diff --git a/README.md b/README.md
index b6dc9d7..d6c9c7f 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,8 @@
     - [Record and report call graph](#record-and-report-call-graph)
     - [Visualize profiling data](#visualize-profiling-data)
     - [Annotate source code](#annotate-source-code)
+- [Answers to common issues](#answers-to-common-issues)
+    - [The correct way to pull perf.data on host](#the-correct-way-to-pull-perfdata-on-host)
 
 
 ## Simpleperf introduction
@@ -149,10 +151,10 @@
 use --help.
 
     # List all subcommands.
-    $simpleperf --help
+    $ simpleperf --help
 
     # Print help message for record subcommand.
-    $simpleperf record --help
+    $ simpleperf record --help
 
 
 #### Simpleperf list
@@ -161,7 +163,7 @@
 devices may support different events because of differences in hardware and
 kernel.
 
-    $simpleperf list
+    $ simpleperf list
     List of hw-cache events:
       branch-loads
       ...
@@ -184,7 +186,7 @@
 
     # Stat using default events (cpu-cycles,instructions,...), and monitor
     # process 7394 for 10 seconds.
-    $simpleperf stat -p 7394 --duration 10
+    $ simpleperf stat -p 7394 --duration 10
     Performance counter statistics:
 
      1,320,496,145  cpu-cycles         # 0.131736 GHz                     (100%)
@@ -200,10 +202,10 @@
 We can select which events to use via -e option. Below are examples:
 
     # Stat event cpu-cycles.
-    $simpleperf stat -e cpu-cycles -p 11904 --duration 10
+    $ simpleperf stat -e cpu-cycles -p 11904 --duration 10
 
     # Stat event cache-references and cache-misses.
-    $simpleperf stat -e cache-references,cache-misses -p 11904 --duration 10
+    $ simpleperf stat -e cache-references,cache-misses -p 11904 --duration 10
 
 When running the stat command, if the number of hardware events is larger than
 the number of hardware counters available in the PMU, the kernel shares hardware
@@ -212,7 +214,7 @@
 showing the percentage of the total time that each event was actually monitored.
 
     # Stat using event cache-references, cache-references:u,....
-    $simpleperf stat -p 7394 -e     cache-references,cache-references:u,cache-references:k,cache-misses,cache-misses:u,cache-misses:k,instructions --duration 1
+    $ simpleperf stat -p 7394 -e     cache-references,cache-references:u,cache-references:k,cache-misses,cache-misses:u,cache-misses:k,instructions --duration 1
     Performance counter statistics:
 
     4,331,018  cache-references     # 4.861 M/sec    (87%)
@@ -231,7 +233,7 @@
 --group option. Below is an example.
 
     # Stat using event cache-references, cache-references:u,....
-    $simpleperf stat -p 7394 --group cache-references,cache-misses --group cache-references:u,cache-misses:u --group cache-references:k,cache-misses:k -e instructions --duration 1
+    $ simpleperf stat -p 7394 --group cache-references,cache-misses --group cache-references:u,cache-misses:u --group cache-references:k,cache-misses:k -e instructions --duration 1
     Performance counter statistics:
 
     3,638,900  cache-references     # 4.786 M/sec          (74%)
@@ -251,13 +253,13 @@
 the child process. Below are examples.
 
     # Stat process 11904 and 11905.
-    $simpleperf stat -p 11904,11905 --duration 10
+    $ simpleperf stat -p 11904,11905 --duration 10
 
     # Stat thread 11904 and 11905.
-    $simpleperf stat -t 11904,11905 --duration 10
+    $ simpleperf stat -t 11904,11905 --duration 10
 
     # Start a child process running `ls`, and stat it.
-    $simpleperf stat ls
+    $ simpleperf stat ls
 
 **Decide how long to monitor**
 When monitoring existing threads, we can use --duration option to decide how long
@@ -266,13 +268,13 @@
 at any time. Below are examples.
 
     # Stat process 11904 for 10 seconds.
-    $simpleperf stat -p 11904 --duration 10
+    $ simpleperf stat -p 11904 --duration 10
 
     # Stat until the child process running `ls` finishes.
-    $simpleperf stat ls
+    $ simpleperf stat ls
 
     # Stop monitoring using Ctrl-C.
-    $simpleperf stat -p 11904 --duration 10
+    $ simpleperf stat -p 11904 --duration 10
     ^C
 
 **Decide the print interval**
@@ -280,20 +282,20 @@
 interval. Below are examples.
 
     # Print stat for process 11904 every 300ms.
-    $simpleperf stat -p 11904 --duration 10 --interval 300
+    $ simpleperf stat -p 11904 --duration 10 --interval 300
 
     # Print system wide stat at interval of 300ms for 10 seconds (rooted device only).
     # system wide profiling needs root privilege
-    $su 0 simpleperf stat -a --duration 10 --interval 300
+    $ su 0 simpleperf stat -a --duration 10 --interval 300
 
 **Display counters in systrace**
 simpleperf can also work with systrace to dump counters in the collected trace.
 Below is an example to do a system wide stat
 
     # capture instructions (kernel only) and cache misses with interval of 300 milliseconds for 15 seconds
-    $su 0 simpleperf stat -e instructions:k,cache-misses -a --interval 300 --duration 15
+    $ su 0 simpleperf stat -e instructions:k,cache-misses -a --interval 300 --duration 15
     # on host launch systrace to collect trace for 10 seconds
-    (HOST)$external/chromium-trace/systrace.py --time=10 -o new.html sched gfx view
+    (HOST)$ external/chromium-trace/systrace.py --time=10 -o new.html sched gfx view
     # open the collected new.html in browser and perf counters will be shown up
 
 
@@ -306,7 +308,7 @@
     # Record on process 7394 for 10 seconds, using default event (cpu-cycles),
     # using default sample frequency (4000 samples per second), writing records
     # to perf.data.
-    $simpleperf record -p 7394 --duration 10
+    $ simpleperf record -p 7394 --duration 10
     simpleperf I 07-11 21:44:11 17522 17522 cmd_record.cpp:316] Samples recorded: 21430. Samples lost: 0.
 
 **Select events**
@@ -315,20 +317,20 @@
 events via -e option. Below is an example.
 
     # Record using event instructions.
-    $simpleperf record -e instructions -p 11904 --duration 10
+    $ simpleperf record -e instructions -p 11904 --duration 10
 
 **Select target to monitor**
 The way to select target in record command is similar to that in stat command.
 Below are examples.
 
     # Record process 11904 and 11905.
-    $simpleperf record -p 11904,11905 --duration 10
+    $ simpleperf record -p 11904,11905 --duration 10
 
     # Record thread 11904 and 11905.
-    $simpleperf record -t 11904,11905 --duration 10
+    $ simpleperf record -t 11904,11905 --duration 10
 
     # Record a child process running `ls`.
-    $simpleperf record ls
+    $ simpleperf record ls
 
 **Set the frequency to record**
 We can set the frequency to dump records via the -f or -c options. For example,
@@ -339,23 +341,23 @@
 means dumping one record whenever 10000 events happen. Below are examples.
 
     # Record with sample frequency 1000: sample 1000 times every second running.
-    $simpleperf record -f 1000 -p 11904,11905 --duration 10
+    $ simpleperf record -f 1000 -p 11904,11905 --duration 10
 
     # Record with sample period 100000: sample 1 time every 100000 events.
-    $simpleperf record -c 100000 -t 11904,11905 --duration 10
+    $ simpleperf record -c 100000 -t 11904,11905 --duration 10
 
 **Decide how long to monitor**
 The way to decide how long to monitor in record command is similar to that in
 stat command. Below are examples.
 
     # Record process 11904 for 10 seconds.
-    $simpleperf record -p 11904 --duration 10
+    $ simpleperf record -p 11904 --duration 10
 
     # Record until the child process running `ls` finishes.
-    $simpleperf record ls
+    $ simpleperf record ls
 
     # Stop monitoring using Ctrl-C.
-    $simpleperf record -p 11904 --duration 10
+    $ simpleperf record -p 11904 --duration 10
     ^C
 
 **Set the path to store records**
@@ -363,7 +365,7 @@
 use -o option to set the path to store records. Below is an example.
 
