init: add timers around sync() during shutdown

It seems that these sync() calls may take a long time in some
occasions, so we add these logs to check.

Bug: 74817735
Test: tree hugger
Change-Id: Id3635f6c7a6618b20c7caf93b05e50cc50ef99de

1 files changed, 12 insertions, 2 deletions

diff --git a/init/reboot.cpp b/init/reboot.cpp
index 03ed55a1b..bb87f1292 100644
--- a/init/reboot.cpp
+++ b/init/reboot.cpp
@@ -429,10 +429,20 @@ void RebootThread(unsigned int cmd, std::chrono::milliseconds shutdown_timeout,
         if (kill_after_apps.count(s->name())) s->Stop();
     }
     // 4. sync, try umount, and optionally run fsck for user shutdown
-    sync();
+    {
+        Timer sync_timer;
+        LOG(INFO) << "sync() before umount...";
+        sync();
+        LOG(INFO) << "sync() before umount took" << sync_timer;
+    }
     UmountStat stat = TryUmountAndFsck(runFsck, shutdown_timeout - t.duration());
     // Follow what linux shutdown is doing: one more sync with little bit delay
-    sync();
+    {
+        Timer sync_timer;
+        LOG(INFO) << "sync() after umount...";
+        sync();
+        LOG(INFO) << "sync() after umount took" << sync_timer;
+    }
     if (cmd != ANDROID_RB_THERMOFF) std::this_thread::sleep_for(100ms);
     LogShutdownTime(stat, &t);