[PATCH v7 0/2] add tracepoints for nvme command submission and completion
From: Johannes Thumshirn
Date: Wed Jan 24 2018 - 03:28:43 EST
Add tracepoints for nvme command submission and completion. The tracepoints
are modeled after SCSI's trace_scsi_dispatch_cmd_start() and
trace_scsi_dispatch_cmd_done() tracepoints and fulfil a similar purpose,
namely a fast way to check which command is going to be queued into the HW or
Fabric driver and which command is completed again.
This version is a re-base onto nvme-4.16.
Here's an example output using the qemu emulated pci nvme:
# tracer: nop
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
kworker/u8:0-5 [003] .... 9.158541: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_cq cqid=1, qsize=1023, cq_flags=0x3, irq_vector=0)
<idle>-0 [003] d.h. 9.158705: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.158712: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_sq sqid=1, qsize=1023, sq_flags=0x1, cqid=1)
<idle>-0 [003] d.h. 9.159214: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.159236: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_cq cqid=2, qsize=1023, cq_flags=0x3, irq_vector=1)
<idle>-0 [003] d.h. 9.159288: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.159293: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_sq sqid=2, qsize=1023, sq_flags=0x1, cqid=2)
<idle>-0 [003] d.h. 9.159479: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.159525: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_cq cqid=3, qsize=1023, cq_flags=0x3, irq_vector=2)
<idle>-0 [003] d.h. 9.159565: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.159569: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_sq sqid=3, qsize=1023, sq_flags=0x1, cqid=3)
<idle>-0 [003] d.h. 9.159726: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.159769: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_cq cqid=4, qsize=1023, cq_flags=0x3, irq_vector=3)
<idle>-0 [003] d.h. 9.159795: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.159799: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_create_sq sqid=4, qsize=1023, sq_flags=0x1, cqid=4)
<idle>-0 [003] d.h. 9.159957: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.160971: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_identify cns=0, ctrlid=1)
<idle>-0 [003] d.h. 9.161059: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.161101: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_identify cns=0, ctrlid=0)
<idle>-0 [003] d.h. 9.161160: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.161305: nvme_setup_admin_cmd: cmdid=14, flags=0x0, meta=0x0, cmd=(nvme_admin_identify cns=0, ctrlid=0)
<idle>-0 [003] d.h. 9.161344: nvme_complete_rq: cmdid=14, qid=0, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.161390: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=718, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=0, len=7, ctrl=0x0, dsmgmt=0, reftag=0)
<idle>-0 [003] d.h. 9.161578: nvme_complete_rq: cmdid=718, qid=1, res=0, retries=0, flags=0x0, status=0
kworker/u8:0-5 [003] .... 9.161608: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=718, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=24, len=7, ctrl=0x0, dsmgmt=0, reftag=0)
<idle>-0 [003] d.h. 9.161681: nvme_complete_rq: cmdid=718, qid=1, res=0, retries=0, flags=0x0, status=0
dd-205 [001] .... 9.662909: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=1011, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=0, len=2559, ctrl=0x0, dsmgmt=0, reftag=0)
dd-205 [001] .... 9.662967: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=1012, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=2560, len=1535, ctrl=0x0, dsmgmt=0, reftag=0)
<idle>-0 [001] d.h. 9.664413: nvme_complete_rq: cmdid=1011, qid=1, res=0, retries=0, flags=0x0, status=0
<idle>-0 [001] d.h. 9.664835: nvme_complete_rq: cmdid=1012, qid=1, res=0, retries=0, flags=0x0, status=0
dd-205 [001] .... 9.666396: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=1012, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=4096, len=2047, ctrl=0x0, dsmgmt=0, reftag=0)
dd-205 [001] .... 9.667914: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=1013, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=6144, len=2047, ctrl=0x0, dsmgmt=0, reftag=0)
<idle>-0 [001] d.h. 9.676720: nvme_complete_rq: cmdid=1012, qid=1, res=0, retries=0, flags=0x0, status=0
dd-205 [001] d.h. 9.676905: nvme_complete_rq: cmdid=1013, qid=1, res=0, retries=0, flags=0x0, status=0
dd-205 [001] .... 9.677552: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=1013, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=8192, len=2047, ctrl=0x0, dsmgmt=0, reftag=0)
dd-205 [001] .... 9.678201: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=1014, flags=0x0, meta=0x0, cmd=(nvme_cmd_read slba=10240, len=2047, ctrl=0x0, dsmgmt=0, reftag=0)
<idle>-0 [001] d.h. 9.678699: nvme_complete_rq: cmdid=1013, qid=1, res=0, retries=0, flags=0x0, status=0
dd-205 [001] d.h. 9.679330: nvme_complete_rq: cmdid=1014, qid=1, res=0, retries=0, flags=0x0, status=0
dd-206 [002] .... 9.687920: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=366, flags=0x0, meta=0x0, cmd=(nvme_cmd_write slba=0, len=2559, ctrl=0x0, dsmgmt=0, reftag=0)
dd-206 [002] .... 9.688396: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=367, flags=0x0, meta=0x0, cmd=(nvme_cmd_write slba=2560, len=2559, ctrl=0x0, dsmgmt=0, reftag=0)
dd-206 [002] .... 9.689290: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=368, flags=0x0, meta=0x0, cmd=(nvme_cmd_write slba=5120, len=2559, ctrl=0x0, dsmgmt=0, reftag=0)
dd-206 [002] .... 9.689759: nvme_setup_nvm_cmd: qid=1, nsid=1, cmdid=369, flags=0x0, meta=0x0, cmd=(nvme_cmd_write slba=7680, len=2559, ctrl=0x0, dsmgmt=0, reftag=0)
<idle>-0 [002] d.h. 9.690222: nvme_complete_rq: cmdid=366, qid=1, res=0, retries=0, flags=0x0, status=0
<idle>-0 [002] d.h. 9.691086: nvme_complete_rq: cmdid=367, qid=1, res=0, retries=0, flags=0x0, status=0
<idle>-0 [002] d.h. 9.691935: nvme_complete_rq: cmdid=368, qid=1, res=0, retries=0, flags=0x0, status=0
<idle>-0 [002] d.h. 9.692852: nvme_complete_rq: cmdid=369, qid=1, res=0, retries=0, flags=0x0, status=0
Johannes Thumshirn (2):
nvme: add tracepoint for nvme_setup_cmd
nvme: add tracepoint for nvme_complete_rq
drivers/nvme/host/Makefile | 4 ++
drivers/nvme/host/core.c | 9 +++
drivers/nvme/host/trace.c | 131 +++++++++++++++++++++++++++++++++++
drivers/nvme/host/trace.h | 167 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 311 insertions(+)
create mode 100644 drivers/nvme/host/trace.c
create mode 100644 drivers/nvme/host/trace.h
--
2.13.6