linux-kernel - Re: [PATCH v2] perf stat: Append to default list if use -e +event

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Date:   Tue, 12 Jan 2021 11:08:07 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v2] perf stat: Append to default list if use -e +event

On Mon, Jan 04, 2021 at 10:18:37AM +0800, Jin Yao wrote:
> The default event list includes the most common events which are widely
> used by users. But with -e option, the current perf only counts the events
> assigned by -e option. Users may want to collect some extra events with
> the default list. For this case, users have to manually add all the events
> from the default list. It's inconvenient. Also, users may don't know how to
> get the default list.
> 
> Now it supports a simple syntax: -e +event
> 
> The prefix '+' tells perf to append this event (or event list) to default
> event list.
> 
> Before:
> 
> root@...-ppc:~# ./perf stat -e power/energy-pkg/ -a -- sleep 1
> 
>  Performance counter stats for 'system wide':
> 
>               2.04 Joules power/energy-pkg/
> 
>        1.000863884 seconds time elapsed
> 
> After:
> 
> root@...-ppc:~# ./perf stat -e +power/energy-pkg/ -a -- sleep 1
> 
>  Performance counter stats for 'system wide':
> 
>               2.11 Joules +power/energy-pkg/        #    0.000 K/sec

I dont think we should print the extra '+' prefix

jirka

>           8,007.17 msec   cpu-clock                 #    7.993 CPUs utilized
>                125        context-switches          #    0.016 K/sec
>                  8        cpu-migrations            #    0.001 K/sec
>                  2        page-faults               #    0.000 K/sec
>          8,520,084        cycles                    #    0.001 GHz
>          2,808,302        instructions              #    0.33  insn per cycle
>            555,427        branches                  #    0.069 M/sec
>             59,005        branch-misses             #   10.62% of all branches
> 
>        1.001832003 seconds time elapsed
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>