From 73ab6c2d13473be60fa8a53edf762095dcfd1681 Mon Sep 17 00:00:00 2001
From: Mohamad Gebai <mgebai@suse.com>
Date: Thu, 11 May 2017 09:16:31 -0400
Subject: [PATCH] tracing: add -finstrument-functions for OSD

Signed-off-by: Mohamad Gebai <mgebai@suse.com>
---
 src/ceph_osd.cc                     |  7 +++++++
 src/osd/CMakeLists.txt              | 11 ++++++++++
 src/tracing/cyg_profile_functions.c | 31 +++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+)
 create mode 100644 src/tracing/cyg_profile_functions.c

diff --git a/src/ceph_osd.cc b/src/ceph_osd.cc
index f4d28751a16..a4061079c63 100644
--- a/src/ceph_osd.cc
+++ b/src/ceph_osd.cc
@@ -56,6 +56,10 @@ TracepointProvider::Traits osd_tracepoint_traits("libosd_tp.so",
                                                  "osd_tracing");
 TracepointProvider::Traits os_tracepoint_traits("libos_tp.so",
                                                 "osd_objectstore_tracing");
+#ifdef WITH_OSD_INSTRUMENT_FUNCTIONS
+TracepointProvider::Traits cyg_profile_traits("libcyg_profile_tp.so",
+                                                 "osd_function_tracing");
+#endif
 
 } // anonymous namespace
 
@@ -582,6 +586,9 @@ flushjournal_out:
 
   TracepointProvider::initialize<osd_tracepoint_traits>(g_ceph_context);
   TracepointProvider::initialize<os_tracepoint_traits>(g_ceph_context);
+#ifdef WITH_OSD_INSTRUMENT_FUNCTIONS
+  TracepointProvider::initialize<cyg_profile_traits>(g_ceph_context);
+#endif
 
   MonClient mc(g_ceph_context);
   if (mc.build_initial_monmap() < 0)
diff --git a/src/osd/CMakeLists.txt b/src/osd/CMakeLists.txt
index ecc944b182b..4423039588d 100644
--- a/src/osd/CMakeLists.txt
+++ b/src/osd/CMakeLists.txt
@@ -2,6 +2,13 @@ set(osdc_osd_srcs
   ${CMAKE_SOURCE_DIR}/src/osdc/Objecter.cc
   ${CMAKE_SOURCE_DIR}/src/osdc/Striper.cc)
 
+if(WITH_OSD_INSTRUMENT_FUNCTIONS AND CMAKE_CXX_COMPILER_ID STREQUAL GNU)
+  set(GCC_C_FLAGS "-finstrument-functions")
+  set(GCC_C_FLAGS "${GCC_C_FLAGS} -finstrument-functions-exclude-function-list=_mm_loadu_si128,_mm_cmpeq_epi32,_mm_movemask_epi8")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GCC_C_FLAGS}")
+  set(osd_cyg_functions_src ${CMAKE_SOURCE_DIR}/src/tracing/cyg_profile_functions.c)
+endif()
+
 set(osd_srcs
   OSD.cc
   Watch.cc
@@ -23,6 +30,7 @@ set(osd_srcs
   ECUtil.cc
   ExtentCache.cc
   ${CMAKE_SOURCE_DIR}/src/common/TrackedOp.cc
+  ${osd_cyg_functions_src}
   ${osdc_osd_srcs})
 if(HAS_VTA)
   set_source_files_properties(osdcap.cc
@@ -41,3 +49,6 @@ endif()
 if(WITH_LTTNG AND WITH_EVENTTRACE)
   add_dependencies(osd eventtrace_tp)
 endif()
+if(WITH_OSD_INSTRUMENT_FUNCTIONS)
+  add_dependencies(osd cyg_profile_tp)
+endif()
diff --git a/src/tracing/cyg_profile_functions.c b/src/tracing/cyg_profile_functions.c
new file mode 100644
index 00000000000..d09c14c9d67
--- /dev/null
+++ b/src/tracing/cyg_profile_functions.c
@@ -0,0 +1,31 @@
+#include "acconfig.h"
+
+#ifdef WITH_LTTNG
+#define TRACEPOINT_DEFINE
+#define TRACEPOINT_PROBE_DYNAMIC_LINKAGE
+#include "tracing/cyg_profile.h"
+#undef TRACEPOINT_PROBE_DYNAMIC_LINKAGE
+#undef TRACEPOINT_DEFINE
+#endif
+
+void __cyg_profile_func_enter(void *this_fn, void *call_site)
+    __attribute__((no_instrument_function));
+
+void __cyg_profile_func_exit(void *this_fn, void *call_site)
+    __attribute__((no_instrument_function));
+
+
+void __cyg_profile_func_enter(void *this_fn, void *call_site)
+{
+#ifdef WITH_LTTNG
+    tracepoint(lttng_ust_cyg_profile, func_entry, this_fn, call_site);
+#endif
+}
+
+void __cyg_profile_func_exit(void *this_fn, void *call_site)
+{
+#ifdef WITH_LTTNG
+    tracepoint(lttng_ust_cyg_profile, func_exit, this_fn, call_site);
+#endif
+}
+
-- 
2.39.5