| Message ID | 20180802182944.14442-1-bart.vanassche@wdc.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | blk-mq: Enable runtime power management | expand |
On 8/2/18 12:29 PM, Bart Van Assche wrote: > 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. Looks good to me, but would be nice to get Tejun onboard with the percpu change. We'll need his ack to get this applied.
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