Messages in this thread | | | Date | Mon, 11 Nov 2013 13:19:00 +0100 | From | Ingo Molnar <> | Subject | Re: [RFC/PATCHSET 00/14] perf report: Add support to accumulate hist periods (v2) |
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* David Ahern <dsahern@gmail.com> wrote:
> On 11/6/13, 4:47 AM, Ingo Molnar wrote: > >I'm not too worried about call-graph 'legacies': it generates such huge > >perf.data files which is parsed so slowly at the moment that there's very > >little user base ... Anyone who absolutely needs call-graph profiling uses > >SysProf which performs well. > > Actually, perf with callchains is used quite heavily on my products. > One of the selling points of perf.
That's nice to hear :)
In what way is call-graph profiling utilized typically?
Is it system-wide, i.e. something like:
perf record -a -g sleep 10
? If yes then that would explain why scalability problems rarely surfaced, it takes a longer user-space profile to get to the event counts where scalability started hurting.
Thanks,
Ingo
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