Re: [PATCH] perf list: Fix the --no-desc option

From: Breno Leitao
Date: Mon May 13 2024 - 16:45:19 EST


On Mon, May 13, 2024 at 10:13:01AM -0700, Ian Rogers wrote:
> On Mon, May 13, 2024 at 10:08 AM Breno Leitao <leitao@xxxxxxxxxx> wrote:
> > On Sat, May 11, 2024 at 02:25:53PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Thanks for asking the question, I'm dropping the patch, Breno, can you
> > > try again?
> >
> > Sure, let me think about it and send a v2.
>
> Thanks Breno! My bug, thanks for digging into this.

How about something like this:

Author: Breno Leitao <leitao@xxxxxxxxxx>
Date: Wed May 8 06:35:17 2024 -0700

perf list: Fix the --no-desc option

Currently, the --no-desc option in perf list isn't functioning as
intended.

This issue arises from the overwriting of struct option->desc with the
opposite value of struct option->long_desc. Consequently, whatever
parse_options() returns at struct option->desc gets overridden later,
rendering the --desc or --no-desc arguments ineffective.

To resolve this, set ->desc as true by default and allow parse_options()
to adjust it accordingly. This adjustment will fix the --no-desc
option while preserving the functionality of the other parameters.

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index e27a1b1288c2..16186acdd301 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -149,7 +149,11 @@ static void default_print_event(void *ps, const char *pmu_name, const char *topi
} else
fputc('\n', fp);

- if (desc && print_state->desc) {
+ if (long_desc && print_state->long_desc) {
+ fprintf(fp, "%*s", 8, "[");
+ wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
+ fprintf(fp, "]\n");
+ } else if (desc && print_state->desc) {
char *desc_with_unit = NULL;
int desc_len = -1;

@@ -165,12 +169,6 @@ static void default_print_event(void *ps, const char *pmu_name, const char *topi
fprintf(fp, "]\n");
free(desc_with_unit);
}
- long_desc = long_desc ?: desc;
- if (long_desc && print_state->long_desc) {
- fprintf(fp, "%*s", 8, "[");
- wordwrap(fp, long_desc, 8, pager_get_columns(), 0);
- fprintf(fp, "]\n");
- }

if (print_state->detailed && encoding_desc) {
fprintf(fp, "%*s", 8, "");
@@ -484,6 +482,7 @@ int cmd_list(int argc, const char **argv)
int i, ret = 0;
struct print_state default_ps = {
.fp = stdout,
+ .desc = true,
};
struct print_state json_ps = {
.fp = stdout,
@@ -556,7 +555,6 @@ int cmd_list(int argc, const char **argv)
};
ps = &json_ps;
} else {
- default_ps.desc = !default_ps.long_desc;
default_ps.last_topic = strdup("");
assert(default_ps.last_topic);
default_ps.visited_metrics = strlist__new(NULL, NULL);