On 8/10/13 10:34 AM, Peipei Wang wrote:
I get it. Is the timestamp for wall-clock or not??? What is the
counting unit of timestamp? Seconds??
It is a "perf_clock" timestamp in seconds.micro-seconds. On x86 the
timestamp is related to the TSC -- usually.
I have been on a 2-1/2 year mission and counting to get time-of-day
correlations into perf. e.g., see
https://github.com/dsahern/linux/tree/perf-time-of-day-3.8.
That branch has a kernel side change to add an ioctl to pull the
perf_clock timestamp into userspace. It does not include tracepoints to
catch ntpd updates for example.
David
swapper 0 [000] 1591103.081337: instructions: c1022ae6
int
swapper 0 [000] 1591103.081341: instructions: c1022ae6
int
swapper 0 [000] 1591103.081343: instructions: c1022ae6
int
swapper 0 [000] 1591103.081345: instructions: c1022ae6
int
swapper 0 [000] 1591103.081348: instructions: c1036a26
__t
swapper 0 [000] 1591103.081353: cycles: c1035e68
native_wr
swapper 0 [000] 1591103.081355: cycles: c1035e68
native_wr
swapper 0 [000] 1591103.081357: cycles: c1035e68
native_wr
swapper 0 [000] 1591103.081359: cycles: c1035e68
native_wr
swapper 0 [000] 1591103.081362: cycles: c101909c mwait_id
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