linux-kernel - Re: [PATCH 05/11] perf stat: Check existence of frontend/backed stalled cycles

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Date:	Thu, 3 Mar 2016 09:28:18 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 05/11] perf stat: Check existence of frontend/backed
 stalled cycles


* Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Before:
> 
>   $ perf stat ls
>   a.patch
> 
>   Performance counter stats for 'ls':
> 
>          0.822067 task-clock (msec)   #   0.873 CPUs utilized   (82.26%)
>                 0 context-switches    #   0.000 K/sec           (82.26%)
>                 0 cpu-migrations      #   0.000 K/sec           (82.26%)
>               125 page-faults         #   0.152 M/sec           (82.26%)
>         2,516,127 cycles              #   3.061 GHz             (82.84%)
>   <not supported> stalled-cycles-frontend
>   <not supported> stalled-cycles-backend
>         2,430,467 instructions        #   0.97  insn per cycle  (82.84%)
>           486,235 branches            # 591.479 M/sec           (82.84%)
>            18,389 branch-misses       #   3.78% of all branches (82.84%)
> 
>       0.000941536 seconds time elapsed
>   $
> 
> After:
> 
>   $ perf stat ls
>   a.patch
> 
>   Performance counter stats for 'ls':
> 
>          0.824919 task-clock (msec)   #   0.893 CPUs utilized   (85.47%)
>                 0 context-switches    #   0.000 K/sec           (85.47%)
>                 0 cpu-migrations      #   0.000 K/sec           (85.47%)
>               124 page-faults         #   0.150 M/sec           (85.47%)
>           2521790 cycles              #   3.057 GHz             (86.15%)
>           2364913 instructions        #   0.94  insn per cycle  (86.15%)
>            471970 branches            # 572.141 M/sec           (86.15%)
>             16935 branch-misses       #   3.59% of all branches (86.15%)
> 
>       0.000923397 seconds time elapsed
>   $

Btw., the output format regression is visible in this changelog already...

Thanks,

	Ingo