From: "Michal Nazarewicz" <mina86@mina86.com>
To: "Marek Szyprowski" <m.szyprowski@samsung.com>,
"Mel Gorman" <mel@csn.ul.ie>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org, linux-mm@kvack.org,
linaro-mm-sig@lists.linaro.org,
"Kyungmin Park" <kyungmin.park@samsung.com>,
"Russell King" <linux@arm.linux.org.uk>,
"Andrew Morton" <akpm@linux-foundation.org>,
"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>,
"Daniel Walker" <dwalker@codeaurora.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Jesse Barker" <jesse.barker@linaro.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shariq Hasnain" <shariq.hasnain@linaro.org>,
"Chunsang Jeong" <chunsang.jeong@linaro.org>,
"Dave Hansen" <dave@linux.vnet.ibm.com>,
"Benjamin Gaignard" <benjamin.gaignard@linaro.org>
Subject: Re: [PATCH 08/15] mm: mmzone: MIGRATE_CMA migration type added
Date: Mon, 30 Jan 2012 14:06:50 +0100 [thread overview]
Message-ID: <op.v8wepotk3l0zgt@mpn-glaptop> (raw)
In-Reply-To: <20120130123542.GL25268@csn.ul.ie>
> On Thu, Jan 26, 2012 at 10:00:50AM +0100, Marek Szyprowski wrote:
>> From: Michal Nazarewicz <mina86@mina86.com>
>> @@ -875,10 +895,15 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
>> * This array describes the order lists are fallen back to when
>> * the free lists for the desirable migrate type are depleted
>> */
>> -static int fallbacks[MIGRATE_TYPES][3] = {
>> +static int fallbacks[MIGRATE_TYPES][4] = {
>> [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE },
>> [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_RESERVE },
>> +#ifdef CONFIG_CMA
>> + [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_CMA , MIGRATE_RESERVE },
On Mon, 30 Jan 2012 13:35:42 +0100, Mel Gorman <mel@csn.ul.ie> wrote:
> This is a curious choice. MIGRATE_CMA is allowed to contain movable
> pages. By using MIGRATE_RECLAIMABLE and MIGRATE_UNMOVABLE for movable
> pages instead of MIGRATE_CMA, you increase the changes that unmovable
> pages will need to use MIGRATE_MOVABLE in the future which impacts
> fragmentation avoidance. I would recommend that you change this to
>
> { MIGRATE_CMA, MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE }
At the beginning the idea was to try hard not to get pages from MIGRATE_CMA
allocated at all, thus it was put at the end of the fallbacks list, but on
a busy system this probably won't help anyway, so I'll change it per your
suggestion.
>> @@ -1017,11 +1049,14 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
>> rmv_page_order(page);
>>
>> /* Take ownership for orders >= pageblock_order */
>> - if (current_order >= pageblock_order)
>> + if (current_order >= pageblock_order &&
>> + !is_pageblock_cma(page))
>> change_pageblock_range(page, current_order,
>> start_migratetype);
>>
>> - expand(zone, page, order, current_order, area, migratetype);
>> + expand(zone, page, order, current_order, area,
>> + is_migrate_cma(start_migratetype)
>> + ? start_migratetype : migratetype);
>>
>
> What is this check meant to be doing?
>
> start_migratetype is determined by allocflags_to_migratetype() and
> that never will be MIGRATE_CMA so is_migrate_cma(start_migratetype)
> should always be false.
Right, thanks! This should be the other way around, ie.:
+ expand(zone, page, order, current_order, area,
+ is_migrate_cma(migratetype)
+ ? migratetype : start_migratetype);
I'll fix this and the calls to is_pageblock_cma().