     # Write records to data/perf2.data.
-    $simpleperf record -p 11904 -o data/perf2.data --duration 10
+    $ simpleperf record -p 11904 -o data/perf2.data --duration 10
 
 
 #### Simpleperf report
@@ -385,7 +387,7 @@
     # Reports perf.data, using only records sampled in libsudo-game-jni.so,
     # grouping records using thread name(comm), process id(pid), thread id(tid),
     # function name(symbol), and showing sample count for each row.
-    $simpleperf report --dsos /data/app/com.example.sudogame-2/lib/arm64/libsudo-game-jni.so --sort comm,pid,tid,symbol -n
+    $ simpleperf report --dsos /data/app/com.example.sudogame-2/lib/arm64/libsudo-game-jni.so --sort comm,pid,tid,symbol -n
     Cmdline: /data/data/com.example.sudogame/simpleperf record -p 7394 --duration 10
     Arch: arm64
     Event: cpu-cycles (type 0, config 0)
@@ -402,7 +404,7 @@
 By default, simpleperf reads perf.data in current directory. We can use -i
 option to select another file to read records.
 
-    $simpleperf report -i data/perf2.data
+    $ simpleperf report -i data/perf2.data
 
 **Set the path to find executable binaries**
 If reporting function symbols, simpleperf needs to read executable binaries
@@ -412,11 +414,11 @@
 symbol table and debug information. So we can use --symfs to redirect the paths.
 Below is an example.
 
-    $simpleperf report
+    $ simpleperf report
     # In this case, when simpleperf wants to read executable binary /A/b,
     # it reads file in /A/b.
 
-    $simpleperf report --symfs /debug_dir
+    $ simpleperf report --symfs /debug_dir
     # In this case, when simpleperf wants to read executable binary /A/b,
     # it prefers file in /debug_dir/A/b to file in /A/b.
 
@@ -425,19 +427,19 @@
 supports five filters to select records of interest. Below are examples.
 
     # Report records in threads having name sudogame.
-    $simpleperf report --comms sudogame
+    $ simpleperf report --comms sudogame
 
     # Report records in process 7394 or 7395
-    $simpleperf report --pids 7394,7395
+    $ simpleperf report --pids 7394,7395
 
     # Report records in thread 7394 or 7395.
-    $simpleperf report --tids 7394,7395
+    $ simpleperf report --tids 7394,7395
 
     # Report records in libsudo-game-jni.so.
-    $simpleperf report --dsos /data/app/com.example.sudogame-2/lib/arm64/libsudo-game-jni.so
+    $ simpleperf report --dsos /data/app/com.example.sudogame-2/lib/arm64/libsudo-game-jni.so
 
     # Report records in function checkValid or canFindSolution_r.
-    $simpleperf report --symbols "checkValid(Board const&, int, int);canFindSolution_r(Board&, int, int)"
+    $ simpleperf report --symbols "checkValid(Board const&, int, int);canFindSolution_r(Board&, int, int)"
 
 **Decide how to group records into sample entries**
 Simpleperf uses --sort option to decide how to group sample entries. Below are
@@ -445,26 +447,26 @@
 
     # Group records based on their process id: records having the same process
     # id are in the same sample entry.
-    $simpleperf report --sort pid
+    $ simpleperf report --sort pid
 
     # Group records based on their thread id and thread comm: records having
     # the same thread id and thread name are in the same sample entry.
-    $simpleperf report --sort tid,comm
+    $ simpleperf report --sort tid,comm
 
     # Group records based on their binary and function: records in the same
     # binary and function are in the same sample entry.
-    $simpleperf report --sort dso,symbol
+    $ simpleperf report --sort dso,symbol
 
     # Default option: --sort comm,pid,tid,dso,symbol. Group records in the same
     # thread, and belong to the same function in the same binary.
-    $simpleperf report
+    $ simpleperf report
 
 
 ## Android application profiling
 
 This section shows how to profile an Android application.
 [Here](https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/README.md) are examples. And we use
-[SimpleperfExamplePureJava]((https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava) project to show the profiling results.
+[SimpleperfExamplePureJava](https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava) project to show the profiling results.
 
 Simpleperf only supports profiling native instructions in binaries in ELF
 format. If the Java code is executed by interpreter, or with jit cache, it
@@ -501,32 +503,32 @@
 To profile Java code, we need the jvm running in oat mode. But on Android O,
 debuggable applications are forced to run in jit mode. To work around this,
 we need to add a `wrap.sh` in the apk. So if you are running on Android O device,
-Check [here]((https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava/app/profiling.gradle)
+Check [here](https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava/app/profiling.gradle)
 for how to add `wrap.sh` in the apk.
 
 **4. Make sure C++ code is compiled with optimizing flags.**
 If the application contains C++ code, it can be compiled with -O0 flag in debug build type.
-This makes C++ code slow. Check [here]((https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava/app/profiling.gradle)
+This makes C++ code slow. Check [here](https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava/app/profiling.gradle)
 for how to avoid that.
 
 **5. Use native libraries with debug info in the apk when possible.**
 If the application contains C++ code or pre-compiled native libraries, try to use
 unstripped libraries in the apk. This helps simpleperf generating better profiling
-results. Check [here]((https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava/app/profiling.gradle)
+results. Check [here](https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava/app/profiling.gradle)
 for how to use unstripped libraries.
 
-Here we use [SimpleperfExamplePureJava]((https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava) as an example.
+Here we use [SimpleperfExamplePureJava](https://android.googlesource.com/platform/system/extras/+/master/simpleperf/demo/SimpleperfExamplePureJava) as an example.
 It builds an app-profiling.apk for profiling.
 
-    $git clone https://android.googlesource.com/platform/system/extras
-    $cd extras/simpleperf/demo
+    $ git clone https://android.googlesource.com/platform/system/extras
+    $ cd extras/simpleperf/demo
     # Open SimpleperfExamplesPureJava project with Android studio,
     # and build this project sucessfully, otherwise the `./gradlew` command below will fail.
-    $cd SimpleperfExamplePureJava
+    $ cd SimpleperfExamplePureJava
 
     # On windows, use "gradlew" instead.
-    $./gradlew clean assemble
-    $adb install -r app/build/outputs/apk/app-profiling.apk
+    $ ./gradlew clean assemble
+    $ adb install -r app/build/outputs/apk/app-profiling.apk
 
 
 ### Record and report profiling data (using command-lines)
@@ -537,7 +539,7 @@
 
 **1. Enable profiling**
 
-    $adb shell setprop security.perf_harden 0
+    $ adb shell setprop security.perf_harden 0
 
 **2. Fully compile the app**
 
@@ -546,10 +548,10 @@
 
 On Android >= N:
 
-    $adb shell setprop debug.generate-debug-info true
-    $adb shell cmd package compile -f -m speed com.example.simpleperf.simpleperfexamplepurejava
+    $ adb shell setprop debug.generate-debug-info true
+    $ adb shell cmd package compile -f -m speed com.example.simpleperf.simpleperfexamplepurejava
     # Restart the app to take effect
-    $adb shell am force-stop com.example.simpleperf.simpleperfexamplepurejava
+    $ adb shell am force-stop com.example.simpleperf.simpleperfexamplepurejava
 
 On Android M devices, We need root privilege to force Android to fully compile
 Java code into native instructions in ELF binaries with debug information. We
@@ -557,29 +559,29 @@
 writes them to a directory whose uid/gid is system:install). So profiling Java
 code can only be done on rooted devices.
 
-    $adb root
-    $adb shell setprop dalvik.vm.dex2oat-flags -g
+    $ adb root
+    $ adb shell setprop dalvik.vm.dex2oat-flags -g
 
     # Reinstall the app.
-    $adb install -r app/build/outputs/apk/app-profiling.apk
+    $ adb install -r app/build/outputs/apk/app-profiling.apk
 
 On Android L devices, we also need root privilege to compile the app with debug info
 and access the native binaries.
 
