From: sandeep patil <psandeep.s@gmail.com>
To: Michal Nazarewicz <mina86@mina86.com>
Cc: Mel Gorman <mel@csn.ul.ie>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Ohad Ben-Cohen <ohad@wizery.com>,
Daniel Walker <dwalker@codeaurora.org>,
Russell King <linux@arm.linux.org.uk>,
Arnd Bergmann <arnd@arndb.de>,
Jesse Barker <jesse.barker@linaro.org>,
Jonathan Corbet <corbet@lwn.net>,
linux-kernel@vger.kernel.org,
Dave Hansen <dave@linux.vnet.ibm.com>,
linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org,
Kyungmin Park <kyungmin.park@samsung.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
Rob Clark <rob.clark@linaro.org>,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org
Subject: Re: [Linaro-mm-sig] [PATCH 11/15] mm: trigger page reclaim in alloc_contig_range() to stabilize watermarks
Date: Wed, 8 Feb 2012 11:26:40 -0800 [thread overview]
Message-ID: <CA+K6fF7naDkPOK8Dv1gg-4RdrrCC5OTx498nFLxg==PPHz-q6g@mail.gmail.com> (raw)
In-Reply-To: <op.v9cr9sqm3l0zgt@mpn-glaptop>
2012/2/8 Michal Nazarewicz <mina86@mina86.com>:
> On Wed, 08 Feb 2012 03:04:18 +0100, sandeep patil <psandeep.s@gmail.com>
> wrote:
>>
>> There's another problem I am facing with zone watermarks and CMA.
>>
>> Test details:
>> Memory : 480 MB of total memory, 128 MB CMA region
>> Test case : around 600 MB of file transfer over USB RNDIS onto target
>> System Load : ftpd with console running on target.
>> No one is doing CMA allocations except for the DMA allocations done by the
>> drivers.
>>
>> Result : After about 300MB transfer, I start getting GFP_ATOMIC
>> allocation failures. This only happens if CMA region is reserved.
>> Total memory available is way above the zone watermarks. So, we ended
>> up starving
>> UNMOVABLE/RECLAIMABLE atomic allocations that cannot fallback on CMA
>> region.
>
>
> This looks like something Mel warned me about. I don't really have a good
> solution for that yet. ;/
What if we have NR_FREE_CMA_PAGES in vmstat and use them to calculate
__zone_watermark_ok()?
However, it still doesn't solve the problem when we DON'T want to use
NR_FREE_CMA_PAGES in case of MOVABLE allocations.
Sandeep
next prev parent reply other threads:[~2012-02-08 19:27 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-03 12:18 [PATCHv20 00/15] Contiguous Memory Allocator Marek Szyprowski
2012-02-03 12:18 ` [PATCH 01/15] mm: page_alloc: remove trailing whitespace Marek Szyprowski
2012-02-03 12:18 ` [PATCH 02/15] mm: compaction: introduce isolate_migratepages_range() Marek Szyprowski
2012-02-03 12:18 ` [PATCH 03/15] mm: compaction: introduce map_pages() Marek Szyprowski
2012-02-03 13:30 ` Mel Gorman
2012-02-03 12:18 ` [PATCH 04/15] mm: compaction: introduce isolate_freepages_range() Marek Szyprowski
2012-02-03 12:18 ` [PATCH 05/15] mm: compaction: export some of the functions Marek Szyprowski
2012-02-05 7:40 ` Hillf Danton
2012-02-05 14:34 ` Michal Nazarewicz
2012-02-06 12:46 ` Hillf Danton
2012-02-03 12:18 ` [PATCH 06/15] mm: page_alloc: introduce alloc_contig_range() Marek Szyprowski
2012-02-03 12:18 ` [PATCH 07/15] mm: page_alloc: change fallbacks array handling Marek Szyprowski
2012-02-03 12:18 ` [PATCH 08/15] mm: mmzone: MIGRATE_CMA migration type added Marek Szyprowski
2012-02-03 13:53 ` Mel Gorman
2012-02-03 14:19 ` Hillf Danton
2012-02-03 15:50 ` Michal Nazarewicz
2012-02-04 9:09 ` Hillf Danton
2012-02-05 14:37 ` Michal Nazarewicz
2012-02-03 12:18 ` [PATCH 09/15] mm: page_isolation: MIGRATE_CMA isolation functions added Marek Szyprowski
2012-02-03 12:18 ` [PATCH 10/15] mm: extract reclaim code from __alloc_pages_direct_reclaim() Marek Szyprowski
2012-02-03 12:18 ` [PATCH 11/15] mm: trigger page reclaim in alloc_contig_range() to stabilize watermarks Marek Szyprowski
2012-02-03 14:04 ` Mel Gorman
2012-02-08 2:04 ` [Linaro-mm-sig] " sandeep patil
2012-02-08 9:21 ` Michal Nazarewicz
2012-02-08 19:26 ` sandeep patil [this message]
2012-02-08 15:14 ` Marek Szyprowski
2012-02-10 11:19 ` Mel Gorman
2012-02-10 15:36 ` Marek Szyprowski
2012-02-03 12:18 ` [PATCH 12/15] drivers: add Contiguous Memory Allocator Marek Szyprowski
2012-02-05 4:25 ` Hillf Danton
2012-02-05 14:33 ` Michal Nazarewicz
2012-02-06 12:51 ` Hillf Danton
2012-02-03 12:18 ` [PATCH 13/15] X86: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2012-02-03 12:18 ` [PATCH 14/15] ARM: " Marek Szyprowski
2012-02-03 12:18 ` [PATCH 15/15] ARM: Samsung: use CMA for 2 memory banks for s5p-mfc device Marek Szyprowski
2012-02-03 14:09 ` [PATCHv20 00/15] Contiguous Memory Allocator Mel Gorman
2012-02-07 9:06 ` Contiguous Memory Allocator on HIGHMEM cp.zou
2012-02-07 9:48 ` Marek Szyprowski
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