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SubjectRe: [PATCH v7 1/3] dma-contiguous: provide the ability to reserve per-numa CMA
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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 ++
> include/linux/dma-contiguous.h | 6 ++
> kernel/dma/Kconfig | 11 ++
> kernel/dma/contiguous.c | 100 ++++++++++++++++--
> 4 files changed, 118 insertions(+), 10 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index bdc1f33fd3d1..c609527fc35a 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -599,6 +599,17 @@
> altogether. For more information, see
> include/linux/dma-contiguous.h
>
> + pernuma_cma=nn[MG]
> + [ARM64,KNL]
> + Sets the size of kernel per-numa memory area for
> + contiguous memory allocations. A value of 0 disables
> + per-numa CMA altogether. And If this option is not
> + specificed, the default value is 0.
> + With per-numa CMA enabled, DMA users on node nid will
> + first try to allocate buffer from the pernuma area
> + which is located in node nid, if the allocation fails,
> + they will fallback to the global default memory area.
> +

Entries in kernel-parameters.txt are supposed to be in alphabetical order
but this one is not. If you want to keep it near the cma= entry, you can
rename it like Mike suggested. Otherwise it needs to be moved.


> cmo_free_hint= [PPC] Format: { yes | no }
> Specify whether pages are marked as being inactive
> when they are freed. This is used in CMO environments



--
~Randy

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