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From: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
To: "Javier González" <javier@javigon.com>,
	"Max Gurtovoy" <mgurtovoy@nvidia.com>
Cc: SelvaKumar S <selvakuma.s1@samsung.com>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"axboe@kernel.dk" <axboe@kernel.dk>,
	Damien Le Moal <Damien.LeMoal@wdc.com>,
	"kch@kernel.org" <kch@kernel.org>,
	"sagi@grimberg.me" <sagi@grimberg.me>,
	"snitzer@redhat.com" <snitzer@redhat.com>,
	"selvajove@gmail.com" <selvajove@gmail.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"nj.shetty@samsung.com" <nj.shetty@samsung.com>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"dm-devel@redhat.com" <dm-devel@redhat.com>,
	"joshi.k@samsung.com" <joshi.k@samsung.com>,
	"kbusch@kernel.org" <kbusch@kernel.org>,
	"joshiiitr@gmail.com" <joshiiitr@gmail.com>,
	"hch@lst.de" <hch@lst.de>
Subject: Re: [RFC PATCH v5 0/4] add simple copy support
Date: Tue, 13 Apr 2021 18:36:21 +0000	[thread overview]
Message-ID: <BYAPR04MB4965A79071C8DC9DA9D49FC8864F9@BYAPR04MB4965.namprd04.prod.outlook.com> (raw)
In-Reply-To: <20210413182558.v2lynge6aleazgbv@mpHalley.localdomain>

On 4/13/21 11:26, Javier González wrote:
>>> I believe there is space for extensions to simple copy. But given the
>>> experience with XCOPY, I can imagine that changes will be incremental,
>>> based on very specific use cases.
>>>
>>> I think getting support upstream and bringing deployed cases is a very
>>> good start.
>> Copying data (files) within the controller/subsystem from ns_A to ns_B 
>> using NVMf will reduce network BW and memory BW in the host server.
>>
>> This feature is well known and the use case is well known.
> Definitely.
>

I've a working code for nvmet for simple copy, I'm waiting to resolve
the host interface for REQ_OP_COPY so I can post it with this series.

Let me know if someone wants to collaborate offline on that.

IMHO we first need to sort out the host side interface which is
a challenge for years and it is not that easy to get it right
based on the history.



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      reply	other threads:[~2021-04-13 18:38 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210219124555epcas5p1334e7c4d64ada5dc4a2ca0feb48c1d44@epcas5p1.samsung.com>
2021-02-19 12:45 ` SelvaKumar S
     [not found]   ` <CGME20210219124559epcas5p41da46f1c248e334953d407a154697903@epcas5p4.samsung.com>
2021-02-19 12:45     ` [RFC PATCH v5 1/4] block: make bio_map_kern() non static SelvaKumar S
     [not found]   ` <CGME20210219124603epcas5p33add0f2c1781b2a4d71bf30c9e1ac647@epcas5p3.samsung.com>
2021-02-19 12:45     ` [RFC PATCH v5 2/4] block: add simple copy support SelvaKumar S
2021-02-20  4:59       ` Damien Le Moal
2021-04-07 11:32         ` Selva Jove
2021-04-12  0:24           ` Damien Le Moal
2021-04-12 14:34             ` Selva Jove
2021-04-13  0:32               ` Damien Le Moal
2021-04-14  6:58                 ` Selva Jove
     [not found]   ` <CGME20210219124608epcas5p2a673f9e00c3e7b5352f115497b0e2d98@epcas5p2.samsung.com>
2021-02-19 12:45     ` [RFC PATCH v5 3/4] nvme: " SelvaKumar S
2021-02-20  3:36       ` Matthew Wilcox
2021-02-22 15:57         ` Selva Jove
     [not found]   ` <CGME20210219124611epcas5p1c775b63b537e75da161556e375fcf05e@epcas5p1.samsung.com>
2021-02-19 12:45     ` [RFC PATCH v5 4/4] dm kcopyd: add simple copy offload support SelvaKumar S
2021-02-20 18:01   ` [RFC PATCH v5 0/4] add simple copy support David Laight
2021-02-20 19:08     ` Matthew Wilcox
2021-02-20 19:19     ` Keith Busch
2021-02-21 23:52   ` Dave Chinner
2021-02-23  9:14     ` Selva Jove
2021-02-22  1:31   ` Ming Lei
2021-02-22  6:52   ` Su Yue
2021-02-23  9:00     ` Selva Jove
2021-04-10  0:21   ` Max Gurtovoy
2021-04-10  0:29     ` Chaitanya Kulkarni
2021-04-10  6:32       ` Javier González
2021-04-11  9:10         ` Max Gurtovoy
2021-04-11 19:26           ` Javier González
2021-04-13 15:38             ` Max Gurtovoy
2021-04-13 18:25               ` Javier González
2021-04-13 18:36                 ` Chaitanya Kulkarni [this message]

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