From: tixy@yxit.co.uk (Tixy)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 7/9] ARM: DMA: steal memory for DMA coherent mappings
Date: Thu, 18 Aug 2011 09:27:53 +0100 [thread overview]
Message-ID: <1313656073.2254.23.camel@computer2> (raw)
In-Reply-To: <009101cc5cde$6dfaa660$49eff320$%szyprowski@samsung.com>
On Wed, 2011-08-17 at 15:06 +0200, Marek Szyprowski wrote:
[...]
> > > Maybe for the first version a static pool with reasonably small size
> > > (like 128KiB) will be more than enough? This size can be even board
> > > depended or changed with kernel command line for systems that really
> > > needs more memory.
> >
> > For a first version that sounds good enough. Maybe we could use a fraction
> > of the CONSISTENT_DMA_SIZE as an estimate?
>
> Ok, good. For the initial values I will probably use 1/8 of
> CONSISTENT_DMA_SIZE for coherent allocations. Writecombine atomic allocations
> are extremely rare and rather ARM specific. 1/32 of CONSISTENT_DMA_SIZE should
> be more than enough for them.
For people who aren't aware, we have a patch to remove the define
CONSISTENT_DMA_SIZE and replace it with a runtime call to an
initialisation function [1]. I don't believe this fundamentally changes
anything being discussed though.
--
Tixy
[1] http://www.spinics.net/lists/arm-kernel/msg135589.html
WARNING: multiple messages have this Message-ID (diff)
From: Tixy <tixy@yxit.co.uk>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: "'Arnd Bergmann'" <arnd@arndb.de>,
"'Ankita Garg'" <ankita@in.ibm.com>,
"'Daniel Walker'" <dwalker@codeaurora.org>,
"'Russell King - ARM Linux'" <linux@arm.linux.org.uk>,
"'Jesse Barker'" <jesse.barker@linaro.org>,
"'Mel Gorman'" <mel@csn.ul.ie>,
"'Chunsang Jeong'" <chunsang.jeong@linaro.org>,
"'Jonathan Corbet'" <corbet@lwn.net>,
linux-kernel@vger.kernel.org,
"'Michal Nazarewicz'" <mina86@mina86.com>,
linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org,
"'Kyungmin Park'" <kyungmin.park@samsung.com>,
"'KAMEZAWA Hiroyuki'" <kamezawa.hiroyu@jp.fujitsu.com>,
"'Shariq Hasnain'" <shariq.hasnain@linaro.org>,
"'Andrew Morton'" <akpm@linux-foundation.org>,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org
Subject: RE: [PATCH 7/9] ARM: DMA: steal memory for DMA coherent mappings
Date: Thu, 18 Aug 2011 09:27:53 +0100 [thread overview]
Message-ID: <1313656073.2254.23.camel@computer2> (raw)
In-Reply-To: <009101cc5cde$6dfaa660$49eff320$%szyprowski@samsung.com>
On Wed, 2011-08-17 at 15:06 +0200, Marek Szyprowski wrote:
[...]
> > > Maybe for the first version a static pool with reasonably small size
> > > (like 128KiB) will be more than enough? This size can be even board
> > > depended or changed with kernel command line for systems that really
> > > needs more memory.
> >
> > For a first version that sounds good enough. Maybe we could use a fraction
> > of the CONSISTENT_DMA_SIZE as an estimate?
>
> Ok, good. For the initial values I will probably use 1/8 of
> CONSISTENT_DMA_SIZE for coherent allocations. Writecombine atomic allocations
> are extremely rare and rather ARM specific. 1/32 of CONSISTENT_DMA_SIZE should
> be more than enough for them.
For people who aren't aware, we have a patch to remove the define
CONSISTENT_DMA_SIZE and replace it with a runtime call to an
initialisation function [1]. I don't believe this fundamentally changes
anything being discussed though.
--
Tixy
[1] http://www.spinics.net/lists/arm-kernel/msg135589.html
WARNING: multiple messages have this Message-ID (diff)
From: Tixy <tixy@yxit.co.uk>
To: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: 'Arnd Bergmann' <arnd@arndb.de>,
'Ankita Garg' <ankita@in.ibm.com>,
'Daniel Walker' <dwalker@codeaurora.org>,
'Russell King - ARM Linux' <linux@arm.linux.org.uk>,
'Jesse Barker' <jesse.barker@linaro.org>,
'Mel Gorman' <mel@csn.ul.ie>,
'Chunsang Jeong' <chunsang.jeong@linaro.org>,
'Jonathan Corbet' <corbet@lwn.net>,
linux-kernel@vger.kernel.org,
'Michal Nazarewicz' <mina86@mina86.com>,
linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org,
'Kyungmin Park' <kyungmin.park@samsung.com>,
'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@jp.fujitsu.com>,
'Shariq Hasnain' <shariq.hasnain@linaro.org>,
'Andrew Morton' <akpm@linux-foundation.org>,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org
Subject: RE: [PATCH 7/9] ARM: DMA: steal memory for DMA coherent mappings
Date: Thu, 18 Aug 2011 09:27:53 +0100 [thread overview]
Message-ID: <1313656073.2254.23.camel@computer2> (raw)
In-Reply-To: <009101cc5cde$6dfaa660$49eff320$%szyprowski@samsung.com>
On Wed, 2011-08-17 at 15:06 +0200, Marek Szyprowski wrote:
[...]
