dumpsys: report per-service dump times

In WiFi soak testing, we've seen several cases where
dumpsys times out. We've been unable to pin down the
cause of the timeouts, as there's no single service
that is obviously hung.

Add reporting of service dump times, to help figure
out why dumpsys is timing out.

BUG=29090949
TEST=manual

Manual test
- load build on bullhead
$ adb shell dumpsys | grep 'was the duration'
- see non-zero values

Change-Id: Iaba60d840ac55cba171a3ccbc74c2aee8b23dce6
(cherry picked from commit 4e4c548437b7cc7748e97ecc74a525e26a441cdb)

1 files changed, 12 insertions, 1 deletions

diff --git a/cmds/dumpsys/dumpsys.cpp b/cmds/dumpsys/dumpsys.cpp
index 7e5bbc578b..957a44912c 100644
--- a/cmds/dumpsys/dumpsys.cpp
+++ b/cmds/dumpsys/dumpsys.cpp
@@ -10,6 +10,7 @@
 #include <thread>
 
 #include <android-base/file.h>
+#include <android-base/stringprintf.h>
 #include <android-base/unique_fd.h>
 #include <binder/IServiceManager.h>
 #include <binder/Parcel.h>
@@ -30,6 +31,7 @@
 #include <unistd.h>
 
 using namespace android;
+using android::base::StringPrintf;
 using android::base::unique_fd;
 using android::base::WriteFully;
 
@@ -210,7 +212,8 @@ int main(int argc, char* const argv[])
             });
 
             auto timeout = std::chrono::seconds(timeoutArg);
-            auto end = std::chrono::steady_clock::now() + timeout;
+            auto start = std::chrono::steady_clock::now();
+            auto end = start + timeout;
 
             struct pollfd pfd = {
                 .fd = local_end.get(),
@@ -267,6 +270,14 @@ int main(int argc, char* const argv[])
             } else {
                 dump_thread.join();
             }
+
+            if (N > 1) {
+              std::chrono::duration<double> elapsed_seconds =
+                  std::chrono::steady_clock::now() - start;
+              aout << StringPrintf("------ %.3fs was the duration of '", elapsed_seconds.count()).
+                  c_str();
+              aout << service_name << "' ------" << endl;
+            }
         } else {
             aerr << "Can't find service: " << service_name << endl;
         }