> -----Original Message-----
> From: Randy Dunlap [mailto:rdun...@infradead.org]
> Sent: Saturday, August 22, 2020 4:08 AM
> To: Song Bao Hua (Barry Song) <song.bao....@hisilicon.com>; h...@lst.de;
> m.szyprow...@samsung.com; robin.mur...@arm.com; w...@kernel.org;
> ganapatrao.kulka...@cavium.com; catalin.mari...@arm.com;
> a...@linux-foundation.org
> Cc: iommu@lists.linux-foundation.org; linux-arm-ker...@lists.infradead.org;
> linux-ker...@vger.kernel.org; Zengtao (B) <prime.z...@hisilicon.com>;
> huangdaode <huangda...@huawei.com>; Linuxarm <linux...@huawei.com>;
> Jonathan Cameron <jonathan.came...@huawei.com>; Nicolas Saenz Julienne
> <nsaenzjulie...@suse.de>; Steve Capper <steve.cap...@arm.com>; Mike
> Rapoport <r...@linux.ibm.com>
> 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 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.
As I've replied in Mike's comment, I'd like to rename it to cma_per...
>
>
> > 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
Thanks
Barry
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