> > > Maybe for the first version a static pool with reasonably small size
> > > (like 128KiB) will be more than enough? This size can be even board
> > > depended or changed with kernel command line for systems that really
> > > needs more memory.
> >
> > For a first version that sounds good enough. Maybe we could use a fraction
> > of the CONSISTENT_DMA_SIZE as an estimate?
>
> Ok, good. For the initial values I will probably use 1/8 of
> CONSISTENT_DMA_SIZE for coherent allocations. Writecombine atomic allocations
> are extremely rare and rather ARM specific. 1/32 of CONSISTENT_DMA_SIZE should
> be more than enough for them.
For people who aren't aware, we have a patch to remove the define
CONSISTENT_DMA_SIZE and replace it with a runtime call to an
initialisation function [1]. I don't believe this fundamentally changes
anything being discussed though.
--
Tixy
[1] http://www.spinics.net/lists/arm-kernel/msg135589.html
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next prev parent reply other threads:[~2011-08-18 8:27 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-12 10:58 [PATCHv14 0/9] Contiguous Memory Allocator Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 1/9] mm: move some functions from memory_hotplug.c to page_isolation.c Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 2/9] mm: alloc_contig_freed_pages() added Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 3/9] mm: alloc_contig_range() added Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 4/9] mm: MIGRATE_CMA migration type added Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 5/9] mm: MIGRATE_CMA isolation functions added Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 6/9] drivers: add Contiguous Memory Allocator Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 7/9] ARM: DMA: steal memory for DMA coherent mappings Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 12:53 ` Arnd Bergmann
2011-08-12 12:53 ` Arnd Bergmann
2011-08-12 12:53 ` Arnd Bergmann
2011-08-14 7:52 ` Russell King - ARM Linux
2011-08-14 7:52 ` Russell King - ARM Linux
2011-08-14 7:52 ` Russell King - ARM Linux
2011-08-16 13:28 ` Arnd Bergmann
2011-08-16 13:28 ` Arnd Bergmann
2011-08-16 13:28 ` Arnd Bergmann
2011-08-16 13:55 ` Russell King - ARM Linux
2011-08-16 13:55 ` Russell King - ARM Linux
2011-08-16 13:55 ` Russell King - ARM Linux
2011-08-16 14:26 ` Arnd Bergmann
2011-08-16 14:26 ` Arnd Bergmann
2011-08-16 14:26 ` Arnd Bergmann
2011-08-17 8:01 ` Marek Szyprowski
2011-08-17 8:01 ` Marek Szyprowski
2011-08-17 8:01 ` Marek Szyprowski
2011-08-17 12:28 ` Arnd Bergmann
2011-08-17 12:28 ` Arnd Bergmann
2011-08-17 12:28 ` Arnd Bergmann
2011-08-17 13:06 ` Marek Szyprowski
2011-08-17 13:06 ` Marek Szyprowski
2011-08-17 13:06 ` Marek Szyprowski
2011-08-18 8:27 ` Tixy [this message]
2011-08-18 8:27 ` Tixy
2011-08-18 8:27 ` Tixy
2011-08-17 12:49 ` Marek Szyprowski
2011-08-17 12:49 ` Marek Szyprowski
2011-08-17 12:49 ` Marek Szyprowski
2011-08-16 10:17 ` Marek Szyprowski
2011-08-16 10:17 ` Marek Szyprowski
2011-08-16 10:17 ` Marek Szyprowski
2011-08-12 10:58 ` [PATCH 8/9] ARM: integrate CMA with DMA-mapping subsystem Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 15:00 ` Arnd Bergmann
2011-08-12 15:00 ` Arnd Bergmann
2011-08-12 15:00 ` Arnd Bergmann
2011-08-16 9:29 ` Marek Szyprowski
2011-08-16 9:29 ` Marek Szyprowski
2011-08-16 9:29 ` Marek Szyprowski
2011-08-16 13:14 ` Arnd Bergmann
2011-08-16 13:14 ` Arnd Bergmann
2011-08-16 13:14 ` Arnd Bergmann
2011-08-12 10:58 ` [PATCH 9/9] ARM: S5PV210: example of CMA private area for FIMC device on Goni board Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
2011-08-12 10:58 ` Marek Szyprowski
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