-    $adb root
-    $adb shell setprop dalvik.vm.dex2oat-flags --include-debug-symbols
+    $ adb root
+    $ adb shell setprop dalvik.vm.dex2oat-flags --include-debug-symbols
 
     # Reinstall the app.
-    $adb install -r app/build/outputs/apk/app-profiling.apk
+    $ adb install -r app/build/outputs/apk/app-profiling.apk
 
 
 **3. Find the app process**
 
     # Start the app if needed
-    $adb shell am start -n com.example.simpleperf.simpleperfexamplepurejava/.MainActivity
+    $ adb shell am start -n com.example.simpleperf.simpleperfexamplepurejava/.MainActivity
 
     # Run `ps` in the app's context. On Android >= O devicces, run `ps -e` instead.
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ps | grep simpleperf
+    $ adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ps | grep simpleperf
     u0_a151   6885  3346  1590504 53980 SyS_epoll_ 6fc2024b6c S com.example.simpleperf.simpleperfexamplepurejava
 
 So the id of the app process is `6885`. We will use this number in the command lines below,
@@ -588,22 +590,22 @@
 **4. Download simpleperf to the app's data directory**
 
     # Find which architecture the app is using.
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava cat /proc/6885/maps | grep boot.oat
+    $ adb shell run-as com.example.simpleperf.simpleperfexamplepurejava cat /proc/6885/maps | grep boot.oat
     708e6000-70e33000 r--p 00000000 103:09 1214                              /system/framework/arm64/boot.oat
 
     # The app uses /arm64/boot.oat, so push simpleperf in bin/android/arm64/ to device.
-    $cd ../../scripts/
-    $adb push bin/android/arm64/simpleperf /data/local/tmp
-    $adb shell chmod a+x /data/local/tmp/simpleperf
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava cp /data/local/tmp/simpleperf .
+    $ cd ../../scripts/
+    $ adb push bin/android/arm64/simpleperf /data/local/tmp
+    $ adb shell chmod a+x /data/local/tmp/simpleperf
+    $ adb shell run-as com.example.simpleperf.simpleperfexamplepurejava cp /data/local/tmp/simpleperf .
 
 
 **5. Record perf.data**
 
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ./simpleperf record -p 6885 --duration 10 --dump-symbols
+    $ adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ./simpleperf record -p 6885 --duration 10
     simpleperf I 04-27 20:41:11  6940  6940 cmd_record.cpp:357] Samples recorded: 40008. Samples lost: 0.
 
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ls -lh perf.data
+    $ adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ls -lh perf.data
     simpleperf I 04-27 20:31:40  5999  5999 cmd_record.cpp:357] Samples recorded: 39949. Samples lost: 0.
 
 The profiling data is recorded at perf.data.
@@ -617,16 +619,18 @@
 **6. Report perf.data**
 
     # Pull perf.data on host.
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava cat perf.data >perf.data
+    $ adb shell "run-as com.example.simpleperf.simpleperfexamplepurejava cat perf.data | tee /data/local/tmp/perf.data >/dev/null"
+    $ adb pull /data/local/tmp/perf.data
 
     # Report samples using corresponding simpleperf executable on host.
     # On windows, use "bin\windows\x86_64\simpleperf" instead.
-    $bin/linux/x86_64/simpleperf report
+    $ bin/linux/x86_64/simpleperf report
     ...
     Overhead  Command   Pid   Tid   Shared Object                                                                     Symbol
     83.54%    Thread-2  6885  6900  /data/app/com.example.simpleperf.simpleperfexamplepurejava-2/oat/arm64/base.odex  void com.example.simpleperf.simpleperfexamplepurejava.MainActivity$1.run()
     16.11%    Thread-2  6885  6900  /data/app/com.example.simpleperf.simpleperfexamplepurejava-2/oat/arm64/base.odex  int com.example.simpleperf.simpleperfexamplepurejava.MainActivity$1.callFunction(int)
 
+See [here](#the-correct-way-to-pull-perfdata-on-host) for why we use tee rather than just >.
 There are many ways to show reports, check [report command](#simpleperf-report) for details.
 
 
@@ -641,7 +645,7 @@
     Change `app_package_name` line to  app_package_name="com.example.simpleperf.simpleperfexamplepurejava"
     Change `apk_file_path` line to apk_file_path = "../SimpleperfExamplePureJava/app/build/outputs/apk/app-profiling.apk"
     Change `android_studio_project_dir` line to android_studio_project_dir = "../SimpleperfExamplePureJava/"
-    Change `record_options` line to record_options = "--dump-symbols --duration 10"
+    Change `record_options` line to record_options = "--duration 10"
 
 `apk_file_path` is needed to fully compile the application on Android L/M. It is
 not necessary on Android >= N.
@@ -653,7 +657,7 @@
 
 **2. Run `app-profiler.py`**
 
-    $python app_profiler.py
+    $ python app_profiler.py
 
 
 If running successfully, it will collect profiling data in perf.data in current
@@ -663,7 +667,7 @@
 
 We can use `report.py` to report perf.data.
 
-    $python report.py
+    $ python report.py
 
 We can add any option accepted by `simpleperf report` command to `report.py`.
 
@@ -693,11 +697,11 @@
 
 When using command lines, add `-g` option like below:
 
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ./simpleperf record -g -p 6685 --duration 10 --dump-symbols
+    $ adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ./simpleperf record -g -p 6685 --duration 10
 
 When using python scripts, change `app-profiler.config` as below:
 
-    Change `record_options` line to record_options = "--dump-symbols --duration 10 -g"
+    Change `record_options` line to record_options = "--duration 10 -g"
 
 Recording dwarf based call graph needs support of debug information
 in native binaries. So if using native libraries in the application,
@@ -708,11 +712,11 @@
 
 When using command lines, add `--call-graph fp` option like below:
 
-    $adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ./simpleperf record --call-graph fp -p 6685 --duration 10 --dump-symbols
+    $ adb shell run-as com.example.simpleperf.simpleperfexamplepurejava ./simpleperf record --call-graph fp -p 6685 --duration 10
 
 When using python scripts, change `app-profiler.config` as below:
 
-    Change `record_options` line to record_options = "--dump-symbols --duration 10 --call-graph fp"
+    Change `record_options` line to record_options = "--duration 10 --call-graph fp"
 
 Recording stack frame based call graphs needs support of stack frame
 register. Notice that on arm architecture, the stack frame register
@@ -724,9 +728,9 @@
 
 #### Report call graph
 
-To report call graph using command lines, add `-g --brief-callgraph` option.
+To report call graph using command lines, add `-g` option.
 
-    $bin/linux/x86_64/simpleperf report -g --brief-callgraph
+    $ bin/linux/x86_64/simpleperf report -g
     ...
     Children  Self    Command          Pid    Tid    Shared Object                                                                     Symbol
     99.97%    0.00%   Thread-2         10859  10876  /system/framework/arm64/boot.oat                                                  java.lang.Thread.run
@@ -741,7 +745,7 @@
 
 To report call graph using python scripts, add `-g` option.
 
-    $python report.py -g
+    $ python report.py -g
     # Double-click an item started with '+' to show its callgraph.
 
 ### Visualize profiling data
@@ -753,9 +757,9 @@
 
 ### Show flamegraph
 
-    $python report_sample.py >out.perf
-    $stackcollapse-perf.pl out.perf >out.folded
-    $./flamegraph.pl out.folded >a.svg
+    $ python report_sample.py >out.perf
+    $ stackcollapse-perf.pl out.perf >out.folded
+    $ ./flamegraph.pl out.folded >a.svg
 
 
 ### Visualize using pprof
@@ -764,8 +768,8 @@
 be got from https://github.com/google/pprof. pprof_proto_generator.py can
 generate profiling data in a format acceptable by pprof.
 
