From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lin Ming Subject: [RFC v2 PATCH 0/4]: block layer runtime pm Date: Thu, 17 May 2012 23:48:02 +0800 Message-ID: <1337269686-3781-1-git-send-email-ming.m.lin@intel.com> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Jens Axboe , Alan Stern , Jeff Moyer Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-scsi@vger.kernel.org List-Id: linux-scsi@vger.kernel.org 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 v2 patches that try to implement the ideas discussed. And it's a workable version now. Welcome to give it a try. 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 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. 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 queue runtime pm callbacks block: implement block layer runtime pm [SCSI] sd: change to auto suspend mode block/blk-core.c | 12 +++++++ block/blk-settings.c | 8 +++++ block/elevator.c | 9 +++++ drivers/scsi/scsi_lib.c | 25 +++++++++++++-- drivers/scsi/scsi_pm.c | 7 ++-- drivers/scsi/sd.c | 72 ++++++++++++++++++++++++++++++++++++-------- include/linux/blk_types.h | 2 + include/linux/blkdev.h | 7 ++++ include/scsi/scsi_device.h | 4 ++ 9 files changed, 127 insertions(+), 19 deletions(-)