linux-kernel - Re: [PATCH 4/4] perf, tools: Add perf stat --transaction v3

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Date:	Thu, 15 Aug 2013 16:29:25 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...nel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 4/4] perf, tools: Add perf stat --transaction v3

> >   * Update various tracking values we maintain to print
> >   * more semantic information such as miss/hit ratios,
> > @@ -283,8 +340,12 @@ static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
> >  		update_stats(&runtime_nsecs_stats[0], count[0]);
> >  	else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
> >  		update_stats(&runtime_cycles_stats[0], count[0]);
> > -	else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
> > -		update_stats(&runtime_stalled_cycles_front_stats[0], count[0]);
> 
> Why remove the test for HW_STALLED_CYCLES_FRONTEND?

Hmm that was probably a merge error.

I'll fix & resend.

> Got it why it doesn't need to account for the '{' in the array ;-)
> 
> While this works and isn't in any fast path, I find it ugly with all
> this looping in nth_evsel.
> 
> Why not:
> 
> 	} else if (evsel->idx == T_CYCLES_IN_TX)) &&
> 
> ? I guess this works as you expect, no?

I had some problems with people using -T, but also setting custom
events, that is why I added the extra comparison

The event lists are small enough that it's not really noticeable.
I suppose could set up an array once.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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