-    $python pprof_proto_generator.py
-    $pprof -pdf pprof.profile
+    $ python pprof_proto_generator.py
+    $ pprof -pdf pprof.profile
 
 
 ### Annotate source code
@@ -786,7 +790,7 @@
 
 **2. Run `annotate.py`**
 
-    $python annotate.py
+    $ python annotate.py
 
 
 **3. Read annotated code**
@@ -808,3 +812,15 @@
     // p field means how much time is spent just in current line.
     /* acc_p: 99.966552%, p: 83.628188%        */                    i = callFunction(i);
 
+
+## Answers to common issues
+
+### The correct way to pull perf.data on host
+As perf.data is generated in app's context, it can't be pulled directly to host.
+One way is to `adb shell run-as xxx cat perf.data >perf.data`. However, it
+doesn't work well on Windows, because the content can be modified when it goes
+through the pipe. So we first copy it from app's context to shell's context,
+then pull it on host. The commands are as below:
+
+    $adb shell "run-as xxx cat perf.data | tee /data/local/tmp/perf.data >/dev/null"
+    $adb pull /data/local/tmp/perf.data
diff --git a/annotate.py b/annotate.py
index d88a916..2b253bd 100644
--- a/annotate.py
+++ b/annotate.py
@@ -65,7 +65,7 @@
         dso = self.dso_dict.get(dso_name)
         if dso is None:
             self.dso_dict[dso_name] = dso = dict()
-        if not dso.has_key(addr):
+        if addr not in dso:
             dso[addr] = None
 
 
@@ -95,7 +95,8 @@
         addr_str = '\n'.join(addr_str)
         subproc = subprocess.Popen([self.addr2line_path, '-e', dso_path, '-aifC'],
                                    stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-        (stdoutdata, _) = subproc.communicate(addr_str)
+        (stdoutdata, _) = subproc.communicate(str_to_bytes(addr_str))
+        stdoutdata = bytes_to_str(stdoutdata)
         stdoutdata = stdoutdata.strip().split('\n')
         if len(stdoutdata) < len(addrs):
             log_fatal("addr2line didn't output enough lines")
@@ -270,7 +271,7 @@
                         'annotate_dest_dir', 'comm_filters', 'pid_filters',
                         'tid_filters', 'dso_filters', 'addr2line_path']
         for name in config_names:
-            if not config.has_key(name):
+            if name not in config:
                 log_fatal('config [%s] is missing' % name)
         symfs_dir = config['symfs_dir']
         if symfs_dir and not os.path.isdir(symfs_dir):
@@ -435,7 +436,7 @@
 
 
     def _add_dso_period(self, dso_name, period, used_dso_dict):
-        if not used_dso_dict.has_key(dso_name):
+        if dso_name not in used_dso_dict:
             used_dso_dict[dso_name] = True
             dso_period = self.dso_periods.get(dso_name)
             if dso_period is None:
@@ -444,7 +445,7 @@
 
 
     def _add_file_period(self, source, period, used_file_dict):
-        if not used_file_dict.has_key(source.file_key):
+        if source.file_key not in used_file_dict:
             used_file_dict[source.file_key] = True
             file_period = self.file_periods.get(source.file)
             if file_period is None:
@@ -453,14 +454,14 @@
 
 
     def _add_line_period(self, source, period, used_line_dict):
-        if not used_line_dict.has_key(source.line_key):
+        if source.line_key not in used_line_dict:
             used_line_dict[source.line_key] = True
             file_period = self.file_periods[source.file]
             file_period.add_line_period(source.line, period)
 
 
     def _add_function_period(self, source, period, used_function_dict):
-        if not used_function_dict.has_key(source.function_key):
+        if source.function_key not in used_function_dict:
             used_function_dict[source.function_key] = True
             file_period = self.file_periods[source.file]
             file_period.add_function_period(source.function, source.line, period)
@@ -471,14 +472,14 @@
         with open(summary, 'w') as f:
             f.write('total period: %d\n\n' % self.period)
             dso_periods = sorted(self.dso_periods.values(),
-                                 cmp=lambda x, y: cmp(y.period.acc_period, x.period.acc_period))
+                                 key=lambda x: x.period.acc_period, reverse=True)
             for dso_period in dso_periods:
                 f.write('dso %s: %s\n' % (dso_period.dso_name,
                                           self._get_percentage_str(dso_period.period)))
             f.write('\n')
 
             file_periods = sorted(self.file_periods.values(),
-                                  cmp=lambda x, y: cmp(y.period.acc_period, x.period.acc_period))
+                                  key=lambda x: x.period.acc_period, reverse=True)
             for file_period in file_periods:
                 f.write('file %s: %s\n' % (file_period.file,
                                            self._get_percentage_str(file_period.period)))
@@ -489,8 +490,7 @@
                 for func_name in file_period.function_dict.keys():
                     func_start_line, period = file_period.function_dict[func_name]
                     values.append((func_name, func_start_line, period))
-                values = sorted(values,
-                                cmp=lambda x, y: cmp(y[2].acc_period, x[2].acc_period))
+                values = sorted(values, key=lambda x: x[2].acc_period, reverse=True)
                 for value in values:
                     f.write('\tfunction (%s): line %d, %s\n' % (
                         value[0], value[1], self._get_percentage_str(value[2])))
@@ -515,7 +515,7 @@
 
     def _collect_source_files(self):
         self.source_file_dict = dict()
-        source_file_suffix = ['h', 'c', 'cpp', 'cc', 'java']
+        source_file_suffix = ['h', 'c', 'cpp', 'cc', 'java', 'kt']
         for source_dir in self.config['source_dirs']:
             for root, _, files in os.walk(source_dir):
                 for file in files:
@@ -633,4 +633,4 @@
     config = load_config(args.config)
     annotator = SourceFileAnnotator(config)
     annotator.annotate()
-    log_info('annotate finish successfully, please check result in annotated_files/.')
\ No newline at end of file
+    log_info('annotate finish successfully, please check result in annotated_files/.')
diff --git a/app_profiler.config b/app_profiler.config
index 4b61edb..752b85f 100644
--- a/app_profiler.config
+++ b/app_profiler.config
@@ -49,8 +49,8 @@
 
 
 # Profiling record options that will be passed directly to `simpleperf record` command on device.
-# As we can't stop profiling by Ctrl-C, we need to set how long to profile using "--duration".
-record_options = "-e cpu-cycles:u -f 4000 -g --dump-symbols --duration 10"
+# You can set how long to profile using "--duration" option, or use Ctrl-C to stop profiling.
+record_options = "-e cpu-cycles:u -f 4000 -g --duration 10"
 
 
 # The path to store generated perf.data on host.
diff --git a/app_profiler.py b/app_profiler.py
index 6c889b4..e2a137f 100644
--- a/app_profiler.py
+++ b/app_profiler.py
@@ -49,7 +49,7 @@
                         'record_options', 'perf_data_path', 'adb_path', 'readelf_path',
                         'binary_cache_dir']
         for name in config_names:
-            if not config.has_key(name):
+            if name not in config:
                 log_fatal('config [%s] is missing' % name)
         native_lib_dir = config.get('native_lib_dir')
         if native_lib_dir and not os.path.isdir(native_lib_dir):
@@ -121,7 +121,7 @@
         self.adb.set_property('security.perf_harden', '0')
         if self.is_root_device:
             # We can enable kernel symbols
-            self.adb.run(['shell', 'echo', '0', '>/proc/sys/kernel/kptr_restrict'])
+            self.adb.run(['shell', 'echo 0 >/proc/sys/kernel/kptr_restrict'])
 
 
     def _recompile_app(self):
@@ -265,16 +265,41 @@
 
 
     def start_and_wait_profiling(self):
-        self.run_in_app_dir([
-            './simpleperf', 'record', self.config['record_options'], '-p',
-            str(self.app_pid), '--symfs', '.'])
+        subproc = None
+        returncode = None
+        try:
+            args = self.get_run_in_app_dir_args([
+                './simpleperf', 'record', self.config['record_options'], '-p',
+                str(self.app_pid), '--symfs', '.'])
+            adb_args = [self.adb.adb_path] + args
+            log_debug('run adb cmd: %s' % adb_args)
+            subproc = subprocess.Popen(adb_args)
+            returncode = subproc.wait()
+        except KeyboardInterrupt:
+            if subproc:
+                self.stop_profiling()
+                returncode = 0
+        log_debug('run adb cmd: %s [result %s]' % (adb_args, returncode == 0))
+
+
+    def stop_profiling(self):
+        """ Stop profiling by sending SIGINT to simpleperf, and wait until it exits
+            to make sure perf.data is completely generated."""
+        has_killed = False
+        while True:
+            (result, _) = self.run_in_app_dir(['pidof', 'simpleperf'], check_result=False)
+            if not result:
+                break
+            if not has_killed:
+                has_killed = True
+                self.run_in_app_dir(['pkill', '-l', '2', 'simpleperf'], check_result=False)
+            time.sleep(1)
 
