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Message-Id: <20180116103401.7883-1-jthumshirn@suse.de>
Date: Tue, 16 Jan 2018 11:33:59 +0100
From: Johannes Thumshirn <jthumshirn@...e.de>
To: Christoph Hellwig <hch@....de>
Cc: Sagi Grimberg <sagi@...mberg.me>,
Keith Busch <keith.busch@...el.com>,
Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
Hannes Reinecke <hare@...e.de>,
Linux NVMe Mailinglist <linux-nvme@...ts.infradead.org>,
Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH 0/2] add tracepoints for nvme command submission and completion
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.
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
# | | | |||| | |
dd-205 [002] .... 7.128368: nvme_setup_cmd: nsid=1, command_id=568, flags=0x0, metadata=0x0, cmd=(nvme_cmd_read slba=0, length=31, control=0x0, dsmgmt=0, reftag=0)
<idle>-0 [002] d.h. 7.129098: nvme_complete_rq: command_id=568, result=0, retries=0, flags=0x0, status=0
dd-205 [002] .... 7.129150: nvme_setup_cmd: nsid=1, command_id=568, flags=0x0, metadata=0x0, cmd=(nvme_cmd_read slba=32, length=63, control=0x0, dsmgmt=0, reftag=0)
dd-205 [002] .... 7.129189: nvme_setup_cmd: nsid=1, command_id=569, flags=0x0, metadata=0x0, cmd=(nvme_cmd_read slba=96, length=127, control=0x0, dsmgmt=0, reftag=0)
<idle>-0 [002] d.h. 7.129318: nvme_complete_rq: command_id=568, result=0, retries=0, flags=0x0, status=0
dd-205 [002] d.h. 7.129355: nvme_complete_rq: command_id=569, result=0, retries=0, flags=0x0, status=0
dd-206 [003] .... 7.137389: nvme_setup_cmd: nsid=1, command_id=22, flags=0x0, metadata=0x0, cmd=(nvme_cmd_write slba=0, length=2559, control=0x0, dsmgmt=0, reftag=0)
dd-206 [003] .... 7.137888: nvme_setup_cmd: nsid=1, command_id=23, flags=0x0, metadata=0x0, cmd=(nvme_cmd_write slba=2560, length=2559, control=0x0, dsmgmt=0, reftag=0)
dd-206 [003] .... 7.138365: nvme_setup_cmd: nsid=1, command_id=24, flags=0x0, metadata=0x0, cmd=(nvme_cmd_write slba=5120, length=2559, control=0x0, dsmgmt=0, reftag=0)
dd-206 [003] d.h. 7.138634: nvme_complete_rq: command_id=22, result=0, retries=0, flags=0x0, status=0
dd-206 [003] .... 7.139014: nvme_setup_cmd: nsid=1, command_id=25, flags=0x0, metadata=0x0, cmd=(nvme_cmd_write slba=7680, length=2559, control=0x0, dsmgmt=0, reftag=0)
<idle>-0 [003] d.h. 7.139658: nvme_complete_rq: command_id=23, result=0, retries=0, flags=0x0, status=0
<idle>-0 [003] d.h. 7.140650: nvme_complete_rq: command_id=24, result=0, retries=0, flags=0x0, status=0
<idle>-0 [003] d.h. 7.141670: nvme_complete_rq: command_id=25, result=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/core.c | 71 +++++++++++++++++++++++++++++++++
include/trace/events/nvme.h | 95 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 166 insertions(+)
create mode 100644 include/trace/events/nvme.h
--
2.12.3
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