linux-kernel - Re: [PATCH] perf report: Display pregress bar on redirected pipe data

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Date: Thu, 27 Jun 2024 12:41:02 -0700
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, 
	LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf report: Display pregress bar on redirected pipe data

On Thu, Jun 27, 2024 at 11:19 AM Namhyung Kim <namhyung@...nel.org> wrote:
>
> It's possible to save pipe output of perf record into a file.
>
>   $ perf record -o- ... > pipe.data
>
> And you can use the data same as the normal perf data.
>
>   $ perf report -i pipe.data
>
> In that case, perf tools will treat the input as a pipe, but it can get
> the total size of the input.  This means it can show the progress bar
> unlike the normal pipe input (which doesn't know the total size in
> advance).
>
> While at it, fix the string in __perf_session__process_dir_events().
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/util/session.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index 0ec92d47373c..5596bed1b8c8 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -2050,6 +2050,7 @@ static int __perf_session__process_pipe_events(struct perf_session *session)
>  {
>         struct ordered_events *oe = &session->ordered_events;
>         struct perf_tool *tool = session->tool;
> +       struct ui_progress prog;
>         union perf_event *event;
>         uint32_t size, cur_size = 0;
>         void *buf = NULL;
> @@ -2057,9 +2058,21 @@ static int __perf_session__process_pipe_events(struct perf_session *session)
>         u64 head;
>         ssize_t err;
>         void *p;
> +       bool update_prog = false;
>
>         perf_tool__fill_defaults(tool);
>
> +       /*
> +        * If it's from a file saving pipe data (by redirection), it would have
> +        * a file name other than "-".  Then we can get the total size and show
> +        * the progress.
> +        */
> +       if (strcmp(session->data->path, "-") && session->data->file.size) {
> +               ui_progress__init_size(&prog, session->data->file.size,
> +                                      "Processing events...");
> +               update_prog = true;
> +       }
> +
>         head = 0;
>         cur_size = sizeof(union perf_event);
>
> @@ -2131,6 +2144,9 @@ static int __perf_session__process_pipe_events(struct perf_session *session)
>         if (err)
>                 goto out_err;
>
> +       if (update_prog)
> +               ui_progress__update(&prog, size);
> +
>         if (!session_done())
>                 goto more;
>  done:
> @@ -2144,6 +2160,8 @@ static int __perf_session__process_pipe_events(struct perf_session *session)
>         err = perf_session__flush_thread_stacks(session);
>  out_err:
>         free(buf);
> +       if (update_prog)
> +               ui_progress__finish();
>         if (!tool->no_warn)
>                 perf_session__warn_about_errors(session);
>         ordered_events__free(&session->ordered_events);
> @@ -2523,7 +2541,7 @@ static int __perf_session__process_dir_events(struct perf_session *session)
>
>         perf_tool__fill_defaults(tool);
>
> -       ui_progress__init_size(&prog, total_size, "Sorting events...");
> +       ui_progress__init_size(&prog, total_size, "Processing events...");
>
>         nr_readers = 1;
>         for (i = 0; i < data->dir.nr; i++) {
> --
> 2.45.2.803.g4e1b14247a-goog
>