linux-kernel - Re: [PATCH] mm: dmapool: use provided gfp flags for all dma_alloc

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Date:	Mon, 12 Nov 2012 11:38:20 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Soeren Moch <smoch@....de>
Cc:	Andrew Lunn <andrew@...n.ch>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linaro-mm-sig@...ts.linaro.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH] mm: dmapool: use provided gfp flags for all
 dma_alloc_coherent() calls

On Mon, Nov 12, 2012 at 10:48:02AM +0100, Soeren Moch wrote:
> On 11.11.2012 18:22, Andrew Lunn wrote:
> > On Thu, Nov 08, 2012 at 07:38:57AM +0100, Marek Szyprowski wrote:
> >> dmapool always calls dma_alloc_coherent() with GFP_ATOMIC flag,
> regardless
> >> the flags provided by the caller. This causes excessive pruning of
> >> emergency memory pools without any good reason. This patch
> changes the code
> >> to correctly use gfp flags provided by the dmapool caller. This should
> >> solve the dmapool usage on ARM architecture, where GFP_ATOMIC DMA
> >> allocations can be served only from the special, very limited
> memory pool.
> >>
> >> Reported-by: Soren Moch <smoch@....de>
> Please use
> Reported-by: Soeren Moch <smoch@....de>
> 
> >> Reported-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
> >> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> >
> > Tested-by: Andrew Lunn <andrew@...n.ch>
> >
> > I tested this on a Kirkwood QNAP after removing the call to
> > init_dma_coherent_pool_size().
> >
> >     Andrew
> 
> Tested-by: Soeren Moch <smoch@....de>
> 
> Now I had a chance to test this patch on my Kirkwood guruplug
> system with linux-3.6.6 . It is running much better now, but with the
> original 256K coherent pool size I still see errors after several hours
> of runtime:
> 
> Nov 12 09:42:32 guru kernel: ERROR: 256 KiB atomic DMA coherent pool
> is too small!
> Nov 12 09:42:32 guru kernel: Please increase it with coherent_pool=
> kernel parameter!

Hi Soeren

Could you tell us what DVB devices you are using.

Thanks
	Andrew
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