linux-kernel - Re: [RFC/PATCHSET 0/5] perf ftrace: Implement function latency histogram (v1)

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Date:   Wed, 15 Dec 2021 10:08:53 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Song Liu <songliubraving@...com>,
        Changbin Du <changbin.du@...il.com>
Subject: Re: [RFC/PATCHSET 0/5] perf ftrace: Implement function latency
 histogram (v1)

Hi Arnaldo,

On Wed, Dec 15, 2021 at 8:08 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Wed, Dec 15, 2021 at 12:30:10PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Dec 13, 2021 at 11:40:16AM -0800, Namhyung Kim escreveu:
> > > On Mon, Dec 13, 2021 at 10:24 AM Arnaldo Carvalho de Melo
> > > <acme@...nel.org> wrote:
> > > >
> > > > Em Mon, Nov 29, 2021 at 03:18:25PM -0800, Namhyung Kim escreveu:
> > > > > Hello,
> > > > >
> > > > > I've implemented 'latency' subcommand in the perf ftrace command to
> > > > > show a histogram of function latency.
> > > >
> > > > This still applies cleanly, I'll test it later.
> > >
> > > Thank you Arnaldo!  While I have some small modifications
> > > but the functionality should be the same.  Please let me know
> > > if you have any suggestions.
> >
> > So, it is failing here with:
>
> So that 'fd' variable and the cpumap.h problems goes away when the last
> patch is applied, but for bisection its better to apply the patch below
> to 4/5.

Sure, I will move them.  Thanks for pointing that out.

>
> I tested it all, cool stuff, will you resubmit soon?

Yep!

>
> I pushed it to the tmp.perf/ftrace_bpf branch on my repo at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
>
> https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/log/?h=tmp.perf/ftrace_bpf
>
> With committer testing notes.

Thanks for the test!
Namhyung


>
> > Fixed with:
> >
> >
> > diff --git a/tools/perf/util/bpf_ftrace.c b/tools/perf/util/bpf_ftrace.c
> > index 1975a6fe73c9fa8b..f5b49fc056ab8b95 100644
> > --- a/tools/perf/util/bpf_ftrace.c
> > +++ b/tools/perf/util/bpf_ftrace.c
> > @@ -5,6 +5,7 @@
> >
> >  #include <linux/err.h>
> >
> > +#include "util/cpumap.h"
> >  #include "util/ftrace.h"
> >  #include "util/debug.h"
> >  #include "util/bpf_counter.h"
> > @@ -15,7 +16,7 @@ static struct func_latency_bpf *skel;
> >
> >  int perf_ftrace__latency_prepare_bpf(struct perf_ftrace *ftrace)
> >  {
> > -     int fd, err;
> > +     int err;
> >       struct filter_entry *func;
> >       struct bpf_link *begin_link, *end_link;
> >
>
> --
>
> - Arnaldo