[PATCH v3 0/9] blk-mq: Enable runtime power management

Bart Van Assche
2018-08-02T18:29:35Z

Hello Jens,

This patch series not only enables runtime power management for blk-mq but
also fixes a starvation issue in the power management code for the legacy
block layer. Please consider this patch series for kernel v4.19.

Thanks,

Bart.

Changes compared to v2:
- Fixed the build for CONFIG_BLOCK=n.
- Added a patch that introduces percpu_ref_read() in the percpu-counter code.
- Added a patch that makes it easier to detect missing pm_runtime_get*() calls.
- Addressed Jianchao's feedback including the comment about runtime overhead
of switching a per-cpu counter to atomic mode.

Changes compared to v1:
- Moved the runtime power management code into a separate file.
- Addressed Ming's feedback.

Bart Van Assche (9):
block: Fix a comment in a header file
block: Move power management functions into new source files
block: Serialize queue freezing and blk_pre_runtime_suspend()
percpu-refcount: Introduce percpu_ref_read()
block, scsi: Rework runtime power management
block: Warn if pm_runtime_get*() has not been called
block: Remove blk_pm_requeue_request()
blk-mq: Insert blk_pm_{add,put}_request() calls
blk-mq: Enable support for runtime power management

block/Kconfig | 5 +
block/Makefile | 1 +
block/blk-core.c | 246 +++----------------------------
block/blk-mq-debugfs.c | 1 -
block/blk-mq-sched.c | 13 +-
block/blk-mq.c | 11 ++
block/blk-pm.c | 253 ++++++++++++++++++++++++++++++++
block/blk-pm.h | 35 +++++
block/elevator.c | 24 +--
drivers/scsi/scsi_pm.c | 1 +
drivers/scsi/sd.c | 5 +-
drivers/scsi/sr.c | 1 +
drivers/scsi/ufs/ufshcd.c | 10 +-
include/linux/blk-pm.h | 30 ++++
include/linux/blkdev.h | 37 +----
include/linux/percpu-refcount.h | 2 +
lib/percpu-refcount.c | 29 ++++
17 files changed, 420 insertions(+), 284 deletions(-)
create mode 100644 block/blk-pm.c
create mode 100644 block/blk-pm.h
create mode 100644 include/linux/blk-pm.h

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2.18.0