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authorPeter Maydell <peter.maydell@linaro.org>2016-11-04 16:27:17 +0000
committerStefan Hajnoczi <stefanha@redhat.com>2016-11-08 18:16:48 +0000
commit3b0fc80dd8ed9bd1ac738898e4fbd70c4a618925 (patch)
tree437183321c9207ef18940d324388d79de74d3c88
parent207faf24c58859f5240f66bf6decc33b87a1776e (diff)
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>
-rw-r--r--docs/tracing.txt7
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.