|
|
| (21 intermediate revisions by 12 users not shown) |
| Line 1: |
Line 1: |
| = Profiling with oprofile = | | = Profiling with the gecko profiler = |
| OProfile is a system-wide profiler for Linux systems. The detail description about OProfile please refer to below url<br>
| |
| http://oprofile.sourceforge.net/news/
| |
|
| |
|
| OProfile consists of three portions, linux kernel driver, userspace applications and collected profiling samplings.<br>
| | Good at: Native stacks (with runtime options) + javascript profiling, low overhead sampling, familiar for gecko developers |
|
| |
|
| == Prepare the Linux Kernel ==
| | See [https://developer.mozilla.org/en-US/docs/Performance/Profiling_with_the_Built-in_Profiler#Profiling_Boot_to_Gecko_%28with_a_real_device%29 these instructions]. Patches are in-flight to get native stacks in profiles, but that's not in default configurations yet. |
| Please make sure you have turned on below features in kerenl configuration file. The kerenl configuration file will be .config in your linux kernel directory normally. You need to recompile linux kernel after turn on OProfile feature.
| |
|
| |
|
| <pre>
| | = Profiling with systrace = |
| CONFIG_PROFILING=y
| | Good at: Shows process preemption, shows all calls to instrumented functions, Familiar for android developers |
| CONFIG_OPROFILE=y
| |
| CONFIG_HAVE_OPROFILE=y
| |
| </pre>
| |
|
| |
|
| == userspace applications ==
| | Bad at: Requires configure option, higher overhead |
| Userspace applications of OProfile includes opcontrol and oprofiled. You can find source code of OProfile in glue/gonk/external/oprofile.<br>
| |
|
| |
|
| == host application ==
| | *Download android sdk to get systrace tool: |
| use host utility opreport to analysis profiling samples<br>
| | **[http://developer.android.com/sdk/index.html 1. download link] |
| you can need to install it in your host system.
| | **2. the systrace.py tool is at path-to-android-sdk/tools/systrace |
| <pre>
| |
| sudo apt-get install oprofile
| |
| </pre>
| |
|
| |
|
| == Five Steps to profile your target device ==
| | *Enable systrace in B2G: |
| To make it easier to use OProfile on B2G project, several Makefile targets have been written.
| | **Build with '--enable-systrace' config or just uncomment the MOZ_USE_SYSTRACE define in gecko/tools/profiler/GeckoProfilerImpl.h like: |
| <pre>
| |
| make op_setup # start up oprofile
| |
| make op_start # start profiling
| |
| make op_status # check status
| |
| make op_stop # stop profiling
| |
| make op_pull # pull profile data from phone
| |
| make op_show # save profiling result in oprofile/oprofile.log
| |
| </pre>
| |
| ===make op_setup===
| |
| prepare opsetup script file and push it to target device. <br>
| |
| opsetup script will wake up oprofiled and setup trigger event.<br>
| |
| The snapshot of opsetup is listed below<br>
| |
| <pre> | | <pre> |
| opcontrol --setup<br>
| | #define MOZ_USE_SYSTRACE |
| opcontrol --vmlinux=/home/vincent/project/B2G_20120217/boot/kernel-android-galaxy-s2/vmlinux --kernel-range=0xc059c000, 0xc0c06000 --event=CPU_CYCLES<br>
| | #ifdef MOZ_USE_SYSTRACE |
| | # define ATRACE_TAG ATRACE_TAG_ALWAYS |
| | // We need HAVE_ANDROID_OS to be defined for Trace.h. |
| | // If its not set we will set it temporary and remove it. |
| | # ifndef HAVE_ANDROID_OS |
| | # define HAVE_ANDROID_OS |
| | # define REMOVE_HAVE_ANDROID_OS |
| | # endif |
| </pre> | | </pre> |
|
| |
|
| ===make op_start===
| | *How to use systrace: |
| We use "adb shell opcontrol --start" to start profiling and collect samples in target device<br>
| | **[http://developer.android.com/tools/help/systrace.html systrace.py document] |
| ===make op_status===
| | **./systrace.py --time=10 -o mynewtrace.html sched |
| We use "adb shell opcontrol --status" to check profiling status<br>
| |
| <pre>
| |
| Driver directory: /dev/oprofile
| |
| Session directory: /data/oprofile
| |
