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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2021-01-12 16:58:58 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2021-02-01 11:23:04 +0000 |
| commit | 3faf22ef4465d064617dee524c97afa8d4400d9c (patch) | |
| tree | 007fda2a052761e1e434ebb19bba6e6b2d440a2e /docs | |
| parent | c6e93c9d62c47d628d993db482839a4fd38d603f (diff) | |
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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/devel/tracing.rst | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/docs/devel/tracing.rst b/docs/devel/tracing.rst index af395e957d..e8f9b82c5e 100644 --- a/docs/devel/tracing.rst +++ b/docs/devel/tracing.rst @@ -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 |