commit 5c4a58072fad88a2ab89cfe063dd217041491357
author Dimitry Ivanov <dimitry@google.com> Fri Mar 17 16:41:34 2017 -0700
committer Dimitry Ivanov <dimitry@google.com> Mon Mar 20 13:34:52 2017 -0700
tree 814a5452c3dfd0a60ef1f02102461305a9958761
parent 2a4a5e72f161699be75b247e6fcb3a9ac6d8a852

Add systrace output for dlopen calls

Bug: http://b/27195126
Test: manual: adb shell atrace -t 5 bionic
      and run bionic-unit-tests --gtest_filter=dl*:Dl*

Change-Id: Ib2bad794e571b89bd1f52c9e0de642c2092e5c21

linker/linker.cpp

diff --git a/linker/linker.cpp b/linker/linker.cpp
index 7b16cc3..a05cd3b 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -1861,6 +1861,9 @@
 void* do_dlopen(const char* name, int flags,
                 const android_dlextinfo* extinfo,
                 const void* caller_addr) {
+  std::string trace_prefix = std::string("dlopen: ") + (name == nullptr ? "(nullptr)" : name);
+  ScopedTrace trace(trace_prefix.c_str());
+  ScopedTrace loading_trace((trace_prefix + " - loading and linking").c_str());
   soinfo* const caller = find_containing_library(caller_addr);
   android_namespace_t* ns = get_caller_namespace(caller);
 
@@ -1937,6 +1940,8 @@
 
   ProtectedDataGuard guard;
   soinfo* si = find_library(ns, translated_name, flags, extinfo, caller);
+  loading_trace.End();
+
   if (si != nullptr) {
     void* handle = si->to_handle();
     LD_LOG(kLogDlopen,