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From: Keith Busch <keith.busch@intel.com>
To: Jan Kara <jack@suse.cz>
Cc: Kanchan Joshi <joshi.k@samsung.com>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"jack@suse.com" <jack@suse.com>,
	"david@fromorbit.com" <david@fromorbit.com>,
	"tytso@mit.edu" <tytso@mit.edu>,
	"prakash.v@samsung.com" <prakash.v@samsung.com>
Subject: Re: [PATCH v2 0/4] Write-hint for FS journal
Date: Mon, 28 Jan 2019 16:24:24 -0700
Message-ID: <20190128232423.GD15302@localhost.localdomain> (raw)
In-Reply-To: <20190128124709.GB27972@quack2.suse.cz>

On Mon, Jan 28, 2019 at 04:47:09AM -0800, Jan Kara wrote:
> On Fri 25-01-19 09:23:53, Keith Busch wrote:
> > On Wed, Jan 09, 2019 at 09:00:57PM +0530, Kanchan Joshi wrote:
> > > Towards supporing write-hints/streams for filesystem journal.                   
> > >                                                                                 
> > > Here is the v1 patch for background -                                           
> > > https://marc.info/?l=linux-fsdevel&m=154444637519020&w=2                        
> > >                                                                                 
> > > Changes since v1:                                                               
> > > - introduce four more hints for in-kernel use, as recommended by Dave chinner   
> > >   & Jens axboe. This isolates kernel-mode hints from user-mode ones.            
> > 
> > The nvme driver disables streams if the controller doesn't support
> > BLK_MAX_WRITE_HINT number of streams, so this series breaks the feature
> > for controllers that only support up to 4.
> 
> Right. Do you know if there are such controllers? Or are you just afraid
> that there could be?

I've asked around, and the concensus I received is all currently support
at least 8, but they couldn't say if that would be true for potential
lower budget products. Can we implement a reasonable fallback to use
what's available?

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190109153328epcas2p4643cbdc7a2182b47893a2bcaa0778e17@epcas2p4.samsung.com>
2019-01-09 15:30 ` Kanchan Joshi
     [not found]   ` <CGME20190109153332epcas1p187b419176a8d1d0be4982a275c0b9e86@epcas1p1.samsung.com>
2019-01-09 15:30     ` [PATCH 1/4] block: Increase count of supported write-hints Kanchan Joshi
     [not found]   ` <CGME20190109153336epcas2p29b3275b6c545e483a3f43b92268f08bf@epcas2p2.samsung.com>
2019-01-09 15:30     ` [PATCH 2/4] fs: introduce four macros for in-kernel hints Kanchan Joshi
2019-01-23 18:27       ` [PATCH 2/4] " Javier González
2019-01-24  8:35         ` Jan Kara
2019-01-24  9:23           ` Javier González
     [not found]   ` <CGME20190109153339epcas2p4691a898dde0174a7565d62fcb3be0b6d@epcas2p4.samsung.com>
2019-01-09 15:31     ` [PATCH 3/4] fs: introduce APIs to enable sending write-hint with buffer-head Kanchan Joshi
     [not found]   ` <CGME20190109153342epcas2p3208f62a4dd876f8e1765b48f8aec2432@epcas2p3.samsung.com>
2019-01-09 15:31     ` [PATCH 4/4] fs/ext4,jbd2: add support for passing write-hint with journal Kanchan Joshi
2019-01-24  8:50       ` Jan Kara
2019-01-23 18:35   ` [PATCH v2 0/4] Write-hint for FS journal Javier González
2019-01-24  8:29   ` Jan Kara
2019-01-25 14:20     ` Kanchan Joshi
2019-01-25 16:23   ` Keith Busch
2019-01-28 12:47     ` Jan Kara
2019-01-28 23:24       ` Keith Busch [this message]
2019-01-29 10:07         ` Jan Kara
2019-01-30  0:13           ` Dave Chinner
2019-01-30 13:54             ` Kanchan Joshi
2019-02-05 11:50               ` Jan Kara
2019-02-05 22:53                 ` Dave Chinner

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