From: Barry Song <21cnbao@gmail.com>
To: Marek Szyprowski <m.szyprowski@samsung.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, Ohad Ben-Cohen <ohad@wizery.com>,
Daniel Walker <dwalker@codeaurora.org>,
Russell King <linux@arm.linux.org.uk>,
Arnd Bergmann <arnd@arndb.de>, Jonathan Corbet <corbet@lwn.net>,
Mel Gorman <mel@csn.ul.ie>, Michal Nazarewicz <mina86@mina86.com>,
Dave Hansen <dave@linux.vnet.ibm.com>,
Jesse Barker <jesse.barker@linaro.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Andrew Morton <akpm@linux-foundation.org>,
Rob Clark <rob.clark@linaro.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
DL-SHA-WorkGroupLinux <workgroup.linux@csr.com>
Subject: Re: [Linaro-mm-sig] [PATCHv23 13/16] drivers: add Contiguous Memory Allocator
Date: Wed, 29 Feb 2012 17:53:35 +0800 [thread overview]
Message-ID: <CAGsJ_4ygM6YAUj5mcskuEYcaJqYVHp_qzbUJvE9_huFhFcWtkg@mail.gmail.com> (raw)
In-Reply-To: <1329929337-16648-14-git-send-email-m.szyprowski@samsung.com>
2012/2/23 Marek Szyprowski <m.szyprowski@samsung.com>:
> The Contiguous Memory Allocator is a set of helper functions for DMA
> mapping framework that improves allocations of contiguous memory chunks.
>
> CMA grabs memory on system boot, marks it with MIGRATE_CMA migrate type
> and gives back to the system. Kernel is allowed to allocate only movable
> pages within CMA's managed memory so that it can be used for example for
> page cache when DMA mapping do not use it. On
> dma_alloc_from_contiguous() request such pages are migrated out of CMA
> area to free required contiguous block and fulfill the request. This
> allows to allocate large contiguous chunks of memory at any time
> assuming that there is enough free memory available in the system.
>
> This code is heavily based on earlier works by Michal Nazarewicz.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
> Acked-by: Arnd Bergmann <arnd@arndb.de>
> Tested-by: Rob Clark <rob.clark@linaro.org>
> Tested-by: Ohad Ben-Cohen <ohad@wizery.com>
> Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
> Tested-by: Robert Nelson <robertcnelson@gmail.com>
if there is a /proc/cmainfo like /proc/slabinfo, it might be helpful
to people as we can see the usage of CMA clearly.
Thanks
barry
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next prev parent reply other threads:[~2012-02-29 9:53 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-22 16:48 [PATCHv23 00/16] " Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 01/16] mm: page_alloc: remove trailing whitespace Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 02/16] mm: compaction: introduce isolate_migratepages_range() Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 03/16] mm: compaction: introduce map_pages() Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 04/16] mm: compaction: introduce isolate_freepages_range() Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 05/16] mm: compaction: export some of the functions Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 06/16] mm: page_alloc: introduce alloc_contig_range() Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 07/16] mm: page_alloc: change fallbacks array handling Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 08/16] mm: mmzone: MIGRATE_CMA migration type added Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 09/16] mm: page_isolation: MIGRATE_CMA isolation functions added Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 10/16] mm: Serialize access to min_free_kbytes Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 11/16] mm: extract reclaim code from __alloc_pages_direct_reclaim() Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 12/16] mm: trigger page reclaim in alloc_contig_range() to stabilise watermarks Marek Szyprowski
2012-02-29 9:48 ` [Linaro-mm-sig] " Barry Song
2012-03-08 21:25 ` Sandeep Patil
2012-02-22 16:48 ` [PATCHv23 13/16] drivers: add Contiguous Memory Allocator Marek Szyprowski
2012-02-29 9:53 ` Barry Song [this message]
2012-02-22 16:48 ` [PATCHv23 14/16] X86: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 15/16] ARM: " Marek Szyprowski
2012-02-22 16:48 ` [PATCHv23 16/16] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2012-02-29 9:35 ` [Linaro-mm-sig] [PATCHv23 00/16] Contiguous Memory Allocator Barry Song
2012-02-29 11:43 ` Michal Nazarewicz
2012-02-29 13:34 ` Barry Song
2012-02-29 13:36 ` Michal Nazarewicz
2012-02-29 13:43 ` Barry Song
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