port
> Subject: Re: [PATCH v7 1/3] dma-contiguous: provide the ability to reserve
> per-numa CMA
>
> On 8/21/20 4:33 AM, Barry Song wrote:
> > ---
> > -v7: with respect to Will's comments
> > * move to use for_each_online_node
> > * add description if users d
om;
> catalin.mari...@arm.com; a...@linux-foundation.org;
> iommu@lists.linux-foundation.org; linux-arm-ker...@lists.infradead.org;
> linux-ker...@vger.kernel.org; Zengtao (B) ;
> huangdaode ; Linuxarm ;
> Jonathan Cameron ; Nicolas Saenz Julienne
> ; Steve Capper
> Subject: Re: [PA
On 8/21/20 4:33 AM, Barry Song wrote:
> ---
> -v7: with respect to Will's comments
> * move to use for_each_online_node
> * add description if users don't specify pernuma_cma
> * provide default value for CONFIG_DMA_PERNUMA_CMA
>
> .../admin-guide/kernel-parameters.txt | 11 ++
> inc
On Fri, Aug 21, 2020 at 11:33:53PM +1200, Barry Song wrote:
> Right now, drivers like ARM SMMU are using dma_alloc_coherent() to get
> coherent DMA buffers to save their command queues and page tables. As
> there is only one default CMA in the whole system, SMMUs on nodes other
> than node0 will ge
Right now, drivers like ARM SMMU are using dma_alloc_coherent() to get
coherent DMA buffers to save their command queues and page tables. As
there is only one default CMA in the whole system, SMMUs on nodes other
than node0 will get remote memory. This leads to significant latency.
This patch prov
