From: Robin Murphy <robin.murphy@arm.com>
To: Christoph Hellwig <hch@lst.de>
Cc: iommu@lists.linux-foundation.org, linux-mips@linux-mips.org,
linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
sparclinux@vger.kernel.org, Guan Xuetao <gxt@mprc.pku.edu.cn>,
linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
linux-c6x-dev@linux-c6x.org, linux-hexagon@vger.kernel.org,
x86@kernel.org, Konrad Rzeszutek Wilk <konrad@darnok.org>,
linux-snps-arc@lists.infradead.org,
linux-m68k@lists.linux-m68k.org, patches@groups.riscv.org,
linux-metag@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Michal Simek <monstr@monstr.eu>,
linux-parisc@vger.kernel.org, linux-cris-kernel@axis.com,
linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH 27/33] dma-direct: use node local allocations for coherent memory
Date: Wed, 10 Jan 2018 16:49:58 +0000 [thread overview]
Message-ID: <3f37ba8d-66fa-80e2-bbe1-77c2a4323d6b@arm.com> (raw)
In-Reply-To: <20180110153017.GD17790@lst.de>
On 10/01/18 15:30, Christoph Hellwig wrote:
> On Wed, Jan 10, 2018 at 12:06:22PM +0000, Robin Murphy wrote:
>> On 10/01/18 08:00, Christoph Hellwig wrote:
>>> To preserve the x86 behavior.
>>
>> And combined with patch 10/22 of the SWIOTLB refactoring, this means
>> SWIOTLB allocations will also end up NUMA-aware, right? Great, that's what
>> we want on arm64 too :)
>
> Well, only for swiotlb allocations that can be satisfied by
> dma_direct_alloc. If we actually have to fall back to the swiotlb
> buffers there is not node affinity yet.
Yeah, when I looked into it I reached the conclusion that per-node
bounce buffers probably weren't worth it - if you have to bounce you've
already pretty much lost the performance game, and if the CPU doing the
bouncing happens to be on a different node from the device you've
certainly lost either way. Per-node CMA zones we definitely *would*
like, but that's a future problem (it looks technically feasible without
huge infrastructure changes, but fiddly).
Robin.
next prev parent reply other threads:[~2018-01-10 16:49 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180110075954.rNNS_akKtTT2Fymmqi57YtAPw3BFv8C0i1tLoStUYI0@z>
2018-01-10 7:59 ` consolidate direct dma mapping V3 Christoph Hellwig
[not found] ` <20180110075955.xyaqoPymRtW9wiPlNH79ciXXguYefS0SpDREHSzJJNI@z>
2018-01-10 7:59 ` [PATCH 01/33] alpha: mark jensen as broken Christoph Hellwig
[not found] ` <20180110075956.LpErkmnAuMrrkVJ1lJle-w8MeBWCs-j_MomRB9wlTUc@z>
2018-01-10 7:59 ` [PATCH 02/33] hexagon: remove unused flush_write_buffers definition Christoph Hellwig
[not found] ` <20180110075957.ZqzRe0YJoOX3-r_M1InpJF-fkUFqxM4XPxeIu4hv5V4@z>
2018-01-10 7:59 ` [PATCH 03/33] m32r: " Christoph Hellwig
[not found] ` <20180110075958.uuXcHI2qTnVew_U5EBCilZhfXepqQkdI7iIBCe6ZvhM@z>
2018-01-10 7:59 ` [PATCH 04/33] powerpc: " Christoph Hellwig
[not found] ` <20180110075959.6sEG2e0ysgrqrNgdXrZMZab8v4MeXogEiS35AWEA-Uo@z>
