From: Maxime Coquelin <maxime.coquelin-nonst@stericsson.com>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linaro-mm-sig@lists.linaro.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>,
'Chunsang Jeong' <chunsang.jeong@linaro.org>,
'Michal Nazarewicz' <mina86@mina86.com>,
'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>,
"benjamin.gaignard@linaro.org" <benjamin.gaignard@linaro.org>,
Ludovic BARRE <ludovic.barre@stericsson.com>,
"vincent.guittot@linaro.org" <vincent.guittot@linaro.org>
Subject: Re: [Linaro-mm-sig] [PATCHv16 0/9] Contiguous Memory Allocator
Date: Tue, 11 Oct 2011 13:25:42 +0200 [thread overview]
Message-ID: <4E9427B6.8050306@stericsson.com> (raw)
In-Reply-To: <00b301cc8803$93b5b3e0$bb211ba0$%szyprowski@samsung.com>
On 10/11/2011 12:50 PM, Marek Szyprowski wrote:
> Hello,
>
> On Tuesday, October 11, 2011 9:30 AM Maxime Coquelin wrote:
>
>> On 10/11/2011 09:17 AM, Marek Szyprowski wrote:
>>> On Monday, October 10, 2011 2:08 PM Maxime Coquelin wrote:
>>>
>>> During our stress tests, we encountered some problems :
>>>
>>> 1) Contiguous allocation lockup:
>>> When system RAM is full of Anon pages, if we try to allocate a
>>> contiguous buffer greater than the min_free value, we face a
>>> dma_alloc_from_contiguous lockup.
>>> The expected result would be dma_alloc_from_contiguous() to fail.
>>> The problem is reproduced systematically on our side.
>>> Thanks for the report. Do you use Android's lowmemorykiller? I haven't
>>> tested CMA on Android kernel yet. I have no idea how it will interfere
>>> with Android patches.
>>>
>> The software used for this test (v16) is a generic 3.0 Kernel and a
>> minimal filesystem using Busybox.
> I'm really surprised. Could you elaborate a bit how to trigger this issue?
At system startup, I drop caches (sync && echo 3 >
/proc/sys/vm/drop_caches) and check how much memory is free.
For example, in my case, only 15MB is used on the 270MB available on the
system, so I got 255MB of free memory. Note that the min_free is 4MB in
my case.
In userspace, I allocate 230MB using malloc(), the free memory is now 25MB.
Finaly, I ask for a contiguous allocation of 64MB using CMA, the result
is a lockup in dma_alloc_from_contiguous().
> I've did several tests and I never get a lockup. Allocation failed from time
> to time though.
When it succeed, what is the behaviour on your side? Is the OOM triggered?
Regards,
Maxime
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next prev parent reply other threads:[~2011-10-11 11:29 UTC|newest]
Thread overview: 63+ 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
2011-10-24 4:05 ` 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
2011-10-06 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
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 [this message]
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
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