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| author | Peter Maydell <peter.maydell@linaro.org> | 2016-11-04 16:27:17 +0000 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2016-11-08 18:16:48 +0000 |
| commit | 3b0fc80dd8ed9bd1ac738898e4fbd70c4a618925 (patch) | |
| tree | 437183321c9207ef18940d324388d79de74d3c88 /docs/tracing.txt | |
| parent | 207faf24c58859f5240f66bf6decc33b87a1776e (diff) | |
| download | qemu-3b0fc80dd8ed9bd1ac738898e4fbd70c4a618925.tar.gz | |
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>
Diffstat (limited to 'docs/tracing.txt')
| -rw-r--r-- | docs/tracing.txt | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/docs/tracing.txt b/docs/tracing.txt index e62444ca68..f351998a4e 100644 --- a/docs/tracing.txt +++ b/docs/tracing.txt @@ -150,13 +150,16 @@ The trace backends are chosen at configure time: 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. |