linux-kernel - Re: [PATCH] CMA: treat free cma pages as non-free if not ALLOC

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Message-ID: <20150123012334.GA32632@js1304-P5Q-DELUXE>
Date:	Fri, 23 Jan 2015 10:23:34 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Zhang Yanfei <zhangyanfei.yes@...il.com>,
	Minchan Kim <minchan@...nel.org>, Hui Zhu <teawater@...il.com>,
	akpm@...ux-foundation.org, mgorman@...e.de, hannes@...xchg.org,
	riel@...hat.com, vbabka@...e.cz, isimatu.yasuaki@...fujitsu.com,
	wangnan0@...wei.com, davidlohr@...com, rientjes@...gle.com,
	sasha.levin@...cle.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Hui Zhu <zhuhui@...omi.com>,
	Weixing Liu <liuweixing@...omi.com>
Subject: Re: [PATCH] CMA: treat free cma pages as non-free if not ALLOC_CMA
 on watermark checking

On Thu, Jan 22, 2015 at 10:12:43AM -0600, Christoph Lameter wrote:
> On Thu, 22 Jan 2015, Joonsoo Kim wrote:
> 
> > > Just out of curiosity, "new zone"? Something like movable zone?
> >
> > Yes, I named it as ZONE_CMA. Maybe I can send prototype of
> > implementation within 1 or 2 weeks.
> 
> Ugghh. I'd rather reduce the zone types. Do we need slab allocator etc
> allocations in that zone? This will multiply the management structures in
> various subsystems.

Hello,

Pages in CMA area should be movable so slab allocator which uses
unmovable/reclaimable allocation wouldn't need to consider that zone.

Thanks.
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