lkml.org 
[lkml]   [2018]   [Jan]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH 0/3] f2fs: support passing down write hints to block layer
Date
From: Hyunchul Lee <cheol.lee@lge.com>

This set implements passing down write hints to block layer with the
following mapping. This mapping equals the conclusion from discussion in
the link, https://sourceforge.net/p/linux-f2fs/mailman/message/36170969/

But there are two exceptions. (1) the 'iohint_mode' mount option is changed
to 'whint_mode'. (2) in "user-based" mode, WRITE_LIFE_EXTREME is passed
down instead of WRITE_LIFE_NOT_SET for files flagged with ioctl(COLD) and
extension list.

Sorry for late patch.

1) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.

2) whint_mode=user-based. F2FS tries to pass down hints given by
users.

User F2FS Block
---- ---- -----
META WRITE_LIFE_NOT_SET
HOT_NODE "
WARM_NODE "
COLD_NODE "
*ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
*extension list " "

-- buffered io
WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
WRITE_LIFE_NONE " "
WRITE_LIFE_MEDIUM " "
WRITE_LIFE_LONG " "

-- direct io
WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
WRITE_LIFE_NONE " WRITE_LIFE_NONE
WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
WRITE_LIFE_LONG " WRITE_LIFE_LONG

3) whint_mode=fs-based. F2FS passes down hints with its policy.

User F2FS Block
---- ---- -----
META WRITE_LIFE_MEDIUM;
HOT_NODE WRITE_LIFE_NOT_SET
WARM_NODE "
COLD_NODE WRITE_LIFE_NONE
ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
extension list " "

-- buffered io
WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_LONG
WRITE_LIFE_NONE " "
WRITE_LIFE_MEDIUM " "
WRITE_LIFE_LONG " "

-- direct io
WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
WRITE_LIFE_NONE " WRITE_LIFE_NONE
WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
WRITE_LIFE_LONG " WRITE_LIFE_LONG

Hyunchul Lee (3):
f2fs: support passing down write hints given by users to block layer
f2fs: support passing down write hints to block layer with F2FS policy
f2fs: Add the 'whint_mode' mount option to f2fs documentation

Documentation/filesystems/f2fs.txt | 6 +++
fs/f2fs/data.c | 27 ++++++++--
fs/f2fs/f2fs.h | 10 ++++
fs/f2fs/segment.c | 104 +++++++++++++++++++++++++++++++++++++
fs/f2fs/super.c | 29 ++++++++++-
5 files changed, 170 insertions(+), 6 deletions(-)

--
1.9.1

\
 
 \ /
  Last update: 2018-01-22 11:50    [W:0.022 / U:2.356 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site