linux-kernel - Re: [PATCH] perf script: print cgroup on the same line as comm

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Date:   Tue, 8 Aug 2023 10:44:26 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>,
        Ivan Babrou <ivan@...udflare.com>
Cc:     Ian Rogers <irogers@...gle.com>, linux-perf-users@...r.kernel.org,
        kernel-team@...udflare.com, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] perf script: print cgroup on the same line as comm

Em Mon, Aug 07, 2023 at 11:02:01AM -0700, Ivan Babrou escreveu:
> On Fri, Jul 28, 2023 at 10:57 AM Ian Rogers <irogers@...gle.com> wrote:
> > On Fri, Jul 28, 2023 at 10:42 AM Ivan Babrou <ivan@...udflare.com> wrote:
> > > On Mon, Jul 17, 2023 at 5:07 PM Ivan Babrou <ivan@...udflare.com> wrote:
> > > > Commit 3fd7a168bf51 ("perf script: Add 'cgroup' field for output")
> > > > added support for printing cgroup path in perf script output.

> > > > It was okay if you didn't want any stacks:

> > > >     $ sudo perf script --comms jpegtran:23f4bf -F comm,tid,cpu,time,cgroup
> > > >     jpegtran:23f4bf 3321915 [013] 404718.587488:  /idle.slice/polish.service
> > > >     jpegtran:23f4bf 3321915 [031] 404718.592073:  /idle.slice/polish.service

> > > > With stacks it gets messier as cgroup is printed after the stack:

> > > >     $ perf script --comms jpegtran:23f4bf -F comm,tid,cpu,time,cgroup,ip,sym
> > > >     jpegtran:23f4bf 3321915 [013] 404718.587488:
> > > >                     5c554 compress_output
> > > >                     570d9 jpeg_finish_compress
> > > >                     3476e jpegtran_main
> > > >                     330ee jpegtran::main
> > > >                     326e2 core::ops::function::FnOnce::call_once (inlined)
> > > >                     326e2 std::sys_common::backtrace::__rust_begin_short_backtrace
> > > >     /idle.slice/polish.service
> > > >     jpegtran:23f4bf 3321915 [031] 404718.592073:
> > > >                     8474d jsimd_encode_mcu_AC_first_prepare_sse2.PADDING
> > > >                 55af68e62fff [unknown]
> > > >     /idle.slice/polish.service
> > > >
> > > > Let's instead print cgroup on the same line as comm:
> > > >
> > > >     $ perf script --comms jpegtran:23f4bf -F comm,tid,cpu,time,cgroup,ip,sym
> > > >     jpegtran:23f4bf 3321915 [013] 404718.587488:  /idle.slice/polish.service
> > > >                     5c554 compress_output
> > > >                     570d9 jpeg_finish_compress
> > > >                     3476e jpegtran_main
> > > >                     330ee jpegtran::main
> > > >                     326e2 core::ops::function::FnOnce::call_once (inlined)
> > > >                     326e2 std::sys_common::backtrace::__rust_begin_short_backtrace
> > > >
> > > >     jpegtran:23f4bf 3321915 [031] 404718.592073:  /idle.slice/polish.service
> > > >                     8474d jsimd_encode_mcu_AC_first_prepare_sse2.PADDING
> > > >                 55af68e62fff [unknown]
> > > >
> > > > Signed-off-by: Ivan Babrou <ivan@...udflare.com>
> > > > Fixes: 3fd7a168bf51 ("perf script: Add 'cgroup' field for output")

> > This change makes sense to me. Namhyung, wdyt?
 
> Hi Namhyung,
> 
> This is a really trivial patch and it would be good to get a word from you.

Hi, this solves the case for cgroup and I think it should be merged, but
what about the other fields that are being printed after the callchain
gets printed?

I looked and we would have to introduce a __sample__fprintf_sym that
didn't call sample__fprintf_callchain and use it in perf script's
process_event() then later call sample__fprintf_callchain after all the
fields that print on the same line.

Anyway, Namhyung, can I have your Acked-by for this patch to move things
forward at least for cgroups?

- Arnaldo