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From: "Javier González" <javier@javigon.com>
To: Kanchan Joshi <joshi.k@samsung.com>
Cc: linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
	linux-ext4@vger.kernel.org, linux-nvme@lists.infradead.org,
	jack@suse.com, david@fromorbit.com, tytso@mit.edu,
	prakash.v@samsung.com
Subject: Re: [PATCH v2 0/4] Write-hint for FS journal
Date: Wed, 23 Jan 2019 19:35:39 +0100
Message-ID: <B766FDC6-0B26-4D25-95B6-26807D3E2C79@javigon.com> (raw)
In-Reply-To: <1547047861-7271-1-git-send-email-joshi.k@samsung.com>

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> On 9 Jan 2019, at 16.30, Kanchan Joshi <joshi.k@samsung.com> 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.
> - remove mount-option to specify write-hint, as recommended by Jan kara &
>  Dave chinner. Rather, FS always sets write-hint for journal. This gets ignored
>  if device does not support stream.
> - Removed code-redundancy for write_dirty_buffer (Jan kara's review comment)
> 
> 
> Kanchan Joshi (4):
>  block: Increase count of supported write-hints
>  fs: introduce four macros for in-kernel hints
>  fs: introduce APIs to enable sending write-hint with buffer-head
>  fs/ext4,jbd2: add support for passing write-hint with journal.
> 
> fs/buffer.c                 | 18 ++++++++++++++++--
> fs/ext4/super.c             |  2 ++
> fs/jbd2/commit.c            | 11 +++++++----
> fs/jbd2/journal.c           |  3 ++-
> fs/jbd2/revoke.c            |  3 ++-
> include/linux/blkdev.h      |  5 ++++-
> include/linux/buffer_head.h |  3 +++
> include/linux/fs.h          |  5 +++++
> include/linux/jbd2.h        |  8 ++++++++
> 9 files changed, 49 insertions(+), 9 deletions(-)
> 
> --
> 2.7.4

Worth sharing the paper where you describe the design and the numbers
you collected [1]. Also, addressing Dave's comment on stream support, it
points to a Samsung drive supporting streams (PM963). In this context,
you should verify in V3 that we are at least passing xfstests and
blktests with these changes.

[1] https://www.usenix.org/system/files/conference/fast18/fast18-rho.pdf

Javier

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  parent 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   ` Javier González [this message]
2019-01-24  8:29   ` [PATCH v2 0/4] Write-hint for FS journal 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
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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