From: "Michal Nazarewicz" <mina86@mina86.com>
To: Marek Szyprowski <m.szyprowski@samsung.com>,
Mel Gorman <mel@csn.ul.ie>, Michal Nazarewicz <mina86@mina86.com>
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>,
Ankita Garg <ankita@in.ibm.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>
Subject: Re: [PATCH 4/9] mm: MIGRATE_CMA migration type added
Date: Thu, 27 Oct 2011 11:10:42 +0200 [thread overview]
Message-ID: <op.v3z6f4173l0zgt@mpn-glaptop> (raw)
In-Reply-To: <op.v3ve8vbl3l0zgt@mpn-glaptop>
> On Tue, 18 Oct 2011 06:08:26 -0700, Mel Gorman <mel@csn.ul.ie> wrote:
>> This does mean that MIGRATE_CMA also does not have a per-cpu list.
>> I don't know if that matters to you but all allocations using
>> MIGRATE_CMA will take the zone lock.
On Mon, 24 Oct 2011 21:32:45 +0200, Michal Nazarewicz <mina86@mina86.com> wrote:
> This is sort of an artefact of my misunderstanding of pcp lists in the
> past. I'll have to re-evaluate the decision not to include CMA on pcp
> list.
Actually sorry. My comment above is somehow invalid.
The CMA does not need to be on pcp list because CMA pages are never allocated
via standard kmalloc() and friends. Because of the fallbacks in rmqueue_bulk()
the CMA pages end up being added to a pcp list of the MOVABLE type and so when
kmallec() allocates an MOVABLE page it can end up grabbing a CMA page.
So it's quite OK that CMA does not have its own pcp list as the list would
not be used anyway.
--
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--
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next prev parent reply other threads:[~2011-10-27 9:10 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-06 13:54 [PATCHv16 0/9] Contiguous Memory Allocator Marek Szyprowski
2011-10-06 13:54 ` [PATCH 1/9] mm: move some functions from memory_hotplug.c to page_isolation.c Marek Szyprowski
2011-10-14 23:23 ` Andrew Morton
2011-10-18 12:05 ` Mel Gorman
2011-10-06 13:54 ` [PATCH 2/9] mm: alloc_contig_freed_pages() added Marek Szyprowski
2011-10-14 23:29 ` Andrew Morton
2011-10-16 8:01 ` Michal Nazarewicz
2011-10-16 8:31 ` Andrew Morton
2011-10-16 9:39 ` Michal Nazarewicz
2011-10-17 12:21 ` Marek Szyprowski
2011-10-17 18:39 ` Andrew Morton
2011-10-18 12:21 ` Mel Gorman
2011-10-18 17:26 ` Michal Nazarewicz
2011-10-18 17:48 ` Dave Hansen
2011-10-18 18:00 ` Michal Nazarewicz
2011-10-21 10:06 ` Mel Gorman
2011-10-24 1:00 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-11-01 15:04 ` Mel Gorman
2011-11-01 18:06 ` Michal Nazarewicz
2011-11-01 18:47 ` Mel Gorman
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-24 4:05 ` Michal Nazarewicz
2011-10-06 13:54 ` [PATCH 3/9] mm: alloc_contig_range() added Marek Szyprowski
2011-10-14 23:35 ` Andrew Morton
2011-10-18 12:38 ` Mel Gorman
2011-10-06 13:54 ` [PATCH 4/9] mm: MIGRATE_CMA migration type added Marek Szyprowski
2011-10-14 23:38 ` Andrew Morton
2011-10-18 13:08 ` Mel Gorman
2011-10-24 19:32 ` Michal Nazarewicz
2011-10-27 9:10 ` Michal Nazarewicz [this message]
2011-10-06 13:54 ` [PATCH 5/9] mm: MIGRATE_CMA isolation functions added Marek Szyprowski
2011-10-06 13:54 ` [PATCH 6/9] drivers: add Contiguous Memory Allocator Marek Szyprowski
2011-10-14 23:57 ` Andrew Morton
2011-10-16 10:08 ` Russell King - ARM Linux
2011-10-18 13:43 ` Mel Gorman
2011-10-24 19:39 ` Michal Nazarewicz
2011-11-04 10:41 ` Marek Szyprowski
2011-10-06 13:54 ` [PATCH 7/7] ARM: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2011-10-06 14:18 ` Marek Szyprowski
2011-10-15 0:03 ` Andrew Morton
2011-10-06 13:54 ` [PATCH 7/9] X86: " Marek Szyprowski
2011-10-06 13:54 ` [PATCH 8/9] ARM: " Marek Szyprowski
2011-10-14 4:33 ` [Linaro-mm-sig] " Subash Patel
2011-10-14 9:14 ` Marek Szyprowski
2011-10-06 13:54 ` [PATCH 9/9] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2011-10-07 16:27 ` [PATCHv16 0/9] Contiguous Memory Allocator Arnd Bergmann
2011-10-10 6:58 ` [Linaro-mm-sig] " Ohad Ben-Cohen
2011-10-10 12:02 ` Clark, Rob
2011-10-10 22:56 ` Andrew Morton
2011-10-11 6:57 ` Marek Szyprowski
2011-10-11 13:52 ` Arnd Bergmann
2011-10-14 23:19 ` Andrew Morton
2011-10-15 14:24 ` Arnd Bergmann
2011-10-10 12:07 ` [Linaro-mm-sig] " Maxime Coquelin
2011-10-11 7:17 ` Marek Szyprowski
2011-10-11 7:30 ` Maxime Coquelin
2011-10-11 10:50 ` Marek Szyprowski
2011-10-11 11:25 ` Maxime Coquelin
2011-10-11 13:05 ` Marek Szyprowski
2011-10-12 11:08 ` [PATCH] fixup: mm: alloc_contig_range: increase min_free_kbytes during allocation Marek Szyprowski
2011-10-12 13:01 ` Maxime Coquelin
-- strict thread matches above, loose matches on Subject: below --
2011-08-12 10:58 [PATCHv14 0/9] Contiguous Memory Allocator Marek Szyprowski
2011-08-12 10:58 ` [PATCH 4/9] mm: MIGRATE_CMA migration type added Marek Szyprowski
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