Re: [PATCH] perf stat: Add event-interval-print option

[Andi Kleen]

On Thu, Aug 24, 2017 at 04:39:02PM -0400, Aaron Lindsay wrote:
> Does anyone have any feedback on this patch or the idea in general?
> 
> Also, (for our bookkeeping - not trying to rush things) is there any
> chance this will still make it in for the 4.14 merge window, or is it
> 4.15 material at the earliest?

You can already do that with leader sampling through perf record

e.g. 

% perf record -e '{cpu/cpu-cycles,period=10000/,branches,branch-misses}:S' ...

% perf script
   swapper     0 [005] 3905226.804037:      10210 cpu/cpu-cycles,period=10000/:  ffffffff9e87643c intel_idle ([kernel.kallsyms])
         swapper     0 [005] 3905226.804037:        345                     branches:  ffffffff9e87643c intel_idle ([kernel.kallsyms])
         swapper     0 [005] 3905226.804037:         58                branch-misses:  ffffffff9e87643c intel_idle ([kernel.kallsyms])
          :16797 16797 [004] 3905226.804038:      10160 cpu/cpu-cycles,period=10000/:  ffffffffc07fdd10 kvm_fetch_guest_virt ([kvm])
          :16797 16797 [004] 3905226.804038:        515                     branches:  ffffffffc07fdd10 kvm_fetch_guest_virt ([kvm])
          :16797 16797 [004] 3905226.804038:         19                branch-misses:  ffffffffc07fdd10 kvm_fetch_guest_virt ([kvm])

Yes it's a useful technique.

-Andi