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authorStefan Hajnoczi <stefanha@redhat.com>2016-11-09 12:44:16 +0000
committerStefan Hajnoczi <stefanha@redhat.com>2016-11-09 12:44:16 +0000
commit9b4b0350264d8164996265d635c8b9599673afb4 (patch)
tree40efd0c35bddfe9562cf64e07e70e551b63c44ea
parentf70073df4a562efafc2e245515837fba673efb3d (diff)
parent3b0fc80dd8ed9bd1ac738898e4fbd70c4a618925 (diff)
Merge remote-tracking branch 'public/tags/tracing-pull-request' into staging
# gpg: Signature made Tue 08 Nov 2016 06:17:13 PM GMT # gpg: using RSA key 0x9CA4ABB381AB73C8 # gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" # gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>" # Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35 775A 9CA4 ABB3 81AB 73C8 * 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>
-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.