use perf instead of gprof

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

kaproxy/run.sh

@@ -1,5 +1,14 @@
 #!/bin/bash
 
+function p_invoke() {
+	perf record -F1000 --call-graph dwarf -o /perf.data \
+		-- /nginx/objs/nginx \
+			-p /tmp \
+			-e /tmp/error.log \
+			-c /nginx.conf \
+			-g "daemon off;"
+}
+
 function invoke() {
 	/nginx/objs/nginx    \
 		-p /tmp          \
@@ -23,7 +32,7 @@ function sigcont_handler() {
 trap 'sigint_handler' INT
 trap 'sigcont_handler' CONT
 
-invoke &
+p_invoke &
 wait
 echo "NGINX down. waiting until signalled..."
 sleep infinity