linux-kernel - Re: [PATCH] perf stat: clarify unsupported events from uncounted events

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Message-ID: <20110528180848.GC12530@elte.hu>
Date:	Sat, 28 May 2011 20:08:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	acme@...stprotocols.net, peterz@...radead.org, fweisbec@...il.com,
	paulus@...ba.org, tglx@...utronix.de
Subject: Re: [PATCH] perf stat: clarify unsupported events from uncounted
 events


* David Ahern <dsahern@...il.com> wrote:

> After:
> 
> perf stat -ddd -- sleep 1
> 
>  Performance counter stats for 'sleep 1':
> 
>           1.350326 task-clock                #    0.001 CPUs utilized
>                  2 context-switches          #    0.001 M/sec
>                  0 CPU-migrations            #    0.000 M/sec
>                157 page-faults               #    0.116 M/sec
>             11,986 cycles                    #    0.009 GHz
>    <not supported> stalled-cycles-frontend
>    <not supported> stalled-cycles-backend
>            496,986 instructions              #   41.46  insns per cycle
>            138,065 branches                  #  102.246 M/sec
>              7,245 branch-misses             #    5.25% of all branches         [97.60%]
>      <not counted> L1-dcache-loads
>      <not counted> L1-dcache-load-misses
>      <not counted> LLC-loads
>      <not counted> LLC-load-misses
>      <not counted> L1-icache-loads
>      <not counted> L1-icache-load-misses
>      <not counted> dTLB-loads
>      <not counted> dTLB-load-misses
>      <not counted> iTLB-loads
>      <not counted> iTLB-load-misses
>      <not counted> L1-dcache-prefetches
>    <not supported> L1-dcache-prefetch-misses

That looks like a really useful distinction!

Thanks,

	Ingo
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