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trace: fix simpletrace doc mismerge 

The simpletrace documentation section was accidentally split when the
ftrace section was introduced. Move the simpletrace-specific
documentation back into the simpletrace section.

Fixes: e64dd5efb2 ("trace: document ftrace backend")
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20201216160923.722894-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2020-12-16 16:09:21 +00:00
parent 74208cd252
commit c72e3e4842
1 changed files with 17 additions and 17 deletions
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34
docs/devel/tracing.txt
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@ -218,6 +218,23 @@ source tree. It may not be as powerful as platform-specific or third-party
trace backends but it is portable. This is the recommended trace backend
unless you have specific needs for more advanced backends.
==== Monitor commands ====
* trace-file on|off|flush|set <path>
Enable/disable/flush the trace file or set the trace file name.
==== Analyzing trace files ====
The "simple" backend produces binary trace files that can be formatted with the
simpletrace.py script. The script takes the "trace-events-all" file and the
binary trace:
./scripts/simpletrace.py trace-events-all trace-12345
You must ensure that the same "trace-events-all" file was used to build QEMU,
otherwise trace event declarations may have changed and output will not be
consistent.
=== Ftrace ===
The "ftrace" backend writes trace data to ftrace marker. This effectively
@ -246,23 +263,6 @@ NOTE: syslog may squash duplicate consecutive trace events and apply rate
Restriction: "syslog" backend is restricted to POSIX compliant OS.
==== Monitor commands ====
* trace-file on|off|flush|set <path>
Enable/disable/flush the trace file or set the trace file name.
==== Analyzing trace files ====
The "simple" backend produces binary trace files that can be formatted with the
simpletrace.py script. The script takes the "trace-events-all" file and the
binary trace:
./scripts/simpletrace.py trace-events-all trace-12345
You must ensure that the same "trace-events-all" file was used to build QEMU,
otherwise trace event declarations may have changed and output will not be
consistent.
=== LTTng Userspace Tracer ===
The "ust" backend uses the LTTng Userspace Tracer library. There are no