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From: David Laight <David.Laight@ACULAB.COM>
To: 'SelvaKumar S' <selvakuma.s1@samsung.com>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
	"damien.lemoal@wdc.com" <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>,
	"javier.gonz@samsung.com" <javier.gonz@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: Sat, 20 Feb 2021 18:01:56 +0000	[thread overview]
Message-ID: <146c47907c2446d4a896830de400dd81@AcuMS.aculab.com> (raw)
In-Reply-To: <20210219124517.79359-1-selvakuma.s1@samsung.com>

From: SelvaKumar S
> Sent: 19 February 2021 12:45
> 
> This patchset tries to add support for TP4065a ("Simple Copy Command"),
> v2020.05.04 ("Ratified")
> 
> The Specification can be found in following link.
> https://nvmexpress.org/wp-content/uploads/NVM-Express-1.4-Ratified-TPs-1.zip
> 
> Simple copy command is a copy offloading operation and is  used to copy
> multiple contiguous ranges (source_ranges) of LBA's to a single destination
> LBA within the device reducing traffic between host and device.

Sounds to me like the real reason is that the copy just ends up changing
some indirect block pointers rather than having to actually copy the data.

	David

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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
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  parent reply	other threads:[~2021-02-20 18:02 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   ` David Laight [this message]
2021-02-20 19:08     ` [RFC PATCH v5 0/4] add simple copy support 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

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