From: Lin Ming <ming.m.lin@intel.com>
To: Jens Axboe <axboe@kernel.dk>,
Alan Stern <stern@rowland.harvard.edu>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Shaohua Li <shli@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-scsi@vger.kernel.org
Subject: [PATCH v5 0/4] block layer runtime pm
Date: Fri, 6 Jul 2012 12:04:28 +0800 [thread overview]
Message-ID: <1341547472-6863-1-git-send-email-ming.m.lin@intel.com> (raw)
In August 2010, Jens and Alan discussed about "Runtime PM and the block
layer". http://marc.info/?t=128259108400001&r=1&w=2
Here are the v5 patches to implement the ideas discussed.
Welcome to give it a try.
git pull git://git.kernel.org/pub/scm/linux/kernel/git/mlin/linux.git block_pm
The test steps, for example
# ls -l /sys/block/sda
/sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda
# echo auto > /sys/devices/pci0000:00/0000:00:1f.2/ata1/power/control
# echo auto > /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/power/control
# echo 10000 > /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/power/autosuspend_delay_ms
Then you'll see sda is suspended after 10secs idle.
# cat /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/power/runtime_status
suspended
And if you do some IO, it will resume immediately.
v5:
- rename scsi_execute_req to scsi_execute_req_flags
and wrap scsi_execute_req around it.
- add detail function descriptions in patch 2 log
- define static helper functions to do runtime pm work on block layer
and put the definitions inside a #ifdef block
v4:
- add CONFIG_PM_RUNTIME check
- update queue runtime pm status after system resume
- use pm_runtime_autosuspend instead of pm_request_autosuspend in scsi_runtime_idle
- always count PM request
v3:
- remove block layer suspend/resume callbacks
- add block layer runtime pm helper functions
v2:
- remove queue idle timer, use runtime pm core's auto suspend
Lin Ming (4):
block: add a flag to identify PM request
block: add runtime pm helpers
block: implement runtime pm strategy
[SCSI] sd: change to auto suspend mode
block/blk-core.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
block/elevator.c | 4 ++++
drivers/scsi/scsi_lib.c | 9 ++++-----
drivers/scsi/scsi_pm.c | 38 ++++++++++++++++++++++++++++++--------
drivers/scsi/scsi_sysfs.c | 2 ++
drivers/scsi/sd.c | 16 +++++-----------
include/linux/blk_types.h | 2 ++
include/linux/blkdev.h | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/scsi/scsi_device.h | 17 +++++++++++++----
9 files changed, 194 insertions(+), 28 deletions(-)
next reply other threads:[~2012-07-06 4:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-06 4:04 Lin Ming [this message]
2012-07-06 4:04 ` [PATCH v5 1/4] block: add a flag to identify PM request Lin Ming
2012-07-06 4:04 ` [PATCH v5 2/4] block: add runtime pm helpers Lin Ming
2012-07-06 4:04 ` [PATCH v5 3/4] block: implement runtime pm strategy Lin Ming
2012-07-06 5:00 ` James Bottomley
2012-07-06 6:07 ` Lin Ming
2012-07-06 8:05 ` James Bottomley
2012-07-06 14:59 ` Alan Stern
2013-01-14 7:18 ` Aaron Lu
2012-07-06 7:27 ` Matthew Wilcox
2012-07-06 14:21 ` Alan Stern
2012-07-06 14:51 ` Lin Ming
2012-07-06 4:04 ` [PATCH v5 4/4] [SCSI] sd: change to auto suspend mode Lin Ming
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