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From: Logan Gunthorpe <logang@deltatee.com>
To: Stephen Bates <sbates@raithlin.com>, Keith Busch <keith.busch@intel.com>
Cc: "Jason Gunthorpe" <jgg@ziepe.ca>,
	"Sagi Grimberg" <sagi@grimberg.me>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"Christoph Hellwig" <hch@lst.de>, "Jens Axboe" <axboe@kernel.dk>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Max Gurtovoy" <maxg@mellanox.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	"Steve Wise" <swise@opengridcomputing.com>
Subject: Re: [PATCH v2 10/10] nvmet: Optionally use PCI P2P memory
Date: Thu, 1 Mar 2018 17:03:09 -0700	[thread overview]
Message-ID: <9de7d9d1-3469-c315-ce47-0faa67a4e4c4@deltatee.com> (raw)
In-Reply-To: <CE2A5D93-E735-4414-8DC1-B308B74A1C5B@raithlin.com>



On 01/03/18 04:57 PM, Stephen  Bates wrote:
>> We don't want to lump these all together without knowing which region you're allocating from, right?
> 
> In all seriousness I do agree with you on these Keith in the long term. We would consider adding property flags for the memory as it is added to the p2p core and then the allocator could evolve to intelligently dish it out. Attributes like endurance, latency and special write commit requirements could all become attributes in time. Perhaps one more reason for a central entity for p2p memory allocation so this code does not end up having to go into many different drivers?

Ugh, I don't know... An allocator for PMR is going to be quite a 
different animal. It would probably need to look more like a filesystem 
given you'd need to access the same regions across reboots. I don't 
think it fits the p2pmem paradigm at all. I think it's something 
entirely new all together and who knows exactly what it will look like.

Logan

  reply	other threads:[~2018-03-02  0:03 UTC|newest]

