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trace: document how to specify multiple --trace patterns 

It is possible to repeat the --trace option to specify multiple
patterns. This may be preferrable to users who do not want to create a
file with a list of patterns.

Suggested-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20210112165859.225534-2-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2021-01-12 16:58:58 +00:00
parent c6e93c9d62
commit 3faf22ef44
1 changed files with 7 additions and 2 deletions
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9
docs/devel/tracing.rst
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@ -22,10 +22,15 @@ events::
This output comes from the "log" trace backend that is enabled by default when
``./configure --enable-trace-backends=BACKENDS`` was not explicitly specified.
More than one trace event pattern can be specified by providing a file
instead::
Multiple patterns can be specified by repeating the ``--trace`` option::
$ qemu --trace "kvm_*" --trace "virtio_*" ...
When patterns are used frequently it is more convenient to store them in a
file to avoid long command-line options::
$ echo "memory_region_ops_*" >/tmp/events
$ echo "kvm_*" >>/tmp/events
$ qemu --trace events=/tmp/events ...
Trace events