linux-kernel - Re: [QUESTION]perf stat: comment of miss ratio

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Message-ID: <20191109024754.GA573472@tassilo.jf.intel.com>
Date:   Fri, 8 Nov 2019 18:47:54 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     "liuqi (BA)" <liuqi115@...ilicon.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Zhangshaokun <zhangshaokun@...ilicon.com>,
        huangdaode <huangdaode@...ilicon.com>,
        linyunsheng <linyunsheng@...wei.com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [QUESTION]perf stat: comment of miss ratio

>    Relevant code is checked to make sure that the ratio is calculated by
> 
>    L1-dcache-load-misses/L1-dcache-loads, data "7.58%=30249/399189*100%" also
> 
>    proves this conclusion.
> 
>    So, I'm not sure why we use "of all L1-dcache hits" here to describe miss
>    ratio,

Yes you're right it should be "of all L1-dcache accesses"

Please send a patch to fix the string and also check if this isn't wrong with some other
ratio too.

-Andi