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

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Date:	Thu, 22 Jan 2015 10:12:43 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....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, 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.

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