From 8d664fa0fdf05339e52e195709838dc7cc290eca Mon Sep 17 00:00:00 2001
From: T Jake Luciani <jake@apache.org>
Date: Tue, 6 Dec 2016 10:19:43 -0500
Subject: [PATCH] Include frame-pointer to improve epoll flamegraph tracing

Motivation:

When attempting to flamegraph netty w/ epoll it was noticed the stacks are lost going from
java to epoll lib.

Modifications:

added the -fno-omit-framepointer flag to compiler flags to ensure the fp is kept intact

Result:

Flamegraphs will now show native code in the same stack as java code using perf-java-flames
---
 transport-native-epoll/pom.xml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/transport-native-epoll/pom.xml b/transport-native-epoll/pom.xml
index c7d6eea6d8..927cb6c4f0 100644
--- a/transport-native-epoll/pom.xml
+++ b/transport-native-epoll/pom.xml
@@ -199,7 +199,7 @@
               <value>${linux.sendmmsg.support}${glibc.sendmmsg.support}</value>
               <!-- If glibc and linux kernel are both not sufficient...then define the CFLAGS -->
               <regex>.*IO_NETTY_SENDMSSG_NOT_FOUND.*</regex>
-              <replacement>CFLAGS=-O3 -DIO_NETTY_SENDMMSG_NOT_FOUND -Werror</replacement>
+              <replacement>CFLAGS=-O3 -DIO_NETTY_SENDMMSG_NOT_FOUND -Werror -fno-omit-frame-pointer</replacement>
               <failIfNoMatch>false</failIfNoMatch>
             </configuration>
           </execution>
@@ -215,7 +215,7 @@
               <value>${jni.compiler.args.cflags}</value>
               <!-- If glibc and linux kernel are both not sufficient...then define the CFLAGS -->
               <regex>^((?!CFLAGS=).)*$</regex>
-              <replacement>CFLAGS=-O3 -Werror</replacement>
+              <replacement>CFLAGS=-O3 -Werror -fno-omit-frame-pointer</replacement>
               <failIfNoMatch>false</failIfNoMatch>
             </configuration>
           </execution>