리눅스커널 timestamp 찍는 법

linux kenel timestamp
--------------------------------------
include
include

char tbuf[50], *tp;
unsigned tlen;
unsigned long long t;
unsigned long nanosec_rem;
int this_cpu = smp_processor_id();

t = cpu_clock(this_cpu);
nanosec_rem = do_div(t, 1000000000);
tlen = sprintf(tbuf, "[%5lu.%06lu] ",
(unsigned long) t,
nanosec_rem / 1000);

iPhone 에서 작성된 글입니다.