etaf

## make_verbose.sh
export VERBOSE=1
make

## arm_fp_stacktrace.txt
prologue:
mov ip, sp
stmdb sp!, {fp, ip, lr, pc}
sub fp, ip, #4

epilogue:
ldm sp, {fp, sp, pc}
======

==stack====

## find_threads_of_process.sh
ps -t <pid>

## get_cpu_core_id.c
//...
#include <sys/syscall.h>
//...
int getCpuId() {

    unsigned cpu;
    if (syscall(__NR_getcpu, &cpu, NULL, NULL) < 0) {
        return -1;
    } else {
        return (int) cpu;

## performance_tool_list.txt
perf:
https://github.com/KDAB/hotspot

gperftools:
https://github.com/gperftools/gperftools

cpp opt note:
https://github.com/facontidavide/CPP_Optimizations_Diary

online benchmark:

## linux-trace-pint
ls /sys/kernel/debug/tracing

## gist:727ec4601774941bfc555f759bc379be
adb shell getevent  | awk '{print $0,strtonum("0x" $NF)}'
# or
adb shell getevent  | awk '{ if($3 == "0035" || $3 == "0036" ) print $0,strtonum("0x" $4)}'

## search_git_history
# search by comment string
git log --grep="hello world"

# search commit modify a specific file
 git log --stat -p <file_path>

## simpleperf
python3 app_profiler.py -p com.example.com -lib ./symbols -r " -f 2000  -g --duration 2.5 --post-unwind=yes"  --ndk_path ./android-ndk-r20

## read_dyn_syms
arm-linux-androideabi-readelf --dyn-syms -W mylib.so
# -W: --wide , allow output width to execeed 80 chars.
	prologue:
	mov ip, sp
	stmdb sp!, {fp, ip, lr, pc}
	sub fp, ip, #4

	epilogue:
	ldm sp, {fp, sp, pc}
	======

	==stack====
	//...
	#include <sys/syscall.h>
	//...
	int getCpuId() {

	unsigned cpu;
	if (syscall(__NR_getcpu, &cpu, NULL, NULL) < 0) {
	return -1;
	} else {
	return (int) cpu;
	perf:
	https://github.com/KDAB/hotspot

	gperftools:
	https://github.com/gperftools/gperftools

	cpp opt note:
	https://github.com/facontidavide/CPP_Optimizations_Diary

	online benchmark:
	adb shell getevent \| awk '{print $0,strtonum("0x" $NF)}'
	# or
	adb shell getevent \| awk '{ if($3 == "0035" \|\| $3 == "0036" ) print $0,strtonum("0x" $4)}'
	# search by comment string
	git log --grep="hello world"

	# search commit modify a specific file
	git log --stat -p <file_path>
	arm-linux-androideabi-readelf --dyn-syms -W mylib.so
	# -W: --wide , allow output width to execeed 80 chars.