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# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
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* public/tags/tracing-pull-request:
docs/tracing.txt: Update documentation of default backend
Message-id:
1478629053-31709-1-git-send-email-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
For a list of supported trace backends, try ./configure --help or see below.
If multiple backends are enabled, the trace is sent to them all.
+If no backends are explicitly selected, configure will default to the
+"log" backend.
+
The following subsections describe the supported trace backends.
=== Nop ===
The "nop" backend generates empty trace event functions so that the compiler
-can optimize out trace events completely. This is the default and imposes no
-performance penalty.
+can optimize out trace events completely. This imposes no performance
+penalty.
Note that regardless of the selected trace backend, events with the "disable"
property will be generated with the "nop" backend.