linux-kernel - Re: [PATCH v5 2/6] mm/cma: introduce new zone, ZONE

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Message-Id: <87vayisfx3.fsf@linux.vnet.ibm.com>
Date:   Tue, 30 Aug 2016 16:05:20 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:     js1304@...il.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:     Rik van Riel <riel@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        mgorman@...hsingularity.net, Laura Abbott <lauraa@...eaurora.org>,
        Minchan Kim <minchan@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Michal Nazarewicz <mina86@...a86.com>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v5 2/6] mm/cma: introduce new zone, ZONE_CMA


....

>  static inline void check_highest_zone(enum zone_type k)
>  {
> -	if (k > policy_zone && k != ZONE_MOVABLE)
> +	if (k > policy_zone && k != ZONE_MOVABLE && !is_zone_cma_idx(k))
>  		policy_zone = k;
>  }
>


Should we apply policy to allocation from ZONE CMA ?. CMA reserve
happens early and may mostly come from one node. Do we want the
CMA allocation to fail if we use mbind(MPOL_BIND) with a node mask not
including that node on which CMA is reserved, considering CMA memory is
going to be used for special purpose.

-aneesh