linux-kernel - Re: [PATCH v3]: perf record: enable arbitrary event names thru name= modifier

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Date:   Mon, 4 Jun 2018 11:23:40 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...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 v3]: perf record: enable arbitrary event names thru name=
 modifier

Em Mon, Jun 04, 2018 at 05:19:11PM +0300, Alexey Budankov escreveu:
> Hi,
> 
> On 04.06.2018 16:58, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Jun 04, 2018 at 09:56:02AM +0200, Jiri Olsa escreveu:
> >> On Mon, Jun 04, 2018 at 09:50:56AM +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:
> > 
> > Applied, but there are other places where we show event names, such as:
> > 
> > [root@...et ~]# perf record -e cpu/name=\'OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM\',period=0x3567e0,event=0x3c,cmask=0x1/Duk
> > ^C[ perf record: Woken up 1 times to write data ]
> > [ perf record: Captured and wrote 1.599 MB perf.data (704 samples) ]
> > 
> > [root@...et ~]# perf evlist
> > OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM
> > [root@...et ~]# perf evlist -v
> > 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|CPU, disabled: 1, inherit: 1, pinned: 1, exclude_hv: 1, mmap: 1, comm: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1
> > [root@...et ~]# 
> > 
> > That I used to check if the period, etc were correctly set, etc. Perhaps
> > we should add that \'\' there as well?
> 
> Like this?
> 
> 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|CPU, disabled: 1, inherit: 1, pinned: 1, exclude_hv: 1, mmap: 1, comm: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1

Nope, I mean with the same intent you had when showing escaped single
quotes in the 'perf report' header, that users would copy'n'paste and
get something that works on the command line?

- Arnaldo
 
> Thanks,
> Alexey
> 
> > 
> > Also please consider adding an entry to tools/perf/tests/attr/ to make
> > sure this is checked everytime we run 'perf test attr' or plain 'perf
> > test'.
> > 
> > Those can be followup patches, so I'm applying this one, thanks.
> > 
> > - Arnaldo
> >