Martin Liška <mli...@suse.cz> writes: > I've been working on a new feature for perf annotate, which should be able to > annotate > instructions with total spent time (compared to percentage usage). > > Let's consider following use-case. You want to compare two different compilers > on the same code base and let's assume 90% of wall-time is spent in a single > function. > Moreover, let's say that these compilers produce assembly of a totally > different size. > > In such case, it's very useful to get an approximation of spent time on a > bunch of instructions, > which can be compared among other compilers. Otherwise, one has to somehow > sum percentages and compare > it to size of a function.
perf diff does not handle this? Especially with the differential profiling options it should. >> @@ -623,6 +624,8 @@ static int __cmd_record(struct record *rec, int argc, >> const char **argv) > if (!target__none(&opts->target) && !opts->initial_delay) > perf_evlist__enable(rec->evlist); > > + t0 = rdclock(); > + > /* > * Let the child rip > */ > @@ -692,6 +695,9 @@ static int __cmd_record(struct record *rec, int argc, > const char **argv) > goto out_child; > } > > + t1 = rdclock(); > + walltime_nsecs = t1 - t0; The walltime can be later computed by the difference of the first and the last time stamp after sorting the events. So you don't need the new header. -Andi -- a...@linux.intel.com -- Speaking for myself only -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
