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From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Chen Feng <puck.chen@hisilicon.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Rik van Riel <riel@redhat.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	mgorman@techsingularity.net, Laura Abbott <lauraa@codeaurora.org>,
	Minchan Kim <minchan@kernel.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Michal Nazarewicz <mina86@mina86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 2/6] mm/cma: introduce new zone, ZONE_CMA
Date: Mon, 7 Nov 2016 16:27:02 +0900	[thread overview]
Message-ID: <20161107072702.GC21159@js1304-P5Q-DELUXE> (raw)
In-Reply-To: <58202881.5030004@hisilicon.com>

On Mon, Nov 07, 2016 at 03:08:49PM +0800, Chen Feng wrote:
> 
> 
> 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

ZONE_CMA approach will act like as your solution. Could you elaborate
more on the problem of zone approach?

Thanks.

WARNING: multiple messages have this Message-ID (diff)
From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Chen Feng <puck.chen@hisilicon.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Rik van Riel <riel@redhat.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	mgorman@techsingularity.net, Laura Abbott <lauraa@codeaurora.org>,
	Minchan Kim <minchan@kernel.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Michal Nazarewicz <mina86@mina86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 2/6] mm/cma: introduce new zone, ZONE_CMA
Date: Mon, 7 Nov 2016 16:27:02 +0900	[thread overview]
Message-ID: <20161107072702.GC21159@js1304-P5Q-DELUXE> (raw)
In-Reply-To: <58202881.5030004@hisilicon.com>

On Mon, Nov 07, 2016 at 03:08:49PM +0800, Chen Feng wrote:
> 
> 
> 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

ZONE_CMA approach will act like as your solution. Could you elaborate
more on the problem of zone approach?

Thanks.

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  reply	other threads:[~2016-11-07  7:25 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-14  3:03 [PATCH v6 0/6] Introduce ZONE_CMA js1304
2016-10-14  3:03 ` js1304
2016-10-14  3:03 ` [PATCH v6 1/6] mm/page_alloc: don't reserve ZONE_HIGHMEM for ZONE_MOVABLE request js1304
2016-10-14  3:03   ` js1304
2016-10-14  3:03 ` [PATCH v6 2/6] mm/cma: introduce new zone, ZONE_CMA js1304
2016-10-14  3:03   ` js1304
2016-11-01  7:58   ` Chen Feng
2016-11-01  7:58     ` Chen Feng
2016-11-07  6:15     ` Joonsoo Kim
2016-11-07  6:15       ` Joonsoo Kim
2016-11-07  7:08       ` Chen Feng
2016-11-07  7:08         ` Chen Feng
2016-11-07  7:27         ` Joonsoo Kim [this message]
2016-11-07  7:27           ` Joonsoo Kim
2016-11-07  7:44           ` Chen Feng
2016-11-07  7:44             ` Chen Feng
2016-11-07  7:46             ` Chen Feng
2016-11-07  7:46               ` Chen Feng
2016-11-08  3:59               ` Joonsoo Kim
2016-11-08  3:59                 ` Joonsoo Kim
2016-11-08  6:59                 ` Chen Feng
2016-11-08  6:59                   ` Chen Feng
2016-11-11  6:38                   ` Joonsoo Kim
2016-11-11  6:38                     ` Joonsoo Kim
2016-10-14  3:03 ` [PATCH v6 3/6] mm/cma: populate ZONE_CMA js1304
2016-10-14  3:03   ` js1304
2016-10-18  7:42   ` Vlastimil Babka
2016-10-18  7:42     ` Vlastimil Babka
2016-10-18  8:27     ` Joonsoo Kim
2016-10-18  8:27       ` Joonsoo Kim
2016-10-26  4:31       ` Joonsoo Kim
2016-10-26  4:31         ` Joonsoo Kim
2016-10-26  7:27         ` Vlastimil Babka
2016-10-26  7:27           ` Vlastimil Babka
2016-10-14  3:03 ` [PATCH v6 4/6] mm/cma: remove ALLOC_CMA js1304
2016-10-14  3:03   ` js1304
2016-10-14  3:03 ` [PATCH v6 5/6] mm/cma: remove MIGRATE_CMA js1304
2016-10-14  3:03   ` js1304
2016-10-14  3:03 ` [PATCH v6 6/6] mm/cma: remove per zone CMA stat js1304
2016-10-14  3:03   ` js1304
2016-11-07  6:25 ` [PATCH v6 0/6] Introduce ZONE_CMA Joonsoo Kim
2016-11-07  6:25   ` Joonsoo Kim
2016-11-28  7:41   ` Joonsoo Kim
2016-11-28  7:41     ` Joonsoo Kim

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