Implement a simple count based boot marker.

We write the number of failed boots to the marker and only
prune the dalvik cache if the number of consecutive failed
boots is higher than a predefined threshold.

Note that the code is forgiving of errors related to boot
markers; we continue the boot process even if we're unable
to create / write or flush the boot marker.

bug: 19360096
Change-Id: Ia17c3b783318ddf43c9199d0f7f09c54a4176667

1 files changed, 9 insertions, 0 deletions

diff --git a/runtime/runtime.h b/runtime/runtime.h
index 118c838397..e7d95fb595 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -516,6 +516,10 @@ class Runtime {
     return target_sdk_version_;
   }
 
+  uint32_t GetZygoteMaxFailedBoots() const {
+    return zygote_max_failed_boots_;
+  }
+
  private:
   static void InitPlatformSignalHandlers();
 
@@ -682,6 +686,11 @@ class Runtime {
   // that there's no native bridge.
   bool is_native_bridge_loaded_;
 
+  // The maximum number of failed boots we allow before pruning the dalvik cache
+  // and trying again. This option is only inspected when we're running as a
+  // zygote.
+  uint32_t zygote_max_failed_boots_;
+
   DISALLOW_COPY_AND_ASSIGN(Runtime);
 };
 std::ostream& operator<<(std::ostream& os, const Runtime::CalleeSaveType& rhs);