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

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Message-ID: <YboNUk+ThCpEf8mQ@kernel.org>
Date:   Wed, 15 Dec 2021 12:44:18 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...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)

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.

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

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.

- Arnaldo
 
> 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