Re: [PATCH v3 10/10] perf list: Add json output option

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Wed, Nov 16, 2022 at 11:52:39AM -0800, Ian Rogers escreveu:
> On Wed, Nov 16, 2022 at 7:21 AM Arnaldo Carvalho de Melo
> <acme@kernel.org> wrote:
> >
> > Em Wed, Nov 16, 2022 at 10:10:53AM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Wed, Nov 16, 2022 at 09:41:43AM -0300, Arnaldo Carvalho de Melo escreveu:
> > > > But then:
> > >
> > > > [root@five ~]# perf list syscalls:sys_enter_open* |& grep syscalls:
> > > >   syscalls:sys_enter_open                            [Tracepoint event]
> > > >   syscalls:sys_enter_open_by_handle_at               [Tracepoint event]
> > > >   syscalls:sys_enter_open_tree                       [Tracepoint event]
> > > >   syscalls:sys_enter_openat                          [Tracepoint event]
> > > >   syscalls:sys_enter_openat2                         [Tracepoint event]
> > > > [root@five ~]#
> > > >
> > > > This stops working, looking into it.
> > >
> > > Sidetracked with other stuff, please find what I have patched at
> > > perf/perf-list-json-output in my tree.
> > >
> > > I removed the last two patches and I'm testing so that I can push
> > > perf/core with your series modulo the last two + Namhyung's 'perf list'
> > > kit.
> >
> > I just saw you sent a patch on top of the previous one, will try and
> > combine stuff to remove failures from the bisect history.
> >
> > - Arnaldo
> 
> So the failing test was skipping for me due to a lack of kernel
> symbols, sorry for not spotting it. I find that the issue is resolved
> with your fixes and:
> 
> ```
> diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> index 30937e1dd82c..ad6cb5d2e1cc 100644
> --- a/tools/perf/builtin-list.c
> +++ b/tools/perf/builtin-list.c
> @@ -107,7 +107,7 @@ static void default_print_event(void *ps, const
> char *pmu_name, const char *topi
>        if (deprecated && !print_state->deprecated)
>                return;
> 
> -       if (print_state->pmu_glob && !strglobmatch(pmu_name,
> print_state->pmu_glob))
> +       if (print_state->pmu_glob && pmu_name &&
> !strglobmatch(pmu_name, print_state->pmu_glob))
>                return;
> 
>        if (print_state->event_glob &&
> @@ -534,24 +534,18 @@ int cmd_list(int argc, const char **argv)
>                        default_ps.metrics = false;
>                        metricgroup__print(&print_cb, ps);
>                } else if ((sep = strchr(argv[i], ':')) != NULL) {
> -                       int sep_idx;
> -
> -                       sep_idx = sep - argv[i];
> -                       s = strdup(argv[i]);
> -                       if (s == NULL) {
> +                       default_ps.event_glob = strdup(argv[i]);
> +                       if (!default_ps.event_glob) {
>                                ret = -1;
>                                goto out;
>                        }
> -
> -                       s[sep_idx] = '\0';
> -                       default_ps.pmu_glob = s;
> -                       default_ps.event_glob = s + sep_idx + 1;
>                        print_tracepoint_events(&print_cb, ps);
>                        print_sdt_events(&print_cb, ps);
>                        default_ps.metrics = true;
>                        default_ps.metricgroups = true;
>                        metricgroup__print(&print_cb, ps);
> -                       free(s);
> +                       free(default_ps.event_glob);
> +                       default_ps.event_glob = NULL;
> ```
> I think this should be squashed into "perf list: Reorganize to use
> callbacks". Some explanation, in porting the : glob case I'd assumed
> the before the colon would be the PMU and the after the event. Doing
> things caused tracepoint output to differ too much and so for
> tracepoints the : is kept in the event name. So we can simplify the
> matching to not be pmu and event, just use the event glob.

Next time please send the patch, I did it manually and before the last
option I get:

[root@quaco ~]# perf list syscalls:sys_enter_open |& grep syscalls
  syscalls:sys_enter_open                            [Tracepoint event]
[root@quaco ~]# perf test 112
112: Check open filename arg using perf trace + vfs_getname          : Ok
[root@quaco ~]#

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 0c84fdb3ad37c1ad..7b63bc30665a7f56 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -19,6 +19,7 @@
 #include "util/strlist.h"
 #include <subcmd/pager.h>
 #include <subcmd/parse-options.h>
+#include <linux/zalloc.h>
 #include <stdio.h>
 
 /**
@@ -328,25 +329,20 @@ int cmd_list(int argc, const char **argv)
 			ps.metrics = false;
 			metricgroup__print(&print_cb, &ps);
 		} else if ((sep = strchr(argv[i], ':')) != NULL) {
-			int sep_idx;
 			char *old_pmu_glob = ps.pmu_glob;
 
-			sep_idx = sep - argv[i];
-			s = strdup(argv[i]);
-			if (s == NULL) {
+			ps.event_glob = strdup(argv[i]);
+			if (!ps.event_glob) {
 				ret = -1;
 				goto out;
 			}
 
-			s[sep_idx] = '\0';
-			ps.pmu_glob = s;
-			ps.event_glob = s + sep_idx + 1;
 			print_tracepoint_events(&print_cb, &ps);
 			print_sdt_events(&print_cb, &ps);
 			ps.metrics = true;
 			ps.metricgroups = true;
 			metricgroup__print(&print_cb, &ps);
-			free(s);
+			zfree(&ps.event_glob);
 			ps.pmu_glob = old_pmu_glob;
 		} else {
 			if (asprintf(&s, "*%s*", argv[i]) < 0) {