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trace: document '-' syntax for disabling events

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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Stefan Hajnoczi 2012-11-05 08:48:29 +01:00
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commit 8f5a0fb1f4
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docs/tracing.txt
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@ -139,6 +139,10 @@ having a common prefix in a batch. For example, virtio-blk trace events could
be enabled using: be enabled using:
trace-event virtio_blk_* on trace-event virtio_blk_* on
If a line in the "-trace events=<file>" file begins with a '-', the trace event
will be disabled instead of enabled. This is useful when a wildcard was used
to enable an entire family of events but one noisy event needs to be disabled.
== Trace backends == == Trace backends ==
The "tracetool" script automates tedious trace event code generation and also The "tracetool" script automates tedious trace event code generation and also