diff options
| author | Lluís <xscript@gmx.net> | 2011-08-31 20:31:45 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> | 2011-09-01 10:34:54 +0100 |
| commit | 03727e6a06087dc8f46d5674b4b29262bf7377a4 (patch) | |
| tree | aeae1754304b2e1ad7f0095d77385a18eb775697 /docs | |
| parent | dd215f646c72b4cf680097b13aeb8b0c589dceb2 (diff) | |
trace: [simple] disable all trace points by default
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 <vilanova@ac.upc.edu>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/tracing.txt | 11 |
1 files changed, 8 insertions, 3 deletions
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-* |