linux-nvme.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Keith Busch <kbusch@kernel.org>
To: David Laight <David.Laight@aculab.com>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
	"damien.lemoal@wdc.com" <damien.lemoal@wdc.com>,
	"kch@kernel.org" <kch@kernel.org>,
	'SelvaKumar S' <selvakuma.s1@samsung.com>,
	"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>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.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>,
	"javier.gonz@samsung.com" <javier.gonz@samsung.com>,
	"joshi.k@samsung.com" <joshi.k@samsung.com>,
	"joshiiitr@gmail.com" <joshiiitr@gmail.com>,
	"hch@lst.de" <hch@lst.de>
Subject: Re: [RFC PATCH v5 0/4] add simple copy support
Date: Sun, 21 Feb 2021 04:19:21 +0900	[thread overview]
Message-ID: <20210220191921.GA7968@redsun51.ssa.fujisawa.hgst.com> (raw)
In-Reply-To: <146c47907c2446d4a896830de400dd81@AcuMS.aculab.com>

On Sat, Feb 20, 2021 at 06:01:56PM +0000, David Laight wrote:
> 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.

I guess an implementation could do that, but I think that's missing the
point of the command. The intention is to copy the data to a new
location on the media for host managed garbage collection. 

_______________________________________________
Linux-nvme mailing list
Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme

  parent reply	other threads:[~2021-02-20 19:20 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 [this message]
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210220191921.GA7968@redsun51.ssa.fujisawa.hgst.com \
    --to=kbusch@kernel.org \
    --cc=David.Laight@aculab.com \
    --cc=axboe@kernel.dk \
    --cc=damien.lemoal@wdc.com \
    --cc=dm-devel@redhat.com \
    --cc=hch@lst.de \
    --cc=javier.gonz@samsung.com \
    --cc=joshi.k@samsung.com \
    --cc=joshiiitr@gmail.com \
    --cc=kch@kernel.org \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nvme@lists.infradead.org \
    --cc=nj.shetty@samsung.com \
    --cc=sagi@grimberg.me \
    --cc=selvajove@gmail.com \
    --cc=selvakuma.s1@samsung.com \
    --cc=snitzer@redhat.com \
    --subject='Re: [RFC PATCH v5 0/4] add simple copy support' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).