From: Marek Szyprowski <m.szyprowski@samsung.com>
To: 'sandeep patil' <psandeep.s@gmail.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>,
'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>,
'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@jp.fujitsu.com>
Subject: RE: [Linaro-mm-sig] [PATCH 04/11] mm: page_alloc: introduce alloc_contig_range()
Date: Thu, 19 Jan 2012 08:36:38 +0100 [thread overview]
Message-ID: <002901ccd67d$1465e560$3d31b020$%szyprowski@samsung.com> (raw)
In-Reply-To: <CA+K6fF6A1kPUW-2Mw5+W_QaTuLfU0_m0aMYRLOg98mFKwZOhtQ@mail.gmail.com>
Hello,
On Tuesday, January 17, 2012 10:54 PM sandeep patil wrote:
> I am running a CMA test where I keep allocating from a CMA region as long
> as the allocation fails due to lack of space.
>
> However, I am seeing failures much before I expect them to happen.
> When the allocation fails, I see a warning coming from __alloc_contig_range(),
> because test_pages_isolated() returned "true".
>
> The new retry code does try a new range and eventually succeeds.
(snipped)
> From the log it looks like the warning showed up because page->private
> is set to MIGRATE_CMA instead of MIGRATE_ISOLATED.
> I've also had a test case where it failed because (page_count() != 0)
This means that the page is temporarily used by someone else (like for example
io subsystem or a driver).
> Have you or anyone else seen this during the CMA testing?
Yes, we observed such issues and we are also working on fixing them. However
we gave higher priority to get the basic CMA patches merged to mainline. Once
this happen the above issues can be fixed incrementally.
> Also, could this be because we are finding a page within (start, end)
> that actually belongs
> to a higher order Buddy block ?
No, such pages should be correctly handled.
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:[~2012-01-19 7:36 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-29 12:39 [PATCHv18 0/11] Contiguous Memory Allocator Marek Szyprowski
2011-12-29 12:39 ` [PATCH 01/11] mm: page_alloc: set_migratetype_isolate: drain PCP prior to isolating Marek Szyprowski
2012-01-01 7:49 ` Gilad Ben-Yossef
2012-01-01 15:54 ` Michal Nazarewicz
2012-01-01 16:06 ` Gilad Ben-Yossef
2012-01-01 18:52 ` Michal Nazarewicz
2012-01-05 15:39 ` Michal Nazarewicz
2012-01-05 19:20 ` Marek Szyprowski
2011-12-29 12:39 ` [PATCH 02/11] mm: compaction: introduce isolate_{free,migrate}pages_range() Marek Szyprowski
2012-01-10 13:43 ` Mel Gorman
2012-01-10 15:04 ` Michal Nazarewicz
2011-12-29 12:39 ` [PATCH 03/11] mm: compaction: export some of the functions Marek Szyprowski
2011-12-29 12:39 ` [PATCH 04/11] mm: page_alloc: introduce alloc_contig_range() Marek Szyprowski
2012-01-10 14:16 ` Mel Gorman
2012-01-13 20:04 ` Michal Nazarewicz
2012-01-16 9:01 ` Mel Gorman
2012-01-16 12:48 ` Michal Nazarewicz
2012-01-17 21:54 ` [Linaro-mm-sig] " sandeep patil
2012-01-17 22:19 ` Michal Nazarewicz
2012-01-18 0:46 ` sandeep patil
2012-01-18 1:44 ` Michal Nazarewicz
2012-01-19 7:36 ` Marek Szyprowski [this message]
2011-12-29 12:39 ` [PATCH 05/11] mm: mmzone: MIGRATE_CMA migration type added Marek Szyprowski
2012-01-10 14:38 ` Mel Gorman
2012-01-10 15:04 ` Michal Nazarewicz
2011-12-29 12:39 ` [PATCH 06/11] mm: page_isolation: MIGRATE_CMA isolation functions added Marek Szyprowski
2011-12-29 12:39 ` [PATCH 07/11] mm: add optional memory reclaim in split_free_page() Marek Szyprowski
2012-01-10 14:45 ` Mel Gorman
2011-12-29 12:39 ` [PATCH 08/11] drivers: add Contiguous Memory Allocator Marek Szyprowski
2011-12-29 12:39 ` [PATCH 09/11] X86: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2011-12-29 12:39 ` [PATCH 10/11] ARM: " Marek Szyprowski
2011-12-29 12:39 ` [PATCH 11/11] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2012-01-10 8:42 ` [PATCHv18 0/11] Contiguous Memory Allocator Marek Szyprowski
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='002901ccd67d$1465e560$3d31b020$%szyprowski@samsung.com' \
--to=m.szyprowski@samsung.com \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--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=mel@csn.ul.ie \
--cc=mina86@mina86.com \
--cc=psandeep.s@gmail.com \
/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