2018-01-10 7:59 ` [PATCH 05/33] arc: remove CONFIG_ARC_PLAT_NEEDS_PHYS_TO_DMA Christoph Hellwig
[not found] ` <20180110080000.kdub66o4ERXhkTs6iAgJTzptFPxgCNnobxK6BW5s2CY@z>
2018-01-10 8:00 ` [PATCH 06/33] m32r: remove the unused dma_capable helper Christoph Hellwig
[not found] ` <20180110080001.i0or7pFxqgscebJEezkpOFwBLaBX6WLM4BzpgMoSGZM@z>
2018-01-10 8:00 ` [PATCH 07/33] riscv: " Christoph Hellwig
[not found] ` <20180110080002.oJYlzkQZIl7chb9aZwzCP2l9mMUApBoXI5UiKJWy8v0@z>
2018-01-10 8:00 ` [PATCH 08/33] s390: " Christoph Hellwig
[not found] ` <20180110080003.kMHgc5OKQEdiGhTxL5ZAljnaQhIam1Yrlg2lV6uyXws@z>
2018-01-10 8:00 ` [PATCH 09/33] dma-mapping: take dma_pfn_offset into account in dma_max_pfn Christoph Hellwig
[not found] ` <20180110110755.ICMKgRQ-16iXlF5WyYQzYejYJ2HFnVYObMoyY7JdRRI@z>
2018-01-10 11:07 ` Robin Murphy
[not found] ` <20180110080004.OO8fmV19swMCRTH7Y9C4mJujh9hyLsyd5kkyz8W-hV0@z>
2018-01-10 8:00 ` [PATCH 10/33] arm64: don't override dma_max_pfn Christoph Hellwig
2018-01-10 11:08 ` Robin Murphy
[not found] ` <20180110080005.8xTp_tym5XoVLXy8A9NiaRfmI60iGHS0QaGMnvFiJ-Q@z>
2018-01-10 8:00 ` [PATCH 11/33] dma-mapping: move swiotlb arch helpers to a new header Christoph Hellwig
[not found] ` <20180110093145.kN7Q9sGLmW8qc9mlArDSUhgUrkgHaApCbGPkgMoBVf0@z>
2018-01-10 9:31 ` Vladimir Murzin
2018-01-10 15:22 ` Christoph Hellwig
[not found] ` <20180110145601.vM-zTBFRXJVeTsaMeEyr-jLgpB8zSncSpXT7XDge8Ik@z>
2018-01-10 14:56 ` Robin Murphy
2018-01-10 15:26 ` Christoph Hellwig
2018-01-10 15:31 ` Robin Murphy
2018-01-10 15:40 ` Christoph Hellwig
[not found] ` <20180110080006.MTsxI1aDMh9vBcilC2izpKByUL8RuY-zdCQ8TluBJw0@z>
2018-01-10 8:00 ` [PATCH 12/33] dma-mapping: move dma_mark_clean to dma-direct.h Christoph Hellwig
[not found] ` <20180110080007.rEJcGJnsUw0fD2K2ZfrNx9FlGbs4BGtJY9hROtwlnNY@z>
2018-01-10 8:00 ` [PATCH 13/33] hexagon: use the generic dma_capable helper Christoph Hellwig
[not found] ` <20180110080008.5g7TIFeXsNqmhfWd0bQI2aceFjAfL-Y4p0eJIPFAlpE@z>
2018-01-10 8:00 ` [PATCH 14/33] powerpc: rename dma_direct_ to dma_nommu_ Christoph Hellwig
[not found] ` <20180110080009.T6CSjomQhYjv6gcZIqnCFjTmFQ3yYZ8QX3iH9PbAU-I@z>
2018-01-10 8:00 ` [PATCH 15/33] microblaze: rename dma_direct to dma_nommu Christoph Hellwig
[not found] ` <20180110080010.GfSrvRB24PCfgkXIsri-KMzKowkuVbx57jsSbzr8CW8@z>
2018-01-10 8:00 ` [PATCH 16/33] microblaze: remove dma_nommu_dma_supported Christoph Hellwig
[not found] ` <20180110080011.OWmV710qZMREMCTLtMVbTNs8-CidojamtFV-NcZBsWU@z>
2018-01-10 8:00 ` [PATCH 17/33] microblaze: remove the dead !NOT_COHERENT_CACHE dma code Christoph Hellwig
[not found] ` <20180110080012.Jq8cyYAvWgjddf02kjDqiR23gjqlQUBne5dc2UH0pC4@z>
2018-01-10 8:00 ` [PATCH 18/33] s390: move s390_pci_dma_ops to asm/pci_dma.h Christoph Hellwig
[not found] ` <20180110080013.nj6_TAebQSWJSMMULMebTA9UAq8d-FigGYZzFTW0wzk@z>
2018-01-10 8:00 ` [PATCH 19/33] dma-mapping: warn when there is no coherent_dma_mask Christoph Hellwig
[not found] ` <20180110080014.lrA3Q12dVsDyKgptQXpxwIjwUVBVkHzOu8wDGXBW32g@z>
2018-01-10 8:00 ` [PATCH 20/33] dma-mapping: clear harmful GFP_* flags in common code Christoph Hellwig
[not found] ` <20180110115930.4WRO-OJiZ64fysr0n95q9RjVUAASZoTMeKtyIFGqOB0@z>
2018-01-10 11:59 ` Robin Murphy
2018-01-10 15:29 ` Christoph Hellwig
[not found] ` <20180110080015.iHTUn6yY5OkxN02q4UW8n0QrztbJ2kMwHvEbqloRHf8@z>
2018-01-10 8:00 ` [PATCH 21/33] dma-mapping: add an arch_dma_supported hook Christoph Hellwig
2018-01-12 13:17 ` Konrad Rzeszutek Wilk
[not found] ` <20180110080016.SbWZT892U0kagNge1bzkmXW0yOiNoK1K1Ln4xWZ3Qeg@z>
2018-01-10 8:00 ` [PATCH 22/33] dma-mapping: provide a generic asm/dma-mapping.h Christoph Hellwig
[not found] ` <20180110080017.ZsOyqiv2tlYuZ5o5Nk-sbd9cMz0GiRewWqqz2aymyVU@z>
2018-01-10 8:00 ` [PATCH 23/33] dma-direct: rename dma_noop to dma_direct Christoph Hellwig
[not found] ` <20180110080018.PuGVDS31BAewexTaLEfuREO6T64Rh81lwDu0NCPlY_o@z>
2018-01-10 8:00 ` [PATCH 24/33] dma-direct: use phys_to_dma Christoph Hellwig
2018-01-10 8:00 ` [PATCH 25/33] dma-direct: add dma address sanity checks Christoph Hellwig
[not found] ` <20180110080020.Iffmmjvf0MhCnxygiRRqncZll9O2qBKoLwydEQ4kcCs@z>
2018-01-10 8:00 ` [PATCH 26/33] dma-direct: add support for CMA allocation Christoph Hellwig
[not found] ` <20180110080021.XQySUg6vme-ZQOWCm3yjL2bAqslrQdRUlvYZwuC_t9w@z>
2018-01-10 8:00 ` [PATCH 27/33] dma-direct: use node local allocations for coherent memory Christoph Hellwig
2018-01-10 12:06 ` Robin Murphy
[not found] ` <20180110153017.FhjqEuKJd0frJtensuwzJhsnykXenurWQYJNgCQJjek@z>
2018-01-10 15:30 ` Christoph Hellwig
2018-01-10 16:49 ` Robin Murphy [this message]
[not found] ` <20180110080022.yRB7XMPyK5RV7ifPl_aC6KOUaxpRqE6MAlxFudqXv5U@z>
2018-01-10 8:00 ` [PATCH 28/33] dma-direct: add support for allocation from ZONE_DMA and ZONE_DMA32 Christoph Hellwig
[not found] ` <20180110080023.8Ogv4XgcKU3y5k-gvAr-eKUbFSVUWBZvEZD4fcacPtU@z>
2018-01-10 8:00 ` [PATCH 29/33] dma-direct: retry allocations using GFP_DMA for small masks Christoph Hellwig
[not found] ` <20180110093216.xAs3a-taANKhWXrMnfOqu1pyo8vpvUVecrDjO2EQMkU@z>
2018-01-10 9:32 ` Vladimir Murzin
[not found] ` <20180110080024.t6f8YONl22yDJu4otaUR-5LN-z4QWViVlawJYX7WKaM@z>
2018-01-10 8:00 ` [PATCH 30/33] dma-direct: make dma_direct_{alloc,free} available to other implementations Christoph Hellwig
[not found] ` <20180110080025.Rh60dqJ28iUl0dOzWQH1dsJNoHxb2fngQaFFE8fiH_4@z>
2018-01-10 8:00 ` [PATCH 31/33] dma-direct: reject too small dma masks Christoph Hellwig
2018-01-10 11:49 ` Robin Murphy
2018-01-10 15:32 ` Christoph Hellwig
2018-01-10 17:00 ` Robin Murphy
[not found] ` <20180110080026.nnf7hVVuEQ54XZuvNF6SkkldLNFlIu2iusWIRtlXJBg@z>
2018-01-10 8:00 ` [PATCH 32/33] cris: use dma-direct Christoph Hellwig
[not found] ` <20180110080027.HjVrEUjHRrZtzbRLugYctMZd6X4DEYYly0-JqvO79vM@z>
2018-01-10 8:00 ` [PATCH 33/33] h8300: " Christoph Hellwig
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