Messages in this thread | | | Date | Tue, 20 Nov 2012 11:33:25 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH v2] mm: dmapool: use provided gfp flags for all dma_alloc_coherent() calls |
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On Tue, 20 Nov 2012 15:31:45 +0100 Marek Szyprowski <m.szyprowski@samsung.com> 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. Additionaly, > on ARM architecture any driver which is using dmapools will sooner or > later trigger the following error: > "ERROR: 256 KiB atomic DMA coherent pool is too small! > Please increase it with coherent_pool= kernel parameter!". > Increasing the coherent pool size usually doesn't help much and only > delays such error, because all GFP_ATOMIC DMA allocations are always > served from the special, very limited memory pool. >
Is this problem serious enough to justify merging the patch into 3.7? And into -stable kernels?
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