linux-kernel - Re: [PATCH v2 2/6] perf report: Caculate and return the branch counting in callchain

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Message-ID: <20161020182036.GC1075@tassilo.jf.intel.com>
Date:   Thu, 20 Oct 2016 11:20:36 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Nilay Vaish <nilayvaish@...il.com>
Cc:     Jin Yao <yao.jin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Linux Kernel list <Linux-kernel@...r.kernel.org>,
        kan.liang@...el.com
Subject: Re: [PATCH v2 2/6] perf report: Caculate and return the branch
 counting in callchain

> OK, I am more confused now.  Are you predicting some quantity related
> to transactions?  Why would you divide abort count by branch count?
> Further, I just looked at patch 6/6.  It has the following text:
> 
> + Also show with some branch flags that can be:
> + - Predicted: display the average percentage of predicated branches.
> +     (predicated number / total number)
> + - Abort: display the average percentage of abort branches.
> + (abort number /total number)
> + - Cycles: cycles in basic block.
> 
> 
> I think there is inconsistency between what you are suggesting and
> what the patch has.

An abort is an unique branch. But yes there is no total number,
so the formula will always be 100%. So yes would probably be 
better to just display a count for abort.

-Andi