diff options
Diffstat (limited to 'docs/tracing.txt')
| -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 85793cf173..d1d4e8cba2 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-* |