mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-28 22:10:33 +00:00
057dc9a635
In downstream, we want to use a different name for the QEMU binary, and some people might also use the docs for non-x86 binaries, that's why we already created the |qemu_system| placeholder in the past. Use it now in the stap trace doc, too. Message-Id: <20220104103319.179870-1-thuth@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Thomas Huth <thuth@redhat.com>
126 lines
3.8 KiB
ReStructuredText
126 lines
3.8 KiB
ReStructuredText
=========================
|
|
QEMU SystemTap trace tool
|
|
=========================
|
|
|
|
Synopsis
|
|
--------
|
|
|
|
**qemu-trace-stap** [*GLOBAL-OPTIONS*] *COMMAND* [*COMMAND-OPTIONS*] *ARGS*...
|
|
|
|
Description
|
|
-----------
|
|
|
|
The ``qemu-trace-stap`` program facilitates tracing of the execution
|
|
of QEMU emulators using SystemTap.
|
|
|
|
It is required to have the SystemTap runtime environment installed to use
|
|
this program, since it is a wrapper around execution of the ``stap``
|
|
program.
|
|
|
|
Options
|
|
-------
|
|
|
|
.. program:: qemu-trace-stap
|
|
|
|
The following global options may be used regardless of which command
|
|
is executed:
|
|
|
|
.. option:: --verbose, -v
|
|
|
|
Display verbose information about command execution.
|
|
|
|
The following commands are valid:
|
|
|
|
.. option:: list BINARY PATTERN...
|
|
|
|
List all the probe names provided by *BINARY* that match
|
|
*PATTERN*.
|
|
|
|
If *BINARY* is not an absolute path, it will be located by searching
|
|
the directories listed in the ``$PATH`` environment variable.
|
|
|
|
*PATTERN* is a plain string that is used to filter the results of
|
|
this command. It may optionally contain a ``*`` wildcard to facilitate
|
|
matching multiple probes without listing each one explicitly. Multiple
|
|
*PATTERN* arguments may be given, causing listing of probes that match
|
|
any of the listed names. If no *PATTERN* is given, the all possible
|
|
probes will be listed.
|
|
|
|
For example, to list all probes available in the |qemu_system|
|
|
binary:
|
|
|
|
.. parsed-literal::
|
|
|
|
$ qemu-trace-stap list |qemu_system|
|
|
|
|
To filter the list to only cover probes related to QEMU's cryptographic
|
|
subsystem, in a binary outside ``$PATH``
|
|
|
|
.. parsed-literal::
|
|
|
|
$ qemu-trace-stap list /opt/qemu/|version|/bin/|qemu_system| 'qcrypto*'
|
|
|
|
.. option:: run OPTIONS BINARY PATTERN...
|
|
|
|
Run a trace session, printing formatted output any time a process that is
|
|
executing *BINARY* triggers a probe matching *PATTERN*.
|
|
|
|
If *BINARY* is not an absolute path, it will be located by searching
|
|
the directories listed in the ``$PATH`` environment variable.
|
|
|
|
*PATTERN* is a plain string that matches a probe name shown by the
|
|
*LIST* command. It may optionally contain a ``*`` wildcard to
|
|
facilitate matching multiple probes without listing each one explicitly.
|
|
Multiple *PATTERN* arguments may be given, causing all matching probes
|
|
to be monitored. At least one *PATTERN* is required, since stap is not
|
|
capable of tracing all known QEMU probes concurrently without overflowing
|
|
its trace buffer.
|
|
|
|
Invocation of this command does not need to be synchronized with
|
|
invocation of the QEMU process(es). It will match probes on all
|
|
existing running processes and all future launched processes,
|
|
unless told to only monitor a specific process.
|
|
|
|
Valid command specific options are:
|
|
|
|
.. program:: qemu-trace-stap-run
|
|
|
|
.. option:: --pid=PID, -p PID
|
|
|
|
Restrict the tracing session so that it only triggers for the process
|
|
identified by *PID*.
|
|
|
|
For example, to monitor all processes executing |qemu_system|
|
|
as found on ``$PATH``, displaying all I/O related probes:
|
|
|
|
.. parsed-literal::
|
|
|
|
$ qemu-trace-stap run |qemu_system| 'qio*'
|
|
|
|
To monitor only the QEMU process with PID 1732
|
|
|
|
.. parsed-literal::
|
|
|
|
$ qemu-trace-stap run --pid=1732 |qemu_system| 'qio*'
|
|
|
|
To monitor QEMU processes running an alternative binary outside of
|
|
``$PATH``, displaying verbose information about setup of the
|
|
tracing environment:
|
|
|
|
.. parsed-literal::
|
|
|
|
$ qemu-trace-stap -v run /opt/qemu/|version|/bin/|qemu_system| 'qio*'
|
|
|
|
See also
|
|
--------
|
|
|
|
:manpage:`qemu(1)`, :manpage:`stap(1)`
|
|
|
|
..
|
|
Copyright (C) 2019 Red Hat, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|