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| -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 |