> - 2017-04-21 09:00 +0200
          Re: [PATCH v7 0/7] Introduce ZONE_CMA Michal Hocko <mhocko@kernel.org> - 2017-04-24 15:20 +0200
  Re: [PATCH v7 0/7] Introduce ZONE_CMA Joonsoo Kim <js1304@gmail.com> - 2017-04-12 03:40 +0200
  Re: [PATCH v7 0/7] Introduce ZONE_CMA Bob Liu <liubo95@huawei.com> - 2017-04-24 06:10 +0200

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