From: Lin Ming <ming.m.lin@intel.com>
To: Jens Axboe <axboe@kernel.dk>,
Alan Stern <stern@rowland.harvard.edu>,
Shaohua Li <shli@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-scsi@vger.kernel.org
Subject: [PATCH v4 0/4]: block layer runtime pm
Date: Thu, 5 Jul 2012 15:26:35 +0800 [thread overview]
Message-ID: <1341473199-3837-1-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 v4 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.
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 | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
block/elevator.c | 13 +++++++++++++
drivers/scsi/scsi_lib.c | 25 ++++++++++++++++++++++---
drivers/scsi/scsi_pm.c | 32 +++++++++++++++++++++++++-------
drivers/scsi/scsi_sysfs.c | 2 ++
drivers/scsi/sd.c | 16 +++++-----------
include/linux/blk_types.h | 2 ++
include/linux/blkdev.h | 27 +++++++++++++++++++++++++++
include/scsi/scsi_device.h | 4 ++++
9 files changed, 179 insertions(+), 21 deletions(-)
next reply other threads:[~2012-07-05 7:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-05 7:26 Lin Ming [this message]
2012-07-05 7:26 ` [PATCH v4 1/4] block: add a flag to identify PM request Lin Ming
2012-07-05 13:09 ` Rafael J. Wysocki
2012-07-05 7:26 ` [PATCH v4 2/4] block: add runtime pm helpers Lin Ming
2012-07-05 13:11 ` Rafael J. Wysocki
2012-07-06 1:13 ` Lin Ming
2012-07-05 7:26 ` [PATCH v4 3/4] block: implement runtime pm strategy Lin Ming
2012-07-05 13:54 ` Alan Stern
2012-07-05 7:26 ` [PATCH v4 4/4] [SCSI] sd: change to auto suspend mode Lin Ming
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