Sometimes it is useful to disable a trace event. Removing the event
from trace-events is not enough since source code will call the
trace_*() function for the event.
This patch makes it easy to build without specific trace events by
marking them disabled in trace-events:
disable multiwrite_cb(void *mcb, int ret) "mcb %p ret %d"
This builds without the multiwrite_cb trace event.
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxxxxxxxxxx>
---
v2:
* This patch is new in v2
trace-events | 4 +++-
tracetool | 10 ++++++++--
2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/trace-events b/trace-events
index a37d3cc..5efaa86 100644
--- a/trace-events
+++ b/trace-events
@@ -12,10 +12,12 @@
#
# Format of a trace event:
#
-# <name>(<type1> <arg1>[, <type2> <arg2>] ...) "<format-string>"
+# [disable] <name>(<type1> <arg1>[, <type2> <arg2>] ...) "<format-string>"
#
# Example: qemu_malloc(size_t size) "size %zu"
#
+# The "disable" keyword will build without the trace event.
+#
# The <name> must be a valid as a C function name.
#
# Types should be standard C types. Use void * for pointers because the trace
diff --git a/tracetool b/tracetool
index 766a9ba..53d3612 100755
--- a/tracetool
+++ b/tracetool
@@ -110,7 +110,7 @@ linetoc_end_nop()
# Process stdin by calling begin, line, and end functions for the backend
convert()
{
- local begin process_line end
+ local begin process_line end str disable
begin="lineto$1_begin_$backend"
process_line="lineto$1_$backend"
end="lineto$1_end_$backend"
@@ -123,8 +123,14 @@ convert()
str=${str%%#*}
test -z "$str" && continue
+ # Process the line. The nop backend handles disabled lines.
+ disable=${str%%disable*}
echo
- "$process_line" "$str"
+ if test -z "$disable"; then
+ "lineto$1_nop" "${str##disable}"
+ else
+ "$process_line" "$str"
+ fi
done
echo
--
1.7.1
--
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