On Tue, Mar 25, 2014 at 10:01 PM, Andi Kleen <a...@linux.intel.com> wrote: >> >> Timestamp are useful to order samples during reporting. >> How do you do with it if you monitor multi-threaded (multi-cpu) >> workloads. This is only good for single thread or single CPU >> measurements. Or am I missing something? > > For a perf report order doesn't matter (except against mmaps) > The CPUs are still separated of course > But getting the mmaps at the right moment is crucial for some apps especially if address space is recycled otherwise symbolization may be incorrect.
> You're right for some special analysis it matters, that is why > it is only an option. > > But for the standard "only care about perf report and > don't care about about program startup" case it's a nice saving. > How do you know in advance you won't need mmap ordering? -- 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/
