trace child processes, add header information about valgrind events to report

Signed-off-by: Ava Hahn <a.hahn@f5.com>

kaproxy/run.sh

@@ -1,9 +1,8 @@
 #!/bin/bash
 
 function p_invoke() {
-	# set trace-children=yes to profile worker processes
 	valgrind --tool=callgrind                         \
-		--trace-children=no                           \
+		--trace-children=yes                          \
 		--callgrind-out-file=/tmp/callgrind.output    \
 		--cache-sim=yes                               \
 		/nginx/objs/nginx                             \