From: Marek Szyprowski <m.szyprowski@samsung.com>
To: 'Michal Nazarewicz' <mina86@mina86.com>,
'Dave Hansen' <dave@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org,
linux-mm@kvack.org, 'Kyungmin Park' <kyungmin.park@samsung.com>,
'Andrew Morton' <akpm@linux-foundation.org>,
'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@jp.fujitsu.com>,
'Ankita Garg' <ankita@in.ibm.com>,
'Daniel Walker' <dwalker@codeaurora.org>,
'Johan MOSSBERG' <johan.xx.mossberg@stericsson.com>,
'Mel Gorman' <mel@csn.ul.ie>, 'Pawel Osciak' <pawel@osciak.com>,
'Marek Szyprowski' <m.szyprowski@samsung.com>
Subject: RE: [PATCH 04/12] mm: alloc_contig_freed_pages() added
Date: Tue, 05 Apr 2011 09:23:53 +0200 [thread overview]
Message-ID: <008b01cbf362$6fb52c40$4f1f84c0$%szyprowski@samsung.com> (raw)
In-Reply-To: <op.vte0fgez3l0zgt@mnazarewicz-glaptop>
Hello,
On Monday, April 04, 2011 3:15 PM Michał Nazarewicz wrote:
> > What kind of success have you had running this in practice? I'd be
> > worried that some silly task or a sticky dentry would end up in the
> > range that you want to allocate in.
>
> I'm not sure what you are asking.
>
> The function requires the range to be marked as MIGRATE_ISOLATE and all
> pages being free, so nothing can be allocated there while the function
> is running.
>
> If you are asking about CMA in general, the range that CMA uses is marked
> as MIGRATE_CMA (a new migrate type) which means that only MIGRATE_MOVABLE
> pages can be allocated there. This means, that in theory, if there is
> enough memory the pages can always be moved out of the region. At leasts
> that's my understanding of the type. If this is correct, the allocation
> should always succeed provided enough memory for the pages within the
> region to be moved to is available.
>
> As of practice, I have run some simple test to see if the code works and
> they succeeded. Also, Marek has run some test with actual hardware and
> those worked well as well (but I'll let Marek talk about any details).
We did the tests with real multimedia drivers - video codec and video
converter (s5p-mfc and s5p-fimc). These drivers allocate large contiguous
buffers for video data. The allocation is performed when driver is opened
by user space application.
First we consumed system memory by running a set of simple applications
that just did some malloc() and filled memory with random pattern to consume
free pages. Then some of that memory has been freed and we ran the video
decoding application. Multimedia drivers successfully managed to allocate
required contiguous buffers from MIGRATE_CMA ranges.
The tests have been performed with different system usage patterns (malloc(),
heavy filesystem load, anonymous memory mapping). In all these cases CMA
worked surprisingly good allowing the drivers to allocate the required
contiguous buffers.
Best regards
--
Marek Szyprowski
Samsung Poland R&D Center
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next prev parent reply other threads:[~2011-04-05 7:24 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-31 13:15 [PATCHv9 0/12] Contiguous Memory Allocator Marek Szyprowski
2011-03-31 13:15 ` [PATCH 01/12] lib: bitmap: Added alignment offset for bitmap_find_next_zero_area() Marek Szyprowski
2011-03-31 13:15 ` [PATCH 02/12] lib: genalloc: Generic allocator improvements Marek Szyprowski
2011-03-31 13:15 ` [PATCH 03/12] mm: move some functions from memory_hotplug.c to page_isolation.c Marek Szyprowski
2011-03-31 13:16 ` [PATCH 04/12] mm: alloc_contig_freed_pages() added Marek Szyprowski
2011-03-31 15:58 ` Dave Hansen
2011-03-31 19:24 ` Steven Rostedt
2011-03-31 20:33 ` Dave Hansen
2011-03-31 21:09 ` Michal Nazarewicz
2011-03-31 21:14 ` Dave Hansen
2011-03-31 22:18 ` Michal Nazarewicz
2011-03-31 22:26 ` Dave Hansen
2011-03-31 22:51 ` Michal Nazarewicz
2011-04-01 14:03 ` Dave Hansen
2011-04-04 13:15 ` Michal Nazarewicz
2011-04-05 7:23 ` Marek Szyprowski [this message]
2011-03-31 13:16 ` [PATCH 05/12] mm: alloc_contig_range() added Marek Szyprowski
2011-03-31 16:02 ` Dave Hansen
2011-03-31 16:26 ` Michal Nazarewicz
2011-03-31 19:28 ` Steven Rostedt
2011-03-31 19:52 ` Michal Nazarewicz
2011-03-31 20:28 ` Dave Hansen
2011-03-31 21:17 ` Michal Nazarewicz
2011-03-31 19:26 ` Steven Rostedt
2011-03-31 16:04 ` Dave Hansen
2011-03-31 13:16 ` [PATCH 06/12] mm: cma: Contiguous Memory Allocator added Marek Szyprowski
2011-03-31 13:16 ` [PATCH 07/12] mm: MIGRATE_CMA migration type added Marek Szyprowski
2011-03-31 13:16 ` [PATCH 08/12] mm: MIGRATE_CMA isolation functions added Marek Szyprowski
2011-03-31 13:16 ` [PATCH 09/12] mm: MIGRATE_CMA support added to CMA Marek Szyprowski
2011-03-31 13:16 ` [PATCH 10/12] mm: cma: add CMA 'regions style' API (for testing) Marek Szyprowski
2011-03-31 13:16 ` [PATCH 11/12] v4l: videobuf2: add CMA allocator " Marek Szyprowski
2011-03-31 13:16 ` [PATCH 12/12] ARM: S5PC110: Added CMA regions to Aquila and Goni boards Marek Szyprowski
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