 
     def collect_profiling_data(self):
-        self.run_in_app_dir(['chmod', 'a+rw', 'perf.data'])
-        self.adb.check_run(['shell', 'cp',
-            '/data/data/%s/perf.data' % self.config['app_package_name'], '/data/local/tmp'])
-        self.adb.check_run(['pull', '/data/local/tmp/perf.data', self.config['perf_data_path']])
+        self.run_in_app_dir(['cat perf.data | tee /data/local/tmp/perf.data >/dev/null'])
+        self.adb.check_run_and_return_output(['pull', '/data/local/tmp/perf.data',
+                                              self.config['perf_data_path']])
         config = copy.copy(self.config)
         config['symfs_dirs'] = []
         if self.config['native_lib_dir']:
@@ -283,13 +308,20 @@
         binary_cache_builder.build_binary_cache()
 
 
-    def run_in_app_dir(self, args):
-        if self.is_root_device:
-            cmd = 'cd /data/data/' + self.config['app_package_name'] + ' && ' + (' '.join(args))
-            return self.adb.check_run_and_return_output(['shell', cmd])
+    def run_in_app_dir(self, args, stdout_file=None, check_result=True):
+        args = self.get_run_in_app_dir_args(args)
+        if check_result:
+            return self.adb.check_run_and_return_output(args, stdout_file)
         else:
-            return self.adb.check_run_and_return_output(
-                ['shell', 'run-as', self.config['app_package_name']] + args)
+            return self.adb.run_and_return_output(args, stdout_file)
+
+
+    def get_run_in_app_dir_args(self, args):
+        if self.is_root_device:
+            return ['shell', 'cd /data/data/' + self.config['app_package_name'] + ' && ' +
+                      (' '.join(args))]
+        else:
+            return ['shell', 'run-as', self.config['app_package_name']] + args
 
 
 if __name__ == '__main__':
diff --git a/bin/android/arm/simpleperf b/bin/android/arm/simpleperf
index 4bb1ef9..77d636a 100755
--- a/bin/android/arm/simpleperf
+++ b/bin/android/arm/simpleperf
Binary files differ
diff --git a/bin/android/arm64/simpleperf b/bin/android/arm64/simpleperf
index 365a943..e16dba7 100755
--- a/bin/android/arm64/simpleperf
+++ b/bin/android/arm64/simpleperf
Binary files differ
diff --git a/bin/android/x86/simpleperf b/bin/android/x86/simpleperf
index 6d77115..580e605 100755
--- a/bin/android/x86/simpleperf
+++ b/bin/android/x86/simpleperf
Binary files differ
diff --git a/bin/android/x86_64/simpleperf b/bin/android/x86_64/simpleperf
index c31dc40..07bf5fe 100755
--- a/bin/android/x86_64/simpleperf
+++ b/bin/android/x86_64/simpleperf
Binary files differ
diff --git a/bin/darwin/x86/libsimpleperf_report.dylib b/bin/darwin/x86/libsimpleperf_report.dylib
index cccfd9c..b60acab 100755
--- a/bin/darwin/x86/libsimpleperf_report.dylib
+++ b/bin/darwin/x86/libsimpleperf_report.dylib
Binary files differ
diff --git a/bin/darwin/x86/simpleperf b/bin/darwin/x86/simpleperf
index a73138b..e505397 100755
--- a/bin/darwin/x86/simpleperf
+++ b/bin/darwin/x86/simpleperf
Binary files differ
diff --git a/bin/darwin/x86_64/libsimpleperf_report.dylib b/bin/darwin/x86_64/libsimpleperf_report.dylib
index a734c87..f260a92 100755
--- a/bin/darwin/x86_64/libsimpleperf_report.dylib
+++ b/bin/darwin/x86_64/libsimpleperf_report.dylib
Binary files differ
diff --git a/bin/darwin/x86_64/simpleperf b/bin/darwin/x86_64/simpleperf
index 3ca9e1a..fbb43de 100755
--- a/bin/darwin/x86_64/simpleperf
+++ b/bin/darwin/x86_64/simpleperf
Binary files differ
diff --git a/bin/linux/x86/libsimpleperf_report.so b/bin/linux/x86/libsimpleperf_report.so
index d79ed74..54e93b8 100755
--- a/bin/linux/x86/libsimpleperf_report.so
+++ b/bin/linux/x86/libsimpleperf_report.so
Binary files differ
diff --git a/bin/linux/x86/simpleperf b/bin/linux/x86/simpleperf
index 7459a3e..1621233 100755
--- a/bin/linux/x86/simpleperf
+++ b/bin/linux/x86/simpleperf
Binary files differ
diff --git a/bin/linux/x86_64/libsimpleperf_report.so b/bin/linux/x86_64/libsimpleperf_report.so
index 5f5671b..74968a4 100755
--- a/bin/linux/x86_64/libsimpleperf_report.so
+++ b/bin/linux/x86_64/libsimpleperf_report.so
Binary files differ
diff --git a/bin/linux/x86_64/simpleperf b/bin/linux/x86_64/simpleperf
index 186cf1a..3c5f0be 100755
--- a/bin/linux/x86_64/simpleperf
+++ b/bin/linux/x86_64/simpleperf
Binary files differ
diff --git a/bin/windows/x86/libsimpleperf_report.dll b/bin/windows/x86/libsimpleperf_report.dll
index 1f985ed..6803307 100755
--- a/bin/windows/x86/libsimpleperf_report.dll
+++ b/bin/windows/x86/libsimpleperf_report.dll
Binary files differ
diff --git a/bin/windows/x86/simpleperf.exe b/bin/windows/x86/simpleperf.exe
index 46822bd..bcab5c1 100755
--- a/bin/windows/x86/simpleperf.exe
+++ b/bin/windows/x86/simpleperf.exe
Binary files differ
diff --git a/bin/windows/x86_64/libsimpleperf_report.dll b/bin/windows/x86_64/libsimpleperf_report.dll
index e774593..a3d59bb 100755
--- a/bin/windows/x86_64/libsimpleperf_report.dll
+++ b/bin/windows/x86_64/libsimpleperf_report.dll
Binary files differ
diff --git a/bin/windows/x86_64/simpleperf.exe b/bin/windows/x86_64/simpleperf.exe
index 46822bd..bcab5c1 100755
--- a/bin/windows/x86_64/simpleperf.exe
+++ b/bin/windows/x86_64/simpleperf.exe
Binary files differ
diff --git a/binary_cache_builder.py b/binary_cache_builder.py
index aa0e6e6..950e2fb 100644
--- a/binary_cache_builder.py
+++ b/binary_cache_builder.py
@@ -39,7 +39,7 @@
         config_names = ['perf_data_path', 'symfs_dirs', 'adb_path',
                         'readelf_path', 'binary_cache_dir']
         for name in config_names:
-            if not config.has_key(name):
+            if name not in config:
                 log_fatal('config for "%s" is missing' % name)
 
         self.perf_data_path = config.get('perf_data_path')
@@ -82,7 +82,7 @@
 
             for symbol in symbols:
                 dso_name = symbol.dso_name
-                if not binaries.has_key(dso_name):
+                if dso_name not in binaries:
                     binaries[dso_name] = lib.GetBuildIdForPath(dso_name)
         self.binaries = binaries
 