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
next prev parent reply other threads:[~2012-01-30 13:06 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-26 9:00 [PATCHv19 00/15] Contiguous Memory Allocator Marek Szyprowski
2012-01-26 9:00 ` [PATCH 01/15] mm: page_alloc: remove trailing whitespace Marek Szyprowski
2012-01-30 10:59 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 02/15] mm: page_alloc: update migrate type of pages on pcp when isolating Marek Szyprowski
2012-01-30 11:15 ` Mel Gorman
2012-01-30 15:41 ` Michal Nazarewicz
2012-01-30 16:14 ` Mel Gorman
2012-01-31 16:23 ` Marek Szyprowski
2012-02-02 12:47 ` Mel Gorman
2012-02-02 19:53 ` Michal Nazarewicz
2012-02-03 9:31 ` Marek Szyprowski
2012-02-03 11:27 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 03/15] mm: compaction: introduce isolate_migratepages_range() Marek Szyprowski
2012-01-30 11:24 ` Mel Gorman
2012-01-30 12:42 ` Michal Nazarewicz
2012-01-30 13:25 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 04/15] mm: compaction: introduce isolate_freepages_range() Marek Szyprowski
2012-01-30 11:48 ` Mel Gorman
2012-01-30 11:55 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 05/15] mm: compaction: export some of the functions Marek Szyprowski
2012-01-30 11:57 ` Mel Gorman
2012-01-30 12:33 ` Michal Nazarewicz
2012-01-26 9:00 ` [PATCH 06/15] mm: page_alloc: introduce alloc_contig_range() Marek Szyprowski
2012-01-30 12:11 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 07/15] mm: page_alloc: change fallbacks array handling Marek Szyprowski
2012-01-30 12:12 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 08/15] mm: mmzone: MIGRATE_CMA migration type added Marek Szyprowski
2012-01-30 12:35 ` Mel Gorman
2012-01-30 13:06 ` Michal Nazarewicz [this message]
2012-01-30 14:52 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 09/15] mm: page_isolation: MIGRATE_CMA isolation functions added Marek Szyprowski
2012-01-26 9:00 ` [PATCH 10/15] mm: extract reclaim code from __alloc_pages_direct_reclaim() Marek Szyprowski
2012-01-30 12:42 ` Mel Gorman
2012-01-26 9:00 ` [PATCH 11/15] mm: trigger page reclaim in alloc_contig_range() to stabilize watermarks Marek Szyprowski
2012-01-30 13:05 ` Mel Gorman
2012-01-31 17:15 ` Marek Szyprowski
2012-01-26 9:00 ` [PATCH 12/15] drivers: add Contiguous Memory Allocator Marek Szyprowski
2012-01-27 9:44 ` [Linaro-mm-sig] " Ohad Ben-Cohen
2012-01-27 10:53 ` Marek Szyprowski
2012-01-27 14:27 ` Clark, Rob
2012-01-27 14:51 ` Marek Szyprowski
2012-01-27 14:59 ` Ohad Ben-Cohen
2012-01-27 15:17 ` Marek Szyprowski
2012-01-28 18:57 ` Ohad Ben-Cohen
2012-01-30 7:43 ` Marek Szyprowski
2012-01-30 9:16 ` Ohad Ben-Cohen
2012-01-27 14:56 ` Ohad Ben-Cohen
2012-01-26 9:00 ` [PATCH 13/15] X86: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2012-01-26 9:00 ` [PATCH 14/15] ARM: " Marek Szyprowski
2012-01-26 9:00 ` [PATCH 15/15] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2012-01-26 15:31 ` [PATCHv19 00/15] Contiguous Memory Allocator Arnd Bergmann
2012-01-26 15:38 ` Michal Nazarewicz
2012-01-26 15:48 ` Marek Szyprowski
2012-01-28 0:26 ` Andrew Morton
2012-01-29 18:09 ` Rob Clark
2012-01-29 20:32 ` Anca Emanuel
2012-01-29 20:51 ` Arnd Bergmann
2012-01-30 13:25 ` Mel Gorman
2012-01-30 15:43 ` Michal Nazarewicz
[not found] ` <CA+M3ks7h1t6DbPSAhPN6LJ5Dw84hSukfWG16avh2eZL+o4caJg@mail.gmail.com>
2012-02-01 8:47 ` Marek Szyprowski
2012-02-10 18:10 ` Marek Szyprowski
2012-02-03 12:18 [PATCHv20 " Marek Szyprowski
2012-02-03 12:18 ` [PATCH 08/15] mm: mmzone: MIGRATE_CMA migration type added Marek Szyprowski
2012-02-03 13:53 ` Mel Gorman
2012-02-03 14:19 ` Hillf Danton
2012-02-03 15:50 ` Michal Nazarewicz
2012-02-04 9:09 ` Hillf Danton
2012-02-05 14:37 ` Michal Nazarewicz
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