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

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Message-ID: <20150122015718.GE21444@js1304-P5Q-DELUXE>
Date:	Thu, 22 Jan 2015 10:57:18 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Zhang Yanfei <zhangyanfei.yes@...il.com>
Cc:	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, cl@...ux.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 Tue, Jan 20, 2015 at 11:33:27PM +0800, Zhang Yanfei wrote:
> Hello Minchan,
> 
> How are you?
> 
> 在 2015/1/19 14:55, Minchan Kim 写道:
> > Hello,
> > 
> > On Sun, Jan 18, 2015 at 04:32:59PM +0800, Hui Zhu wrote:
> >> From: Hui Zhu <zhuhui@...omi.com>
> >>
> >> The original of this patch [1] is part of Joonsoo's CMA patch series.
> >> I made a patch [2] to fix the issue of this patch.  Joonsoo reminded me
> >> that this issue affect current kernel too.  So made a new one for upstream.
> > 
> > Recently, we found many problems of CMA and Joonsoo tried to add more
> > hooks into MM like agressive allocation but I suggested adding new zone
> 
> 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.

Thanks.
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