From: Marek Szyprowski <m.szyprowski@samsung.com>
To: 'Maxime Coquelin' <maxime.coquelin-nonst@stericsson.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,
'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,
'Ludovic BARRE' <ludovic.barre@stericsson.com>,
vincent.guittot@linaro.org
Subject: RE: [Linaro-mm-sig] [PATCHv16 0/9] Contiguous Memory Allocator
Date: Tue, 11 Oct 2011 15:05:47 +0200 [thread overview]
Message-ID: <00cb01cc8816$7e474600$7ad5d200$%szyprowski@samsung.com> (raw)
In-Reply-To: <4E9427B6.8050306@stericsson.com>
Hello,
On Tuesday, October 11, 2011 1:26 PM Maxime Coquelin wrote:
> 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().
Thanks for hint. I've managed to reproduce this issue. I will post fix asap.
> > 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?
OOM was never triggered.
Best regards
--
Marek Szyprowski
Samsung Poland R&D Center
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-10-11 13:06 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-06 13:54 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
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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='00cb01cc8816$7e474600$7ad5d200$%szyprowski@samsung.com' \
--to=m.szyprowski@samsung.com \
--cc=akpm@linux-foundation.org \
--cc=ankita@in.ibm.com \
--cc=arnd@arndb.de \
--cc=benjamin.gaignard@linaro.org \
--cc=chunsang.jeong@linaro.org \
--cc=corbet@lwn.net \
--cc=dave@linux.vnet.ibm.com \
--cc=dwalker@codeaurora.org \
--cc=jesse.barker@linaro.org \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=kyungmin.park@samsung.com \
--cc=linaro-mm-sig@lists.linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux@arm.linux.org.uk \
--cc=ludovic.barre@stericsson.com \
--cc=maxime.coquelin-nonst@stericsson.com \
--cc=mel@csn.ul.ie \
--cc=mina86@mina86.com \
--cc=vincent.guittot@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox