From 03727e6a06087dc8f46d5674b4b29262bf7377a4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Llu=C3=ADs?= Date: Wed, 31 Aug 2011 20:31:45 +0200 Subject: trace: [simple] disable all trace points by default MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Note that this refers to the backend-specific state (whether the output must be generated), not the event "disabled" property (which always uses the "nop" backend). Signed-off-by: Lluís Vilanova --- docs/tracing.txt | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'docs') diff --git a/docs/tracing.txt b/docs/tracing.txt index 85793cf17..d1d4e8cba 100644 --- a/docs/tracing.txt +++ b/docs/tracing.txt @@ -12,11 +12,16 @@ for debugging, profiling, and observing execution. ./configure --trace-backend=simple make -2. Run the virtual machine to produce a trace file: +2. Create a file with the events you want to trace: - qemu ... # your normal QEMU invocation + echo bdrv_aio_readv > /tmp/events + echo bdrv_aio_writev >> /tmp/events -3. Pretty-print the binary trace file: +3. Run the virtual machine to produce a trace file: + + qemu -trace events=/tmp/events ... # your normal QEMU invocation + +4. Pretty-print the binary trace file: ./simpletrace.py trace-events trace-* -- cgit v1.2.3