@@ -182,6 +182,7 @@
         if not self.readelf_path:
             return ""
         output = subprocess.check_output([self.readelf_path, '-n', file])
+        output = bytes_to_str(output)
         result = re.search(r'Build ID:\s*(\S+)', output)
         if result:
             build_id = result.group(1)
@@ -197,6 +198,7 @@
         if not self.readelf_path:
             return False
         output = subprocess.check_output([self.readelf_path, '-S', file])
+        output = bytes_to_str(output)
         if output.find('.symtab') != -1:
             return True
         return False
diff --git a/pprof_proto_generator.py b/pprof_proto_generator.py
index c877a16..fa2fdb1 100644
--- a/pprof_proto_generator.py
+++ b/pprof_proto_generator.py
@@ -31,7 +31,6 @@
 import profile_pb2
 import re
 import shutil
-import subprocess
 import sys
 import time
 
@@ -257,7 +256,10 @@
         self.lib = ReportLib()
 
         if config.get('binary_cache_dir'):
-            self.lib.SetSymfs(config['binary_cache_dir'])
+            if not os.path.isdir(config.get('binary_cache_dir')):
+                config['binary_cache_dir'] = ''
+            else:
+                self.lib.SetSymfs(config['binary_cache_dir'])
         if config.get('record_file'):
             self.lib.SetRecordFile(config['record_file'])
         if config.get('kallsyms'):
@@ -316,7 +318,8 @@
                 self.add_sample(sample)
 
         # 2. Generate line info for locations and functions.
-        self.gen_source_lines()
+        if self.config.get('binary_cache_dir'):
+            self.gen_source_lines()
 
         # 3. Produce samples/locations/functions in profile
         for sample in self.sample_list:
@@ -511,8 +514,12 @@
         profile_mapping.build_id = mapping.build_id_id
         profile_mapping.has_filenames = True
         profile_mapping.has_functions = True
-        profile_mapping.has_line_numbers = True
-        profile_mapping.has_inline_frames = True
+        if self.config.get('binary_cache_dir'):
+            profile_mapping.has_line_numbers = True
+            profile_mapping.has_inline_frames = True
+        else:
+            profile_mapping.has_line_numbers = False
+            profile_mapping.has_inline_frames = False
 
