linux-kernel - Re: [PATCH v2]: perf record: enable arbitrary event names thru name= modifier

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Message-ID: <20180601083611.GB2986@krava>
Date:   Fri, 1 Jun 2018 10:36:11 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2]: perf record: enable arbitrary event names thru name=
 modifier

On Thu, May 31, 2018 at 05:08:12PM +0300, Alexey Budankov wrote:
> 
> Enable complex event names containing [.:=,] symbols to be encoded into Perf 
> trace using name= modifier e.g. like this:
> 
> perf record -e cpu/name=\'OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM\',\
> 		period=0x3567e0,event=0x3c,cmask=0x1/Duk ./futex
> 
> Below is how it looks like in the report output. Please note explicit escaped 
> quoting at cmdline string in the header so that thestring can be directly reused
> for another collection in shell:
> 
> perf report --header
> 
> # ========
> ...
> # cmdline : /root/abudanko/kernel/tip/tools/perf/perf record -v -e cpu/name=\'OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM\',period=0x3567e0,event=0x3c,cmask=0x1/Duk ./futex 
> # event : name = OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM, , type = 4, size = 112, config = 0x100003c, { sample_period, sample_freq } = 3500000, sample_type = IP|TID|TIME, disabled = 1, inh
> ...
> # ========
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 24K of event 'OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM'
> # Event count (approx.): 86492000000
> #
> # Overhead  Command  Shared Object     Symbol                                        
> # ........  .......  ................  ..............................................
> #
>     14.75%  futex    [kernel.vmlinux]  [k] __entry_trampoline_start
> ...
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka