linux-kernel - Re: [PATCH] perf, tools: Fix metrics calculation with event qualifiers

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Date:	Wed, 9 Apr 2014 16:07:19 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...radead.org, mingo@...nel.org, linux-kernel@...r.kernel.org,
	peterz@...radead.org, eranian@...gle.com, namhyung@...nel.org,
	wcohen@...hat.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools: Fix metrics calculation with event
 qualifiers

On Tue, Mar 25, 2014 at 01:07:27PM -0700, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Currently in perf IPC and other metrics cannot be directly shown
> separately for both user and kernel in a single run. The problem was
> that the metrics matching code did not check event qualifiers.
> 
> With this patch the following case works correctly.
> 
> % perf stat -e cycles:k,cycles:u,instructions:k,instructions:u true
> 
>  Performance counter stats for 'true':
> 
>            531,718      cycles:k
>            203,895      cycles:u
>            338,151      instructions:k            #    0.64  insns per cycle
>            105,961      instructions:u            #    0.52  insns per cycle
> 
>        0.002989739 seconds time elapsed
> 
> Previously it would misreport the ratios because they were matching
> the wrong value.
> 
> The patch is fairly big, but quite mechanic as it just
> adds context indexes everywhere.
> 
> I didn't support Hypervisor. It's not clear it's worth it.
> 
> Reported-by: William Cohen <wcohen@...hat.com>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka
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