mirror of https://github.com/xemu-project/xemu.git
docs/tracing.txt: Update documentation of default backend
In commit baf86d6b3c
we switched the default trace backend from "nop"
to "log". Update the documentation to match.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1478276837-31780-1-git-send-email-peter.maydell@linaro.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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@ -150,13 +150,16 @@ The trace backends are chosen at configure time:
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For a list of supported trace backends, try ./configure --help or see below.
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If multiple backends are enabled, the trace is sent to them all.
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If no backends are explicitly selected, configure will default to the
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"log" backend.
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The following subsections describe the supported trace backends.
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=== Nop ===
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The "nop" backend generates empty trace event functions so that the compiler
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can optimize out trace events completely. This is the default and imposes no
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performance penalty.
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can optimize out trace events completely. This imposes no performance
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penalty.
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Note that regardless of the selected trace backend, events with the "disable"
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property will be generated with the "nop" backend.
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