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Message-ID: <ZCHWRpv5nDVQLR5s@kernel.org>
Date: Mon, 27 Mar 2023 14:45:42 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Yang Jihong <yangjihong1@...wei.com>, peterz@...radead.org,
mingo@...hat.com, mark.rutland@....com,
alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
irogers@...gle.com, adrian.hunter@...el.com,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf ftrace: Make system wide the default target for
latency subcommand
Em Mon, Mar 27, 2023 at 07:58:43AM -0700, Namhyung Kim escreveu:
> On Mon, Mar 27, 2023 at 4:34 AM Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> >
> > Em Fri, Mar 24, 2023 at 06:39:25PM -0700, Namhyung Kim escreveu:
> > > Hello,
> > >
> > > On Thu, Mar 23, 2023 at 8:29 PM Yang Jihong <yangjihong1@...wei.com> wrote:
> > > >
> > > > If no target is specified for 'latency' subcommand, the execution fails
> > > > because - 1 (invalid value) is written to set_ftrace_pid tracefs file.
> > > > Make system wide the default target, which is the same as the default
> > > > behavior of 'trace' subcommand.
> > >
> > > I followed the convention to use -a for system-wide profiling.
> > > Not sure if it's ok to make it default, but I don't object. :)
> >
> > I'll make that an Acked-by, ok?
>
> Sure.
>
> Acked-by: Namhyung Kim <namhyung@...nel.org>
Thanks!
- Arnaldo
> Thanks,
> Namhyung
>
>
> > > >
> > > > Before the fix:
> > > >
> > > > # perf ftrace latency -T schedule
> > > > failed to set ftrace pid
> > > >
> > > > After the fix:
> > > >
> > > > # perf ftrace latency -T schedule
> > > > ^C# DURATION | COUNT | GRAPH |
> > > > 0 - 1 us | 0 | |
> > > > 1 - 2 us | 0 | |
> > > > 2 - 4 us | 0 | |
> > > > 4 - 8 us | 2828 | #### |
> > > > 8 - 16 us | 23953 | ######################################## |
> > > > 16 - 32 us | 408 | |
> > > > 32 - 64 us | 318 | |
> > > > 64 - 128 us | 4 | |
> > > > 128 - 256 us | 3 | |
> > > > 256 - 512 us | 0 | |
> > > > 512 - 1024 us | 1 | |
> > > > 1 - 2 ms | 4 | |
> > > > 2 - 4 ms | 0 | |
> > > > 4 - 8 ms | 0 | |
> > > > 8 - 16 ms | 0 | |
> > > > 16 - 32 ms | 0 | |
> > > > 32 - 64 ms | 0 | |
> > > > 64 - 128 ms | 0 | |
> > > > 128 - 256 ms | 4 | |
> > > > 256 - 512 ms | 2 | |
> > > > 512 - 1024 ms | 0 | |
> > > > 1 - ... s | 0 | |
> > > >
> > > > Fixes: 53be50282269 ("perf ftrace: Add 'latency' subcommand")
> > > > Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
> > > > ---
> > > > tools/perf/builtin-ftrace.c | 6 ++++--
> > > > 1 file changed, 4 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
> > > > index d7fe00f66b83..fb1b66ef2e16 100644
> > > > --- a/tools/perf/builtin-ftrace.c
> > > > +++ b/tools/perf/builtin-ftrace.c
> > > > @@ -1228,10 +1228,12 @@ int cmd_ftrace(int argc, const char **argv)
> > > > goto out_delete_filters;
> > > > }
> > > >
> > > > + /* Make system wide (-a) the default target. */
> > > > + if (!argc && target__none(&ftrace.target))
> > > > + ftrace.target.system_wide = true;
> > > > +
> > > > switch (subcmd) {
> > > > case PERF_FTRACE_TRACE:
> > > > - if (!argc && target__none(&ftrace.target))
> > > > - ftrace.target.system_wide = true;
> > > > cmd_func = __cmd_ftrace;
> > > > break;
> > > > case PERF_FTRACE_LATENCY:
> > > > --
> > > > 2.30.GIT
> > > >
> >
> > --
> >
> > - Arnaldo
--
- Arnaldo
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