From: sandeep patil <psandeep.s@gmail.com>
To: Michal Nazarewicz <mina86@mina86.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
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,
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>, Dave Hansen <dave@linux.vnet.ibm.com>,
Jesse Barker <jesse.barker@linaro.org>,
Kyungmin Park <kyungmin.park@samsung.com>,
Ankita Garg <ankita@in.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [Linaro-mm-sig] [PATCHv17 0/11] Contiguous Memory Allocator
Date: Fri, 18 Nov 2011 15:30:49 -0800 [thread overview]
Message-ID: <CA+K6fF6iDivqmN9kfY34tWNg+g_rYBBmyS_Mxb6gvLuSgA2JyQ@mail.gmail.com> (raw)
In-Reply-To: <op.v45u6zyy3l0zgt@mpn-glaptop>
2011/11/18 Michal Nazarewicz <mina86@mina86.com>:
> On Fri, 18 Nov 2011 22:20:48 +0100, sandeep patil <psandeep.s@gmail.com>
> wrote:
>>
>> I am running a simple test to allocate contiguous regions and write a log
>> on
>> in a file on sdcard simultaneously. I can reproduce this migration failure
>> 100%
>> times with it.
>> when I tracked the pages that failed to migrate, I found them on the
>> buffer head lru
>> list with a reference held on the buffer_head in the page, which
>> causes drop_buffers()
>> to fail.
>>
>> So, i guess my question is, until all the migration failures are
>> tracked down and fixed,
>> is there a plan to retry the contiguous allocation from a new range in
>> the CMA region?
>
> No. Current CMA implementation will stick to the same range of pages also
> on consequent allocations of the same size.
>
Doesn't that mean the drivers that fail to allocate from contiguous DMA region
will fail, if the migration fails?
~ sandeep
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next prev parent reply other threads:[~2011-11-18 23:31 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-18 16:43 Marek Szyprowski
2011-11-18 16:43 ` [PATCH 01/11] mm: page_alloc: handle MIGRATE_ISOLATE in free_pcppages_bulk() Marek Szyprowski
2011-12-12 13:42 ` Mel Gorman
2011-12-12 14:23 ` Michal Nazarewicz
2011-12-12 14:42 ` Mel Gorman
2011-11-18 16:43 ` [PATCH 02/11] mm: compaction: introduce isolate_{free,migrate}pages_range() Marek Szyprowski
2011-12-12 14:07 ` Mel Gorman
2011-12-12 15:22 ` Michal Nazarewicz
2011-12-12 16:30 ` Mel Gorman
2011-12-12 16:46 ` Michal Nazarewicz
2011-12-12 17:20 ` Mel Gorman
2011-11-18 16:43 ` [PATCH 03/11] mm: mmzone: introduce zone_pfn_same_memmap() Marek Szyprowski
2011-12-12 14:19 ` Mel Gorman
2011-12-12 14:35 ` Michal Nazarewicz
2011-12-12 14:40 ` Mel Gorman
2011-12-12 14:51 ` Michal Nazarewicz
2011-12-12 15:51 ` Mel Gorman
2011-11-18 16:43 ` [PATCH 04/11] mm: compaction: export some of the functions Marek Szyprowski
2011-12-12 14:29 ` Mel Gorman
2011-12-12 14:41 ` Michal Nazarewicz
2011-12-12 15:40 ` Mel Gorman
2011-12-12 15:46 ` Michal Nazarewicz
2011-12-12 16:22 ` Arnd Bergmann
2011-11-18 16:43 ` [PATCH 05/11] mm: page_alloc: introduce alloc_contig_range() Marek Szyprowski
2011-11-18 16:43 ` [PATCH 06/11] mm: mmzone: MIGRATE_CMA migration type added Marek Szyprowski
2011-11-18 16:43 ` [PATCH 07/11] mm: page_isolation: MIGRATE_CMA isolation functions added Marek Szyprowski
2011-11-18 16:43 ` [PATCH 08/11] drivers: add Contiguous Memory Allocator Marek Szyprowski
2011-11-18 16:43 ` [PATCH 09/11] X86: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2011-11-18 16:43 ` [PATCH 10/11] ARM: " Marek Szyprowski
2011-11-18 16:43 ` [PATCH 11/11] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2011-11-18 21:20 ` [Linaro-mm-sig] [PATCHv17 0/11] Contiguous Memory Allocator sandeep patil
2011-11-18 21:26 ` Michal Nazarewicz
2011-11-18 23:30 ` sandeep patil [this message]
2011-11-19 18:09 ` Michal Nazarewicz
2011-11-25 16:43 ` [PATCH] mm: cma: hack/workaround for some allocation issues Marek Szyprowski
2011-11-25 21:08 ` Michal Nazarewicz
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