linux-kernel - Re: [Patch] perf stat: always separate stalled cycles per insn

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Date:   Tue, 28 May 2019 11:21:38 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [Patch] perf stat: always separate stalled cycles per insn

On Sun, May 19, 2019 at 11:59 PM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Fri, May 17, 2019 at 03:10:39PM -0700, Cong Wang wrote:
> > The "stalled cycles per insn" is appended to "instructions" when
> > the CPU has this hardware counter directly. We should always make it
> > a separate line, which also aligns to the output when we hit the
> > "if (total && avg)" branch.
> >
> > Before:
> > $ sudo perf stat --all-cpus --field-separator , --log-fd 1 -einstructions,cycles -- sleep 1
> > 4565048704,,instructions,64114578096,100.00,1.34,insn per cycle,,
> > 3396325133,,cycles,64146628546,100.00,,
> >
> > After:
> > $ sudo ./tools/perf/perf stat --all-cpus --field-separator , --log-fd 1 -einstructions,cycles -- sleep 1
> > 6721924,,instructions,24026790339,100.00,0.22,insn per cycle
> > ,,,,,0.00,stalled cycles per insn
> > 30939953,,cycles,24025512526,100.00,,
> >
> > Cc: Andi Kleen <ak@...ux.intel.com>
> > Cc: Jiri Olsa <jolsa@...nel.org>
> > Cc: Ingo Molnar <mingo@...hat.com>
> > Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> > Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Thanks for reviewing it. Is there anyone takes this patch?