[RFC PATCH v3 0/4]: block layer runtime pm
From: Lin Ming
Date: Tue May 22 2012 - 03:22:27 EST
Hi,
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 RFC v3 patches that try 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.
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 | 71 ++++++++++++++++++++++++++++++++++++++++++++
block/elevator.c | 9 +++++
drivers/scsi/scsi_lib.c | 25 +++++++++++++--
drivers/scsi/scsi_pm.c | 27 ++++++++++++----
drivers/scsi/scsi_sysfs.c | 2 +
drivers/scsi/sd.c | 19 ++++--------
include/linux/blk_types.h | 2 +
include/linux/blkdev.h | 13 ++++++++
include/scsi/scsi_device.h | 4 ++
9 files changed, 149 insertions(+), 23 deletions(-)
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