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trace: [simple] disable all trace points by default

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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>
This commit is contained in:
Lluís 2011-08-31 20:31:45 +02:00 committed by Stefan Hajnoczi
parent dd215f646c
commit 03727e6a06
3 changed files with 10 additions and 13 deletions
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11
docs/tracing.txt
View File

@ -12,11 +12,16 @@ for debugging, profiling, and observing execution.
./configure --trace-backend=simple ./configure --trace-backend=simple
make 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-* ./simpletrace.py trace-events trace-*

9
scripts/tracetool
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@ -221,15 +221,10 @@ EOF
linetoc_simple() linetoc_simple()
{ {
local name state local name
name=$(get_name "$1") name=$(get_name "$1")
if has_property "$1" "disable"; then
state="0"
else
state="1"
fi
cat <<EOF cat <<EOF
{.tp_name = "$name", .state=$state}, {.tp_name = "$name", .state=0},
EOF EOF
simple_event_num=$((simple_event_num + 1)) simple_event_num=$((simple_event_num + 1))
} }

3
trace-events
View File

@ -17,9 +17,6 @@
# Example: qemu_malloc(size_t size) "size %zu" # Example: qemu_malloc(size_t size) "size %zu"
# #
# The "disable" keyword will build without the trace event. # The "disable" keyword will build without the trace event.
# In case of 'simple' trace backend, it will allow the trace event to be
# compiled, but this would be turned off by default. It can be toggled on via
# the monitor.
# #
# The <name> must be a valid as a C function name. # The <name> must be a valid as a C function name.
# #