     def gen_profile_location(self, location):
         profile_location = self.profile.location.add()
diff --git a/repo.prop b/repo.prop
index f257fb4..5004eed 100644
--- a/repo.prop
+++ b/repo.prop
@@ -4,7 +4,7 @@
 device/generic/arm64 23d9a6b57c63fbea914ae663a0be693b43d91ffc
 device/generic/armv7-a-neon dd168c481dcb14c7932c7026ac7c8b4af128e4a5
 device/generic/common 11c092a6cbfcf6207f07a9a8e3398e747e7f5461
-device/generic/goldfish e87326d436005cfcff7b597ecf5cda21f8cd7b0e
+device/generic/goldfish eb66ec9609a6c6422cfec97074eaefe9b3b436cd
 device/generic/goldfish-opengl b0a0e2f0297a1b379dd460dbb74153773196238c
 device/generic/mini-emulator-arm64 6f2e6974a1b1dc0ef936aec732e33d553c000b5e
 device/generic/mini-emulator-armv7-a-neon 9d7cbb60819a1da8408a7148b965b4cd1ebbb570
@@ -15,146 +15,145 @@
 device/generic/mips 23901a9cf7a62f5f8f9f0c1382b5707694a1661c
 device/generic/mips64 03b4192ab5125e5d67636dc4c7121f089799e1fb
 device/generic/qemu 99feb6138f39e392495057ef7f2c4a5ed27f9e2d
+device/generic/uml c2e8fa7d294d2b83bbe6054dd7b94139517e8637
 device/generic/x86 dac918b4cd4a34342526588502e4b5a531183080
 device/generic/x86_64 f00aa59b3af4937ed014701755e9b01c95122187
 device/google/accessory/arduino abc5159a3ca9dbb5c7e364a1eab99901a4440ac5
 device/google/accessory/demokit 7dfe7f89a3b174709c773fe319531006e46440d9
 device/google/atv fbc45fb7c00d9b0150acdb674c9525ab32abe349
-device/google/contexthub b0a8cc4ed7a173314898fb75a286f3179b1a69e1
-device/google/dragon b02923940ab980bd361777629a04fde338e84766
+device/google/contexthub fd765cf358dba4be60b62ee068d6d0cc41674319
+device/google/dragon 0c29277c7842d8fe7b6ba49b2af35196030f093b
 device/google/dragon-kernel 8c9e4d14540119e0815a453eb4fefbedeaf8794f
-device/google/marlin 8ba659488f2010e135222049cf237839962f482c
+device/google/marlin c97ff13f9686384cf3089f70c83044bd2c7b5124
 device/google/marlin-kernel 48bde4626f5da9605b068b6c1bcc1e854a876d52
-device/htc/flounder 949fd9533a62ecc88c2ed30df2244147387e3a1a
-device/htc/flounder-kernel 1edc369683182e3353e1b802272d2406ef4f40fe
-device/huawei/angler 81f327d5a743a8f149e4e44cf1a1ea773cb54e92
+device/huawei/angler 602d56d59460ce359dccaa418687bbe95a0619bb
 device/huawei/angler-kernel db808069857bd03e573ce3c765dd6df43f2a4318
-device/lge/bullhead 7f78fc7bcd1e2349e3384e4c498a5fd00fb75804
+device/lge/bullhead 45cfd5d7594c92ff992e35f80c115b3db06f5d8a
 device/lge/bullhead-kernel 3f270065c17302930cc9319d399297436b65b3bc
-device/linaro/bootloader/OpenPlatformPkg a3d50249601e68f7d3c885d4259725c54130a213
+device/linaro/bootloader/OpenPlatformPkg 71183d6eabb1f91198f1bd3705a85b419cfd4685
 device/linaro/bootloader/arm-trusted-firmware 36aa82dda56169333aba6b2c55341404c1d631f0
-device/linaro/bootloader/edk2 09fc3d39493c50b938317477cc7095cee853eb33
-device/linaro/hikey 9e18cca0b575ad8ca3e6a158cab4795b345c0960
-device/linaro/hikey-kernel b70608ac73211ffa2c381168758dda457f2bc453
-device/moto/shamu df9354d7a28a67ac335a8f608d20bde6f0a97254
-device/moto/shamu-kernel 9ee09a9a4c803663cb0eb415d8ae1d57ba367cfb
-device/sample 7e5328e4f8a49db4424bd8c1ab7a203597b9010f
-kernel/tests 004476f0b91f314aaee4ef3e016f99492b80948a
-platform/art b9c3a99096c746b09af611e55e11b86600374011
-platform/bionic 1f9e64887882b532bdd12b6fbfa80817c2b67714
-platform/bootable/recovery f347c1abcac3bb1684d1ae329e3c229e7bf0b5b7
-platform/build a65a41dcdbdeb3a93e10993d47be94c249ef3ee8
-platform/build/blueprint e36ad10ea36302ade99b23e4ea1f4fed308a5116
-platform/build/kati 4124b98e2ff330b87ba8ba878a8affbde898df82
-platform/build/soong 528d5e5d2884309394a8518260682b4b41884051
-platform/compatibility/cdd 068a1efdb6a01e051cd5ca581b3fd70cf1382de5
-platform/cts 8617c799b02daa6dd0fa142ad097a3670e013cc6
-platform/dalvik 9fa280c2171b3a016d63e80cda7be031519b7ef7
+device/linaro/bootloader/edk2 02a0d1e313dc6e4d9e136f651c107f0533f34324
+device/linaro/hikey 14fc8793687878c840f48f6c6c7a4d00aa628c16
+device/linaro/hikey-kernel 60b637267e3d3b5140590649651c7033375aafb7
+device/sample 15f7857fc7b7f7cfd99ec4f93b151dc02a71b837
+kernel/tests 5c1b6c8a855bccc16bb27919d74e8b28102a5a4e
+platform/art fe9a4f061841a3c597aac6817a47c799c54fcad7
+platform/bionic fa21a8040747da164832a5e948087a455432a3b7
+platform/bootable/recovery f722fcf0d4b431aed3f415d5b86b94747313fdf5
+platform/build 9ea6a8b817928462492c4f7e1f16f6ff3a314a03
+platform/build/blueprint 8d20586d568d04037c258a25a5350676276351ab
+platform/build/kati bcb31defde3e3fc248a1f11049e7722233003b6f
+platform/build/soong 397866653ea737d8eef02d04827404f8a3eeeb19
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 platform/external/markdown 06a8f8b914d477183f68b84424bce8ff4dae7e84
 platform/external/mdnsresponder e8c578035302f59c4e09f7170e18302261bc9e63
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+platform/external/mesa3d e855ba79dee7a2d4df11d72752e1079cd5e58f2e
 platform/external/messageformat 9e1e4dddc8aa0cae8279281488f8a6bf4f453192
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 platform/external/mmc-utils 6de31b2b8a09108f9b91bc12bee2b792f783dc62
 platform/external/mockftpserver 777eb7d351810721b2416c4e48fe08e4ce0476f7
-platform/external/mockito 29162737382020f4096449a6f30e220878bfffca
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 platform/external/mockwebserver d680f43b995aae01123ee6bc7adb690dafcc47fe
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 platform/external/mp4parser 88bd0c6cfa7fcfbbebcc15c2c565f714cb36b065
@@ -245,87 +244,91 @@
 platform/external/nist-sip 8445067c3b53e5bd56c32f1c4fb688083c4f4005
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 platform/external/okhttp b53397b37a05fd50529810c726e7214cdc5b191e
 platform/external/opencv 6acb1f4a6e68f80b1cb0182f3d334dd8607697b5
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 platform/external/parameter-framework e210979b2eb1410f80fb88a9a4c235ee0cd23d0c
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 platform/external/pdfium e4e9d1b6b387072f9071f896993a9cfe5481ab4c
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 platform/external/ppp 7e60466a0009f58aa09b60bf6dbb96cacd6cb829
 platform/external/proguard af893cdc1242e4cfbeeb10e2323f9a689a825177
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 platform/external/regex-re2 79cce43a82abc1bc56c65de07a7df47d54e163a9
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 platform/external/robolectric 797e01c269d344b03f6080d46926c91603465949
 platform/external/roboto-fonts 25fa2dde3aacaeacb2797bcffddce96014f4fcc3
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 platform/external/safe-iop cd76f998688d145235de78ecd5b340d0eac9239d
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 platform/external/seccomp-tests e602290af558cee366ec98e366e0e8460c39534e
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 platform/external/slf4j b4eb5f69f088f53ede0b7ee4a1a3bf2c3ff58418
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 platform/external/squashfs-tools 393e365802711fb6969858f79d80104399d140c0
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 platform/external/svox 3279a68c2735ac1e1265ab2ecf5ee9c9afa076b3
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 platform/external/testng 8f2e8231852f454b5903cf886be55e9f647cdd76
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 platform/external/vixl 2da09a48dc4d5a3c585f897f256c2c6c5fa4eb5a
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 platform/external/wpa_supplicant_8 14c5ecd85f3fd6a703a8bef710690246c8dd42bb
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 platform/frameworks/data-binding 15281a01df0a5892d818080f1df669bdb8a319f7
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 platform/frameworks/ml 3d53a93c79beb608ca52f7e1ffbf2fc7d9c3722f
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 platform/frameworks/opt/bitmap a0d4e3108663202564a6833b76770075b8e5b767
-platform/frameworks/opt/bluetooth 971623a90fae3dd4e2f5d1d48c8f8ca50068344e
+platform/frameworks/opt/bluetooth 991e0444ed6edb1a77b0feae73c14e2a886cbf0d
 platform/frameworks/opt/calendar 886d7d1277b82347c30ec5d79ba1576680947bb8
 platform/frameworks/opt/chips 02ced36ad1e062e79397296ebd1dc760870a4e42
 platform/frameworks/opt/colorpicker c1d5eb2d31fb6a74ed129722754139c759aedbe8
@@ -333,21 +336,21 @@
 platform/frameworks/opt/emoji 92eede13edbf22b501edb9aeb92366f91eab9781
 platform/frameworks/opt/inputconnectioncommon 3baece9b20fa480da46d860acd7320fd9eee3386
 platform/frameworks/opt/inputmethodcommon 990fcb1a6dbb5d1204cc8ec86e4bc3f691f4aeeb
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-platform/frameworks/opt/net/ims b10b61e10955b1ceee6193acbc543e4d62ae0fd6
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+platform/frameworks/opt/net/ims ff0979256d1a67a62c726d6fe15264c496990605
 platform/frameworks/opt/net/voip 2e09c0ba8a11ee629a85582413598c60cca09e8e
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-platform/frameworks/opt/photoviewer fa19a401cc279cb95b071dbed650fa0285a2fdcb
+platform/frameworks/opt/net/wifi a4a7244fea03df223af726b0e8a4028593bd8e4b
+platform/frameworks/opt/photoviewer c0793686e13dafc2f45b0ad3e079f707938c6534
 platform/frameworks/opt/setupwizard 2cce48fde424bd078f024d5ddc7c564ca1161e2f
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+platform/frameworks/opt/telephony bfc44f2e2ac6cb8e8ba51e4250a10401714bf198
 platform/frameworks/opt/timezonepicker e344fd847c154f2d0680bf1089390326d634d847
 platform/frameworks/opt/vcard 15d297d8ac4664e4a491448d9c15158ee51714f9
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 platform/hardware/akm 7889f98849ad3913586904e00d91b32cc0ceb75b
-platform/hardware/broadcom/libbt 50330f8ce5e7edd2b15f9a3415a71db3d83d584d
+platform/hardware/broadcom/libbt 1ed4bedf4af755edc61bccb8f468a0df008dcf1f
 platform/hardware/broadcom/wlan 052255ec30cf33e27bb0406cd5b3f9998325d6e4
 platform/hardware/google/apf b75c9f3714cfae3dad3d976958e063150781437e
 platform/hardware/intel/audio_media 218f0d6bc9532d0b707ea325fd96998249fe47bf
@@ -364,17 +367,17 @@
 platform/hardware/intel/img/psb_headers aed9716b5467e75728f761ac75a4ba5ca3c51ea0
 platform/hardware/intel/img/psb_video 7407927b0eda431b7d817cb9d78189f335f509b1
 platform/hardware/intel/sensors 68dc9e70b79dacddc4e0bf00af0de7f764b04eed
-platform/hardware/interfaces 8b4c1e458997ed8c8b9bc97e4af4d4c3675c7c80
+platform/hardware/interfaces 1bbe51d0b5bef615692afe6ccc24259c1b2208e4
 platform/hardware/invensense 11e5ff75af866f91622b6008fa13db1c3685ae69
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+platform/hardware/libhardware f12e85e1d3aa640922686d9c4cab992684812535
+platform/hardware/libhardware_legacy 483a68f68a3f7f115f8909d663e93edaf89762f5
 platform/hardware/marvell/bt 3f33d194e8300816b94d1d7b68b1d48c8f903251
 platform/hardware/qcom/audio ba9bce36176b05695bd042acadc4a254ab911872
 platform/hardware/qcom/bootctrl 6007fe6af3f7eb0c6b5fc3cab3c0f0cf5a7b50fe
 platform/hardware/qcom/bt 5e2825785169ae647e80ce48ac814abe2ca57532
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 platform/hardware/qcom/data/ipacfg-mgr cc379d116231083e1b804fea9b0ef52d9e105ae1
-platform/hardware/qcom/display f7f41ff01430662e40a87f6c5582ce8a68c68d1e
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 platform/hardware/qcom/gps 45c0574442a01c2f6a9ccb2044b6f30c7ad288e4
 platform/hardware/qcom/keymaster 29565ce1f9219e66b7fb40063d49d14bb84ba606
 platform/hardware/qcom/media 63abe022daf627edac121f5c389d7f660db547ac
@@ -385,27 +388,27 @@
 platform/hardware/qcom/msm8x27 8ff5c0057cbdecfa09410c1710ba043e191a2862
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 platform/libnativehelper d0865381b9f1989fc059bb8ae4c31519b56b1b5a
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 platform/packages/apps/BasicSmsReceiver 0aa0611f9c6775575da56a1746fef1cf68267b0e
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 platform/packages/apps/CertInstaller 7562fee50a9db5afa94786f1d3acb1f0452e3ea7
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+platform/test/vts-testcase/kernel 2dbc05a69a87109b04ba9462bf39d2209202d0b0
+platform/test/vts-testcase/performance 04538ffdca38754da367d51ed825999727654654
+platform/test/vts-testcase/security 3c8938ec3c75b4b6a4649a22d3478822ac2dedd7
+platform/test/vts-testcase/vndk b2b66733c0b5717736d96945e02ee2926583cc5b
 platform/tools/adt/idea d3106c42c5466362da9bfb9f7453e5d60af83579
-platform/tools/apksig 3222d6c8a40307c4912ab80d666dcb6846840dea
+platform/tools/apksig 2ded5eb392c26eb13b96bfcec7e3517bb06eb94c
 platform/tools/base 908b391a9c006af569dfaff08b37f8fdd6c4da89
 platform/tools/build 69c4b95102b4b9862bfba68b3eaf5b7537a705ee
-platform/tools/external/fat32lib 3880776e41ff7def06e351720f2d162f88b58a03
-platform/tools/external/gradle 9def4e521826e3f3ed6cd7c4048cc5f293e63a88
+platform/tools/external/fat32lib 70067d87eb7b1cf6eb84a5c3d476225898177eba
+platform/tools/external/gradle bd3466bb3119802994f2d149bab648af567335a2
 platform/tools/idea 9b5d02ac8c92b1e71523cc15cb3d168d57fbd898
-platform/tools/loganalysis a49409b51f0bafe428c4d1bf73e36ee67d5234ab
+platform/tools/loganalysis 53720799c7f266384c3d2cb032082a94f0730cae
 platform/tools/motodev 69989786cefbde82527960a1e100ec9afba46a98
 platform/tools/repohooks 4c4e78c4d9b52a1a5c5ed11c39ab36d258037a2c
 platform/tools/studio/cloud 58f06e77e051fff3903adabca7acdaa9dd12ec2d
 platform/tools/swt 8996e71047a2bd11efee46ef14e02435ab5fa07a
-platform/tools/test/connectivity f43366e288f03e501a45cd96a9fcf972d75f16b1
-platform/tools/tradefederation 5886802f8050ecf0073dce1b8c2412dd331d250d
-platform/tools/tradefederation/contrib 0b0e7d254039081f40461b4d8a4ddb0910c3be59
-toolchain/binutils c80811581709b9346364e3229b888f9ad830cdf5
+platform/tools/test/connectivity 0cb4ea62fddd022bd1c3b6413f2869045863c267
+platform/tools/tradefederation 7100660d5379dc3fd8124daa3bdeb4c92d041b35
+platform/tools/tradefederation/contrib 520eaa2ec95619705f8574c1b7e47e4fea28b654
+toolchain/binutils 1661a29f471199a57719ff27eed5af7d7714376e
diff --git a/report.py b/report.py
index 5ed633b..87a7c97 100644
--- a/report.py
+++ b/report.py
@@ -28,9 +28,16 @@
 import re
 import subprocess
 import sys
-from tkFont import *
-from Tkinter import *
-from ttk import *
+
+try:
+    from tkinter import *
+    from tkinter.font import Font
+    from tkinter.ttk import *
+except ImportError:
+    from Tkinter import *
+    from tkFont import Font
+    from ttk import *
+
 from utils import *
 
 PAD_X = 3
@@ -188,7 +195,7 @@
     frame = Frame(master)
     frame.pack(fill=BOTH, expand=1)
 
-    font = Font(family='courier', size=10)
+    font = Font(family='courier', size=12)
 
     # Report Context
     for line in report_context:
@@ -279,7 +286,7 @@
 def call_simpleperf_report(args, report_file):
   output_fh = open(report_file, 'w')
   simpleperf_path = get_host_binary_path('simpleperf')
-  args = [simpleperf_path, 'report'] + args
+  args = [simpleperf_path, 'report', '--full-callgraph'] + args
   subprocess.check_call(args, stdout=output_fh)
   output_fh.close()
 
diff --git a/simpleperf_report_lib.py b/simpleperf_report_lib.py
index de90466..c540059 100644
--- a/simpleperf_report_lib.py
+++ b/simpleperf_report_lib.py
@@ -37,17 +37,11 @@
 
 
 def _char_pt(str):
-    if sys.version_info < (3, 0):
-        return str
-    # In python 3, str are wide strings whereas the C api expects 8 bit strings, hence we have to convert
-    # For now using utf-8 as the encoding.
-    return str.encode('utf-8')
+    return str_to_bytes(str)
 
 
 def _char_pt_to_str(char_pt):
-    if sys.version_info < (3, 0):
-        return char_pt
-    return char_pt.decode('utf-8')
+    return bytes_to_str(char_pt)
 
 
 class SampleStruct(ct.Structure):
diff --git a/utils.py b/utils.py
index d5515ba..a0b3b3b 100644
--- a/utils.py
+++ b/utils.py
@@ -31,6 +31,9 @@
 def is_windows():
     return sys.platform == 'win32' or sys.platform == 'cygwin'
 
+def is_python3():
+    return sys.version_info >= (3, 0)
+
 
 def log_debug(msg):
     logging.debug(msg)
@@ -47,6 +50,17 @@
 def log_fatal(msg):
     raise Exception(msg)
 
+def str_to_bytes(str):
+    if not is_python3():
+        return str
+    # In python 3, str are wide strings whereas the C api expects 8 bit strings, hence we have to convert
+    # For now using utf-8 as the encoding.
+    return str.encode('utf-8')
+
+def bytes_to_str(bytes):
+    if not is_python3():
+        return bytes
+    return bytes.decode('utf-8')
 
 def get_target_binary_path(arch, binary_name):
     if arch == 'aarch64':
@@ -90,24 +104,30 @@
         return self.run_and_return_output(adb_args)[0]
 
 
-    def run_and_return_output(self, adb_args):
+    def run_and_return_output(self, adb_args, stdout_file=None):
         adb_args = [self.adb_path] + adb_args
         log_debug('run adb cmd: %s' % adb_args)
-        subproc = subprocess.Popen(adb_args, stdout=subprocess.PIPE)
-        (stdoutdata, _) = subproc.communicate()
-        result = (subproc.returncode == 0)
+        if stdout_file:
+            with open(stdout_file, 'wb') as stdout_fh:
+                returncode = subprocess.call(adb_args, stdout=stdout_fh)
+            stdoutdata = ''
+        else:
+            subproc = subprocess.Popen(adb_args, stdout=subprocess.PIPE)
+            (stdoutdata, _) = subproc.communicate()
+            returncode = subproc.returncode
+        result = (returncode == 0)
         if stdoutdata:
+            stdoutdata = bytes_to_str(stdoutdata)
             log_debug(stdoutdata)
         log_debug('run adb cmd: %s  [result %s]' % (adb_args, result))
         return (result, stdoutdata)
 
-
     def check_run(self, adb_args):
         self.check_run_and_return_output(adb_args)
 
 
-    def check_run_and_return_output(self, adb_args):
-        result, stdoutdata = self.run_and_return_output(adb_args)
+    def check_run_and_return_output(self, adb_args, stdout_file=None):
+        result, stdoutdata = self.run_and_return_output(adb_args, stdout_file)
         if not result:
             log_fatal('run "adb %s" failed' % adb_args)
         return stdoutdata
@@ -143,7 +163,12 @@
     if not os.path.exists(config_file):
         log_fatal("can't find config_file: %s" % config_file)
     config = {}
-    execfile(config_file, config)
+    if is_python3():
+        with open(config_file, 'r') as fh:
+            source = fh.read()
+            exec(source, config)
+    else:
+        execfile(config_file, config)
     return config