| Counter 0:
| |
| name: CPU_CYCLES
| |
| count: 150000
| |
| Counter 1 disabled
| |
| Counter 2 disabled
| |
| Counter 3 disabled
| |
| Counter 4 disabled
| |
| oprofiled pid: 3074
| |
| profiler is running
| |
| 5621 samples received
| |
| 0 samples lost overflow
| |
| </pre>
| |
| ===make op_stop===
| |
| we use "adb shell opcontrol --stop" to stop profiling<br>
| |
| ===make op_pull===
| |
| pull profiling samples from target device to host PC and copy the related binary files to correlate symbols and memory address
| |
| ===make op_show===
| |
| use opreport to analysis profiling samples<br>
| |
| use sudo apt-get install oprofile to install it in your host system
| |
| <pre>
| |
| CPU: ARM Cortex-A9, speed 0 MHz (estimated)
| |
| Counted CPU_CYCLES events (Number of CPU cycles) with a unit mask of 0x00 (No unit mask) count 150000
| |
| samples % image name app name symbol name
| |
| 5438 9.9701 libmozglue.so libmozglue.so __aeabi_idiv
| |
| 2811 5.1537 libGLESv2_mali.so libGLESv2_mali.so /system/lib/egl/libGLESv2_mali.so
| |
| 2348 4.3049 libc.so libc.so __aeabi_idiv
| |
| 2083 3.8190 libxul.so libxul.so pixman_composite_over_8888_8_8888_asm_neon
| |
| 1556 2.8528 libxul.so libxul.so pixman_composite_over_8888_8888_asm_neon
| |
| 1337 2.4513 libxul.so libxul.so pixman_scaled_bilinear_scanline_8888_8888_OVER_asm_neon
| |
| 594 1.0890 libc.so libc.so timesub
| |
| 578 1.0597 libxul.so libxul.so __aeabi_l2f
| |
| 547 1.0029 libmozglue.so libmozglue.so __aeabi_uidiv
| |
| 421 0.7719 libc.so libc.so localsub
| |
| 383 0.7022 libc.so libc.so memset
| |
| 357 0.6545 libxul.so libxul.so pixman_composite_over_n_8888_asm_neon
| |
| 341 0.6252 libxul.so libxul.so pixman_composite_over_n_8_8888_asm_neon
| |
| 308 0.5647 libxul.so libxul.so pixman_composite_src_8888_8888_asm_neon
| |
| 304 0.5574 libm.so libm.so floor
| |
| 211 0.3869 libc.so libc.so __findenv
| |
| 208 0.3814 libc.so libc.so pthread_mutex_lock
| |
| 201 0.3685 libmozglue.so libmozglue.so arena_malloc
| |
| 193 0.3538 libmozglue.so libmozglue.so arena_dalloc
| |
| 180 0.3300 libm.so libm.so fmod
| |
| 177 0.3245 libxul.so libxul.so nsIFrame::FinishAndStoreOverflow(nsOverflowAreas&, nsSize)
| |
| 176 0.3227 libc.so libc.so __system_property_find
| |
| 174 0.3190 libxul.so libxul.so gfx3DMatrix::Transform3D(gfxPoint3D const&) const
| |
| 171 0.3135 libxul.so libxul.so pixman_composite_src_n_8888_asm_neon
| |
| 162 0.2970 libc.so libc.so time2sub.clone.2
| |
| 161 0.2952 libxul.so libxul.so PL_DHashTableOperate
| |
| </pre>
| |
|
| |
|
| = Profiling with perf =
| | Note: Gecko code is tagged as ATRACE_TAG_ALWAYS, so we don't set the category type. |
| The perf utility is a performance analysis tools for Linux.<br>Please read about [[B2G/Profiling/perf|profiling B2G with perf]].
| |
Profiling with the gecko profiler
Good at: Native stacks (with runtime options) + javascript profiling, low overhead sampling, familiar for gecko developers
See these instructions. Patches are in-flight to get native stacks in profiles, but that's not in default configurations yet.
Profiling with systrace
Good at: Shows process preemption, shows all calls to instrumented functions, Familiar for android developers
Bad at: Requires configure option, higher overhead
- Download android sdk to get systrace tool:
- 1. download link
- 2. the systrace.py tool is at path-to-android-sdk/tools/systrace
- Enable systrace in B2G:
- Build with '--enable-systrace' config or just uncomment the MOZ_USE_SYSTRACE define in gecko/tools/profiler/GeckoProfilerImpl.h like:
#define MOZ_USE_SYSTRACE
#ifdef MOZ_USE_SYSTRACE
# define ATRACE_TAG ATRACE_TAG_ALWAYS
// We need HAVE_ANDROID_OS to be defined for Trace.h.
// If its not set we will set it temporary and remove it.
# ifndef HAVE_ANDROID_OS
# define HAVE_ANDROID_OS
# define REMOVE_HAVE_ANDROID_OS
# endif
Note: Gecko code is tagged as ATRACE_TAG_ALWAYS, so we don't set the category type.