SurfaceFlinger: Add support for continuous dumpsys to file.

- Collect dumpsys to an outfile file when triggered.
- Collect dumpsys before calling Prepare on hwc module in
  each draw cycle. Recollect dumpsys if Commit goes through
  successfully and replace former dumpsys with this.
- Wrap around if file size reaches appx 20 MB.
- Generate output file at /data/misc/display/dumpsys.txt
- Syntax:
      adb shell dumpsys SurfaceFlinger --file [--no-limit]
          --file : Ouput dumpsys to file
          --no-limit : Do not wrap around, keep appending

      Use same command to trigger start and end of dumping.
- Output format:
      | start code | after commit? | time stamp | dump size | dump data |

CRs-Fixed: 947084

Change-Id: Ie520f51c69757aeec88b9400688a7f3271472349

1 files changed, 14 insertions, 0 deletions

diff --git a/services/surfaceflinger/ExSurfaceFlinger/ExSurfaceFlinger.h b/services/surfaceflinger/ExSurfaceFlinger/ExSurfaceFlinger.h
index 628fac7..068f2b9 100644
--- a/services/surfaceflinger/ExSurfaceFlinger/ExSurfaceFlinger.h
+++ b/services/surfaceflinger/ExSurfaceFlinger/ExSurfaceFlinger.h
@@ -79,6 +79,20 @@ protected:
     bool mDebugLogs;
     bool isDebug() { return mDebugLogs; }
     bool mDisableExtAnimation;
+
+#ifdef DEBUG_CONT_DUMPSYS
+    virtual status_t dump(int fd, const Vector<String16>& args);
+    virtual void dumpDrawCycle(bool prePrepare );
+
+    struct {
+      Mutex lock;
+      const char *name = "/data/misc/display/dumpsys.txt";
+      bool running = false;
+      bool noLimit = false;
+      bool replaceAfterCommit = false;
+      long int position = 0;
+    } mFileDump;
+#endif
 };
 
 }; //namespace android