Re: [PATCH v7 1/3] dma-contiguous: provide the ability to reserve per-numa CMA
From: Randy Dunlap <hidden>
Date: 2020-08-21 16:09:00
Also in:
linux-iommu, lkml
On 8/21/20 4:33 AM, Barry Song wrote:
quoted hunk ↗ jump to hunk
--- -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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel