From: Christoph Hellwig <hch@lst.de>
To: Jens Axboe <axboe@kernel.dk>
Cc: "Alex Williamson" <alex.williamson@redhat.com>,
linux-nvdimm@lists.01.org, linux-rdma@vger.kernel.org,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nvme@lists.infradead.org, linux-block@vger.kernel.org,
"Jérôme Glisse" <jglisse@redhat.com>,
"Jason Gunthorpe" <jgg@mellanox.com>,
"Christian König" <christian.koenig@amd.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Max Gurtovoy" <maxg@mellanox.com>,
"Christoph Hellwig" <hch@lst.de>
Subject: Re: [PATCH v5 07/13] block: Add PCI P2P flag for request queue and check support for requests
Date: Sat, 1 Sep 2018 10:28:12 +0200 [thread overview]
Message-ID: <20180901082812.GB670@lst.de> (raw)
In-Reply-To: <b5ab8fa3-34ac-3117-fa0d-5206c3939435@kernel.dk>
On Thu, Aug 30, 2018 at 01:11:18PM -0600, Jens Axboe wrote:
> I think this belongs in the caller - both the validity check, and
> passing in NOMERGE for this type of request. I don't want to impose
> this overhead on everything, for a pretty niche case.
It is just a single branch, which will be predicted as not taken
for non-P2P users. The benefit is that we get proper error checking
by doing it in the block code.
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next prev parent reply other threads:[~2018-09-01 8:25 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-30 18:53 [PATCH v5 00/13] Copy Offload in NVMe Fabrics with P2P PCI Memory Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 01/13] PCI/P2PDMA: Support peer-to-peer memory Logan Gunthorpe
2018-08-31 8:04 ` Christian König
2018-08-31 15:48 ` Logan Gunthorpe
2018-09-01 8:27 ` Christoph Hellwig
2018-08-31 16:19 ` Jonathan Cameron
2018-08-31 16:26 ` Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 02/13] PCI/P2PDMA: Add sysfs group to display p2pmem stats Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 03/13] PCI/P2PDMA: Add PCI p2pmem DMA mappings to adjust the bus offset Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 04/13] PCI/P2PDMA: Introduce configfs/sysfs enable attribute helpers Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 05/13] docs-rst: Add a new directory for PCI documentation Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 06/13] PCI/P2PDMA: Add P2P DMA driver writer's documentation Logan Gunthorpe
2018-08-31 0:34 ` Randy Dunlap
2018-08-31 15:44 ` Logan Gunthorpe
2018-08-31 8:08 ` Christian König
2018-08-31 15:51 ` Logan Gunthorpe
2018-08-31 17:38 ` Christian König
2018-08-31 19:11 ` Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 07/13] block: Add PCI P2P flag for request queue and check support for requests Logan Gunthorpe
2018-08-30 19:11 ` Jens Axboe
2018-08-30 19:17 ` Logan Gunthorpe
2018-08-30 19:19 ` Jens Axboe
2018-09-01 8:28 ` Christoph Hellwig [this message]
2018-09-03 22:26 ` Logan Gunthorpe
2018-09-05 19:26 ` Jens Axboe
2018-09-05 19:33 ` Logan Gunthorpe
2018-09-05 19:45 ` Jens Axboe
2018-09-05 19:53 ` Logan Gunthorpe
2018-09-05 19:56 ` Christoph Hellwig
2018-09-05 19:54 ` Jens Axboe
2018-09-05 20:11 ` Christoph Hellwig
2018-09-05 20:09 ` Logan Gunthorpe
2018-09-05 20:14 ` Jens Axboe
2018-09-05 20:18 ` Logan Gunthorpe
2018-09-05 20:19 ` Jens Axboe
2018-09-05 20:32 ` Logan Gunthorpe
2018-09-05 20:36 ` Jens Axboe
2018-09-05 21:03 ` Logan Gunthorpe
2018-09-05 21:13 ` Christoph Hellwig
2018-09-05 21:18 ` Jens Axboe
2018-09-10 16:41 ` Christoph Hellwig
2018-09-10 18:11 ` Logan Gunthorpe
2018-09-11 7:10 ` Christoph Hellwig
2018-08-30 18:53 ` [PATCH v5 08/13] IB/core: Ensure we map P2P memory correctly in rdma_rw_ctx_[init|destroy]() Logan Gunthorpe
2018-08-31 0:18 ` Sagi Grimberg
2018-08-30 18:53 ` [PATCH v5 09/13] nvme-pci: Use PCI p2pmem subsystem to manage the CMB Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 10/13] nvme-pci: Add support for P2P memory in requests Logan Gunthorpe
2018-09-04 15:16 ` Jason Gunthorpe
2018-09-04 15:47 ` Logan Gunthorpe
2018-09-05 19:22 ` Christoph Hellwig
2018-08-30 18:53 ` [PATCH v5 11/13] nvme-pci: Add a quirk for a pseudo CMB Logan Gunthorpe
2018-08-30 18:53 ` [PATCH v5 12/13] nvmet: Introduce helper functions to allocate and free request SGLs Logan Gunthorpe
2018-08-31 0:14 ` Sagi Grimberg
2018-08-30 18:53 ` [PATCH v5 13/13] nvmet: Optionally use PCI P2P memory Logan Gunthorpe
2018-08-31 0:25 ` Sagi Grimberg
2018-08-31 15:41 ` Logan Gunthorpe
2018-08-30 19:20 ` [PATCH v5 00/13] Copy Offload in NVMe Fabrics with P2P PCI Memory Jerome Glisse
2018-08-30 19:30 ` Logan Gunthorpe
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