linux-kernel - Re: [PATCH v2 0/3] mm/cma: manage the memory of the CMA area by using the ZONE

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Date:   Fri, 22 Dec 2017 09:11:14 +0900
From:   Joonsoo Kim <iamjoonsoo.kim@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Rik van Riel <riel@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        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>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        Tony Lindgren <tony@...mide.com>,
        Michal Hocko <mhocko@...nel.org>
Subject: Re: [PATCH v2 0/3] mm/cma: manage the memory of the CMA area by
 using the ZONE_MOVABLE

On Fri, Dec 08, 2017 at 02:37:19PM -0800, Andrew Morton wrote:
> On Fri,  1 Dec 2017 16:53:03 +0900 js1304@...il.com wrote:
> 
> > From: Joonsoo Kim <iamjoonsoo.kim@....com>
> > 
> > v2
> > o previous failure in linux-next turned out that it's not the problem of
> > this patchset. It was caused by the wrong assumption by specific
> > architecture.
> > 
> > lkml.kernel.org/r/20171114173719.GA28152@...mide.com
> > 
> > o add missing cache flush to the patch "ARM: CMA: avoid double mapping
> > to the CMA area if CONFIG_HIGHMEM = y"
> > 
> > 
> > This patchset is the follow-up of the discussion about the
> > "Introduce ZONE_CMA (v7)" [1]. Please reference it if more information
> > is needed.
> > 
> > In this patchset, the memory of the CMA area is managed by using
> > the ZONE_MOVABLE. Since there is another type of the memory in this zone,
> > we need to maintain a migratetype for the CMA memory to account
> > the number of the CMA memory. So, unlike previous patchset, there is
> > less deletion of the code.
> > 
> > Otherwise, there is no big change.
> > 
> > Motivation of this patchset is described in the commit description of
> > the patch "mm/cma: manage the memory of the CMA area by using
> > the ZONE_MOVABLE". Please refer it for more information.
> > 
> > This patchset is based on linux-next-20170822 plus
> > "mm/page_alloc: don't reserve ZONE_HIGHMEM for ZONE_MOVABLE".
> 
> mhocko had issues with that patch which weren't addressed?
> http://lkml.kernel.org/r/20170914132452.d5klyizce72rhjaa@dhcp22.suse.cz

Hello, Andrew.

Sorry for late response. I was on a long vacation.

I don't do anything on that patch yet. In fact, that patch isn't really
necessary to this patchset so I didn't include it into this patchset.

I will re-submit that patch after fixing the issue.

Thanks.