当看到其他人开始开始在kernel log前加上时间戳感觉自己一定要找到方法，在从网上找到一个python脚本并加以研究后终于可以，这对于后面分析问题有帮助，记录便于后续使用，

现在很多平台如高通，MTK会在kernel log打上android  time ,  众所周知， 启动时间一直就在，因此根据这两个时间就可以打出来，借助以下脚本可以完成：

import time

import datetime

import sys

import getopt

import os

a_time = None

s_second = None

s_microsecone = None

abs_time = 0.0

inputfile = None

outputfile = None

def usage():

print('''Help Information:

-h, --help:        Show help information

-i, --inputfile:   input file  to parse

-o, --outputfile:  output fiel parsed

''')

def calc_delta(stream):

global s_second

global s_microsecond

global a_time

global outfile

begin_index = None

end_index = None

delta_second = 0

delta_mircosecond = 0

delta_time = 0

d_time = None

new_line = None

if a_time ==None:

print("Can't convert to android time")

exit(-1)

for line in stream:

if line:

try:

begin_index =  line.index('[')

end_index = line[begin_index+1:].index(']')+begin_index+1

time_string = line[begin_index + 1 :end_index]

[d_second,d_microsecond] = time_string.split('.')

delta_second = int(int(d_second) - int(s_second))

delta_microsecond = int(int(d_microsecond)-int(s_microsecond))

delta_time = datetime.timedelta(seconds=delta_second,microseconds=delta_microsecond)

d_time = a_time + delta_time

new_line = d_time.strftime("%m-%d %H:%M:%S.%f")+' ' + line

outputfile.write(new_line)

except:

outputfile.write(line)

def get_atime(stream):

global s_second

global s_microsecond

global a_time

a_time_op = None

begin_index = None

end_index = None

for line in stream:

if line:

a_time_op = line.find('android time')

if a_time_op>=1:

begin_index =  line.index('[')

end_index = line[begin_index+1:].index(']')+begin_index+1

date_string = line[a_time_op+13:].strip()

abs_time = line[begin_index + 1 :end_index]

[s_second,s_microsecond] = abs_time.split('.')

a_time = datetime.datetime.strptime(date_string, "%Y-%m-%d %H:%M:%S.%f")

break

def main(argv):

global inputfile

global outputfile

inputpath = None

outputpath = None

try:

opts, args = getopt.getopt(argv,"hi:o:",["help","inputfile=","outputfile="])

except getopt.GetoptError:

usage()

sys.exit(2)

for opt, arg in opts:

if opt in ("-h", "--help"):

usage()

sys.exit()

if opt in ("-i", "--inputfile"):

inputpath = arg

if opt in ("-o", "outputfile"):

outputpath = arg

if inputpath == None:

usage()

sys.exit()

if outputpath == None:

outputpath = os.getcwd()+"/out.txt"

inputfile = open(inputpath, 'r')

outputfile = open(outputpath, 'w')

get_atime(inputfile)

inputfile.seek(0)

calc_delta(inputfile)

inputfile.close()

outputfile.close()

if __name__ == "__main__":

main(sys.argv[1:])

使用后保存为kernel.py,  并且加入可执行权限， 执行./kernel.py  -i  kernel_log  -o  kernel.txt ,  打开kernel.txt 以后看到了时间点：

04-17 10:25:42.613815 <6>[   85.920214]-(2)[1859:kworker/u:3][[FH]] dis ok 04-17 10:25:42.613832 <6>[   85.920231]-(2)[1859:kworker/u:3][Power/clkmgr] [mt_disable_clock]: id=96, names=MFG 04-17 10:25:42.615021 <7>[   85.921420] (1)[1019:iatek.mtklogger][1019:iatek.mtklogger] fork [2253:iatek.mtklogger] 04-17 10:25:42.617548 <6>[   85.923947] (0)[270:mobile_log_d]socket_create[11339]:fd=24