Linux ftrace, , Android Systrace. Android [2][3]. Linux ftrace. Linux. Intel VTune[6] perf timechart[7]. ,, GPU Intel. .

Transcription

1 Linux ftrace Dominic Hillenbrand 1 1 1,.,,.,., Linux ftrace., Intel Xeon X7560, ARMv7 equake, art, mpeg2enc OS., 1 Intel Xeon 1.07[us], ARM 4.44[us]., Linux, ftrace, 1...,.,,,., [1].,.,. 1 Waseda University, Android Systrace. Android Systrace Android [2][3]. Linux ftrace, ftrace Linux [4][5].,, Intel VTune[6] perf timechart[7].,. VTune OpenCL, GPU. VTune Intel Intel,., perf timechart Linux.,, Linux ftrace c 2014 Information Processing Society of Japan 1

2 .,,.,, ftrace. ftrace ID,,., HTML.,,., OSCAR., 2, 3 Annotatable Systrace. 4 OSCAR. 5,. 6,, Linux ftrace Linux ftrace ftrace Android Systrace. 2.1 Linux ftrace Linux ftrace Linux,. ftrace CONFIG_FUNCTION_TRACER. ftrace ftrace. # mount -t debugfs nodev /sys/kernel/debug/ ftrace function tracer,., /sys/kernel/debug/tracing/events/.. # cd /sys/kernel/debug/tracing # echo 1 > events/sched/sched_wakeup/enable # echo 1 > events/sched/sched_switch/enable 2.2 Android Systrace Android Systrace, Android SDK, Android,. ID Android HTML. 3. Annotatable Systrace Annotatable Systrace, Android Systrace.,., ID., HTML. HTML ID. 3.1 Annotatable Systrace, Annotatable Systrace Linux ftrace., Linux task_struct oscar_mt_str.., systrace., [8].,., /dev/., write.. trace_sched_switch task_struct., ftrace,. trace_sched_switch,., c 2014 Information Processing Society of Japan 2

3 .,,.,.,,.,., sched_getcpu CPU-ID, ID CPU.,,,., trace_sched_switch,., smp_processor_id., 1., write... trace_sched_switch,, ftrace,. 4. OSCAR, OSCAR [9][10]. OSCAR C Fortran,.,, (BB), BB 1 kernel buffer 0 buffer 1 buffer n trace_sched_switch device file smp_processor_id kernelspace /dev/cdev_char 0 /dev/cdev_char n userspace applica1on write (thread 0) /dev/cdev_char 1 write (thread 1) device file manager write (thread m)..,, (PE) (PG),., (BB) (RB), (SB) ( (MT))., RB, SB. MT, BB, RB, SB MT, (MFG). MFG MT, (MTG). MTG,,, MTG MT PG,. MTG, MT, MT PG. SB RB MTG, PG PE PG., PG MT Doall RB, RB c 2014 Information Processing Society of Japan 3

4 1 RS440 Server HitachiHA8000/RS440 OS Ubuntu LTS (64bit, Linux ) CPU Intel Xeon X7560 (2.27 GHz) 32 L2 Cache 2048KB L3 Cache 24576KB Compiler GCC RAM 32GB 2 Nexus Server Nexus OS Android 4.3 (64bit, Linux 3.4.0) CPU Qualcomm Snapdragon S4 Pro (1.7 GHz) 4 L2 Cache 2048KB Compiler arm-linux-gnueabihf-gcc RAM 2GB, PG PE., OSCAR. 5. OSCAR., Intel Xeon HA8000/RS440 ARM Nexus Intel Xeon X7560 Qualcomm Snapdragon S4 Pro., equake, art, mpeg2enc MPEG2 Encoder. MPEG2, MediaBench. MPEG2, EQUAKE. equake, SPEC (The Standard Performance Evaluation Corporation), SPEC 2000., ART. art, SPEC PE EQUAKE, Adaptive Resonance Theory 2 (ART2).,,. 6., OSCAR,,, 32PE., write,. 6.1 Nexus7 4PE equake,. 2. loop48, CPU0, 1, 2, 3 loop48., PE1 PE3 PE0., loop48 while, loop48.,,. 6.2 Nexus 7 4PE equake art,,. 3., barrier art,, PE pe equake., CPU0 art, CPU2 equake., c 2014 Information Processing Society of Japan 4

5 3 4PE EQUAKE ART 5 32PE EQUAKE 4 MPEG2ENC CPU1 CPU3 art equake., art equake CPU.,. CPU0, 2,.,.,,,,. 6.3 RS440 2PE mpeg2enc,. 4., CPU10 CPU8., CPU8 CPU9., PE RS440 32PE equake,. 5.,.,. loop48,. loop48 6., loop48, PE EQUAKE loop RS440 Nexus7 equake, art, mpeg2enc., write. 3, 4, , OSCAR RS440 32PE, Nexus7 4PE. systrace, nowrite, original, write, write, write., 5 write 1, us/call. 3 4, original, equake art 1.59, mpeg2enc 3.95.,. c 2014 Information Processing Society of Japan 5

6 3 RS440 [ ] systrace nowrite original equake art mpeg2enc Nexus7 [ ] systrace nowrite original equake art mpeg2enc write [us/call] RS Nexus write.,, write write.,. write, 5, 1 RS [us], Nexus7 4.44[us]. (2013). [4] Jake Edge: A look at ftrace, Articles/322666/ (2014). [5] Steven Rostedt: Debugging the kernel using Ftrace - part1, (2014). [6] Intel Corporation: Intel VTune Amplifier XE 2013, intel-vtune-amplifier-xe. [7] Stephane Eranian,Eric Gouriou, Tipp Moseley, Willem de Bruijn: perf, index.php/tutorial (2014). [8] Ariane Keller: Kernel Space - User Space Interfaces, kernel_user_space_howto.html (2014). [9],, : Fortran, (1990). [10],,,, :, (2003). 7. ftrace. OSCAR, RS440, Nexus7,,,,,.,. Android 4.3 Android API Trace,, Android Systrace. Trace. [1] Eileen Kramer, John T. Stasko: The Visualization of Parallel Systems: An Overview, Journal of Parallel and Distributed Computing (1993). [2] Google: Android Systrace, android.com/tools/help/systrace.html (2014). [3],,,,,, : Android 2D SKIA OSCAR, 199 ARC 142 HPC c 2014 Information Processing Society of Japan 6