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, 23 February 2012→Profiling with oprofile
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= Profiling with oprofile = | = Profiling with oprofile = | ||
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> | |||
== Prepare the Linux Kernel == | |||
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. | |||
CONFIG_PROFILING=y<br> | |||
CONFIG_OPROFILE=y<br> | |||
CONFIG_HAVE_OPROFILE=y<br> | |||
== userspace applications == | |||
Userspace applications of OProfile includes opcontrol and oprofiled. You can find source code of OProfile in glue/gonk/external/oprofile.<br> | |||
== host application == | |||
use host utility opreport to analysis profiling samples<br> | |||
use sudo apt-get install oprofile to install it in your host system | |||
To make it easier to use OProfile, several targets have been written in Makefile under B2G directory. | |||
== Five Steps to profile your target device == | |||
===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> | |||
opcontrol --setup<br> | |||
opcontrol --vmlinux=/home/vincent/project/B2G_20120217/boot/kernel-android-galaxy-s2/vmlinux --kernel-range=0xc059c000, 0xc0c06000 --event=CPU_CYCLES<br> | |||
===make op_start=== | |||
We use "adb shell opcontrol --start" to start profiling and collect samples in target device<br> | |||
===make op_status=== | |||
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 = | = Profiling with perf = | ||
The perf utility is a performance analysis tools for Linux.<br>Please read about [[B2G/Profiling/perf|profiling B2G with perf]]. | The perf utility is a performance analysis tools for Linux.<br>Please read about [[B2G/Profiling/perf|profiling B2G with perf]]. | ||