linux-kernel - Re: [PATCH v6 2/6] mm/cma: introduce new zone, ZONE

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Date:   Mon, 7 Nov 2016 15:08:49 +0800
From:   Chen Feng <puck.chen@...ilicon.com>
To:     Joonsoo Kim <iamjoonsoo.kim@....com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        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>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 2/6] mm/cma: introduce new zone, ZONE_CMA



On 2016/11/7 14:15, Joonsoo Kim wrote:
> On Tue, Nov 01, 2016 at 03:58:32PM +0800, Chen Feng wrote:
>> Hello, I hava a question on cma zone.
>>
>> When we have cma zone, cma zone will be the highest zone of system.
>>
>> In android system, the most memory allocator is ION. Media system will
>> alloc unmovable memory from it.
>>
>> On low memory scene, will the CMA zone always do balance?
> 
> Allocation request for low zone (normal zone) would not cause CMA zone
> to be balanced since it isn't helpful.
> 
Yes. But the cma zone will run out soon. And it always need to do balance.

How about use migrate cma before movable and let cma type to fallback movable.

https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1263745.html

>> Should we transmit the highest available zone to kswapd？
> 
> It is already done when necessary.
> 
> Thanks.
> 
> 
> .
>