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[Qemu-devel] [PATCH 1/3] trace: Document programmatically enabling/disab
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 1/3] trace: Document programmatically enabling/disabling trace events |
Date: |
Tue, 6 Jul 2010 21:13:59 +0100 |
The simple trace backend exports a function that can be used to
programmatically enable/disable trace events at runtime.
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
This applies to the tracing branch at:
http://repo.or.cz/w/qemu/stefanha.git/shortlog/refs/heads/tracing-dev
docs/tracing.txt | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/docs/tracing.txt b/docs/tracing.txt
index ec44552..abbae6b 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -116,6 +116,17 @@ unless you have specific needs for more advanced backends.
* trace-event NAME on|off
Enable/disable a given trace event.
+==== Enabling/disabling trace events programmatically ====
+
+The change_trace_event_state() function can be used to enable or disable trace
+events at runtime inside QEMU:
+
+ #include "trace.h"
+
+ change_trace_event_state("virtio_irq", true); /* enable */
+ [...]
+ change_trace_event_state("virtio_irq", false); /* disable */
+
==== Analyzing trace files ====
The "simple" backend produces binary trace files that can be formatted with the
--
1.7.1