Thread overview: 124+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-28 23:39 [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory Logan Gunthorpe
2018-02-28 23:39 ` [PATCH v2 01/10] PCI/P2PDMA: Support peer to peer memory Logan Gunthorpe
2018-03-01 17:37   ` Bjorn Helgaas
2018-03-01 18:55     ` Logan Gunthorpe
2018-03-01 23:00       ` Bjorn Helgaas
2018-03-01 23:06         ` Logan Gunthorpe
2018-03-01 23:14           ` Stephen  Bates
2018-03-01 23:45             ` Bjorn Helgaas
2018-02-28 23:39 ` [PATCH v2 02/10] PCI/P2PDMA: Add sysfs group to display p2pmem stats Logan Gunthorpe
2018-03-01 17:44   ` Bjorn Helgaas
2018-03-02  0:15     ` Logan Gunthorpe
2018-03-02  0:36       ` Dan Williams
2018-03-02  0:37         ` Logan Gunthorpe
2018-02-28 23:39 ` [PATCH v2 03/10] PCI/P2PDMA: Add PCI p2pmem dma mappings to adjust the bus offset Logan Gunthorpe
2018-03-01 17:49   ` Bjorn Helgaas
2018-03-01 19:36     ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches Logan Gunthorpe
2018-03-01 18:02   ` Bjorn Helgaas
2018-03-01 18:54     ` Stephen  Bates
2018-03-01 21:21       ` Alex Williamson
2018-03-01 21:26         ` Logan Gunthorpe
2018-03-01 21:32         ` Stephen  Bates
2018-03-01 21:35           ` Jerome Glisse
2018-03-01 21:37             ` Logan Gunthorpe
2018-03-01 23:15       ` Bjorn Helgaas
2018-03-01 23:59         ` Logan Gunthorpe
2018-03-01 19:13     ` Logan Gunthorpe
2018-03-05 22:28       ` Bjorn Helgaas
2018-03-05 23:01         ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 05/10] block: Introduce PCI P2P flags for request and request queue Logan Gunthorpe
2018-03-01 11:08   ` Sagi Grimberg
2018-02-28 23:40 ` [PATCH v2 06/10] IB/core: Add optional PCI P2P flag to rdma_rw_ctx_[init|destroy]() Logan Gunthorpe
2018-03-01 10:32   ` Sagi Grimberg
2018-03-01 17:16     ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB Logan Gunthorpe
2018-03-05  1:33   ` Oliver
2018-03-05 16:00     ` Keith Busch
2018-03-05 17:10       ` Logan Gunthorpe
2018-03-05 18:02         ` Sinan Kaya
2018-03-05 18:09           ` Logan Gunthorpe
2018-03-06  0:49         ` Oliver
2018-03-06  1:14           ` Logan Gunthorpe
2018-03-06 10:40             ` Oliver
2018-03-05 19:57       ` Sagi Grimberg
2018-03-05 20:10         ` Jason Gunthorpe
2018-03-05 20:16           ` Logan Gunthorpe
2018-03-05 20:42           ` Keith Busch
2018-03-05 20:50             ` Jason Gunthorpe
2018-03-05 20:13         ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 08/10] nvme-pci: Add support for P2P memory in requests Logan Gunthorpe
2018-03-01 11:07   ` Sagi Grimberg
2018-03-01 15:58     ` Stephen  Bates
2018-03-09  5:08       ` Bart Van Assche
2018-02-28 23:40 ` [PATCH v2 09/10] nvme-pci: Add a quirk for a pseudo CMB Logan Gunthorpe
2018-03-01 11:03   ` Sagi Grimberg
2018-02-28 23:40 ` [PATCH v2 10/10] nvmet: Optionally use PCI P2P memory Logan Gunthorpe
2018-03-01 11:03   ` Sagi Grimberg
2018-03-01 16:15     ` Stephen  Bates
2018-03-01 17:40     ` Logan Gunthorpe
2018-03-01 18:35       ` Sagi Grimberg
2018-03-01 18:42         ` Jason Gunthorpe
2018-03-01 19:01           ` Stephen  Bates
2018-03-01 19:27           ` Logan Gunthorpe
2018-03-01 22:45             ` Jason Gunthorpe
2018-03-01 22:56               ` Logan Gunthorpe
2018-03-01 23:00               ` Stephen  Bates
2018-03-01 23:20                 ` Jason Gunthorpe
2018-03-01 23:29                   ` Logan Gunthorpe
2018-03-01 23:32                   ` Stephen  Bates
2018-03-01 23:49                 ` Keith Busch
2018-03-01 23:52                   ` Logan Gunthorpe
2018-03-01 23:53                   ` Stephen  Bates
2018-03-02 15:53                     ` Christoph Hellwig
2018-03-02 20:51                       ` Stephen  Bates
2018-03-01 23:57                   ` Stephen  Bates
2018-03-02  0:03                     ` Logan Gunthorpe [this message]
2018-03-02 16:18                     ` Jason Gunthorpe
2018-03-02 17:10                       ` Logan Gunthorpe
2018-03-01 19:10         ` Logan Gunthorpe
2018-03-01  3:54 ` [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory Benjamin Herrenschmidt
2018-03-01  3:56   ` Benjamin Herrenschmidt
2018-03-01 18:04     ` Logan Gunthorpe
2018-03-01 20:29       ` Benjamin Herrenschmidt
2018-03-01 20:55         ` Jerome Glisse
2018-03-01 21:03           ` Logan Gunthorpe
2018-03-01 21:10             ` Jerome Glisse
2018-03-01 21:15               ` Logan Gunthorpe
2018-03-01 21:25                 ` Jerome Glisse
2018-03-01 21:37               ` Stephen  Bates
2018-03-02 21:38               ` Stephen  Bates
2018-03-02 22:09                 ` Jerome Glisse
2018-03-05 20:36                   ` Stephen  Bates
2018-03-01 20:55         ` Logan Gunthorpe
2018-03-01 18:09     ` Stephen  Bates
2018-03-01 20:32       ` Benjamin Herrenschmidt
2018-03-01 19:21     ` Dan Williams
2018-03-01 19:30       ` Logan Gunthorpe
2018-03-01 20:34       ` Benjamin Herrenschmidt
2018-03-01 20:40         ` Benjamin Herrenschmidt
2018-03-01 20:53           ` Jason Gunthorpe
2018-03-01 20:57             ` Logan Gunthorpe
2018-03-01 22:06             ` Benjamin Herrenschmidt
2018-03-01 22:31               ` Linus Torvalds
2018-03-01 22:34                 ` Benjamin Herrenschmidt
2018-03-02 16:22                   ` Kani, Toshi
2018-03-02 16:57                     ` Linus Torvalds
2018-03-02 17:34                       ` Linus Torvalds
2018-03-02 17:38                       ` Kani, Toshi
2018-03-01 21:37         ` Dan Williams
2018-03-01 21:45           ` Logan Gunthorpe
2018-03-01 21:57             ` Logan Gunthorpe
2018-03-01 23:00               ` Benjamin Herrenschmidt
2018-03-01 23:19                 ` Logan Gunthorpe
2018-03-01 23:25                   ` Benjamin Herrenschmidt
2018-03-02 21:44                     ` Benjamin Herrenschmidt
2018-03-02 22:24                       ` Logan Gunthorpe
2018-03-01 23:26                   ` Benjamin Herrenschmidt
2018-03-01 23:54                     ` Logan Gunthorpe
2018-03-01 21:03       ` Benjamin Herrenschmidt
2018-03-01 21:11         ` Logan Gunthorpe
2018-03-01 21:18           ` Jerome Glisse
2018-03-01 21:22             ` Logan Gunthorpe
2018-03-01 10:31 ` Sagi Grimberg
2018-03-01 19:33   ` Logan Gunthorpe

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