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Message-ID: <0111c4b3-174b-84cb-2749-a88342b80498@oracle.com>
Date: Fri, 11 Aug 2023 16:51:08 +0100
From: John Garry <john.g.garry@...cle.com>
To: Ian Rogers <irogers@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Ravi Bangoria <ravi.bangoria@....com>,
Kajol Jain <kjain@...ux.ibm.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] perf pmus: Add scan that ignores duplicates, use
for perf list
On 10/08/2023 22:49, Ian Rogers wrote:
> When there are multiple PMUs that differ only by suffix, by default
> just list the first one and skip all others. As the PMUs are sorted,
> the scan routine checks that the PMU names match and the numbers are
> consecutive. If "-v" is passed to "perf list" then list all PMUs.
I really think that this should be merged with the next change. I don't
like the intermediate step of by default only printing the first PMU.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/builtin-list.c | 8 +++++
> tools/perf/util/pmus.c | 54 ++++++++++++++++++++++++++++++++--
> tools/perf/util/print-events.h | 1 +
> 3 files changed, 61 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
> index 7fec2cca759f..8fe4ddf02c14 100644
> --- a/tools/perf/builtin-list.c
> +++ b/tools/perf/builtin-list.c
> @@ -423,6 +423,13 @@ static void json_print_metric(void *ps __maybe_unused, const char *group,
> strbuf_release(&buf);
> }
>
> +static bool default_skip_duplicate_pmus(void *ps)
> +{
> + struct print_state *print_state = ps;
> +
> + return !print_state->long_desc;
> +}
> +
> int cmd_list(int argc, const char **argv)
> {
> int i, ret = 0;
> @@ -434,6 +441,7 @@ int cmd_list(int argc, const char **argv)
> .print_end = default_print_end,
> .print_event = default_print_event,
> .print_metric = default_print_metric,
> + .skip_duplicate_pmus = default_skip_duplicate_pmus,
> };
> const char *cputype = NULL;
> const char *unit_name = NULL;
> diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
> index 3581710667b0..5073843aca19 100644
> --- a/tools/perf/util/pmus.c
> +++ b/tools/perf/util/pmus.c
> @@ -275,6 +275,50 @@ struct perf_pmu *perf_pmus__scan_core(struct perf_pmu *pmu)
> return NULL;
> }
>
> +static struct perf_pmu *perf_pmus__scan_skip_duplicates(struct perf_pmu *pmu)
> +{
> + bool use_core_pmus = !pmu || pmu->is_core;
> + int last_pmu_name_len = 0;
> + unsigned long last_pmu_num = 0;
> + const char *last_pmu_name = (pmu && pmu->name) ? pmu->name : "";
> +
> + if (!pmu) {
> + pmu_read_sysfs(/*core_only=*/false);
> + pmu = list_prepare_entry(pmu, &core_pmus, list);
> + } else
> + last_pmu_name_len = pmu_name_len_no_suffix(pmu->name ?: "", &last_pmu_num);
> +
> + if (use_core_pmus) {
> + list_for_each_entry_continue(pmu, &core_pmus, list) {
> + unsigned long pmu_num = 0;
> + int pmu_name_len = pmu_name_len_no_suffix(pmu->name ?: "", &pmu_num);
> +
> + if (last_pmu_name_len == pmu_name_len &&
> + (last_pmu_num + 1 == pmu_num) &&
> + !strncmp(last_pmu_name, pmu->name ?: "", pmu_name_len)) {
> + last_pmu_num++;
> + continue;
> + }
> + return pmu;
> + }
> + pmu = NULL;
you assign pmu NULL
> + pmu = list_prepare_entry(pmu, &other_pmus, list);
and then re-assign it. If list_prepare_entry() needs first arg = NULL,
then can just use NULL explicitly?
> + }
> + list_for_each_entry_continue(pmu, &other_pmus, list) {
> + unsigned long pmu_num = 0;
> + int pmu_name_len = pmu_name_len_no_suffix(pmu->name ?: "", &pmu_num);
> +
> + if (last_pmu_name_len == pmu_name_len &&
> + (last_pmu_num + 1 == pmu_num) &&
> + !strncmp(last_pmu_name, pmu->name ?: "", pmu_name_len)) {
> + last_pmu_num++;
> + continue;
Can some of this code be factored out from the previous patch? It's
doing something similar, right?
> + }
> + return pmu;
> + }
> + return NULL;
> +}
> +
> const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str)
> {
> struct perf_pmu *pmu = NULL;
> @@ -429,10 +473,16 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
> int printed = 0;
> int len, j;
> struct sevent *aliases;
> + struct perf_pmu *(*scan_fn)(struct perf_pmu *);
> +
> + if (print_cb->skip_duplicate_pmus(print_state))
> + scan_fn = perf_pmus__scan_skip_duplicates;
> + else
> + scan_fn = perf_pmus__scan;
>
> pmu = NULL;
> len = 0;
> - while ((pmu = perf_pmus__scan(pmu)) != NULL) {
> + while ((pmu = scan_fn(pmu)) != NULL) {
> list_for_each_entry(event, &pmu->aliases, list)
> len++;
> if (pmu->selectable)
> @@ -445,7 +495,7 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
> }
> pmu = NULL;
> j = 0;
> - while ((pmu = perf_pmus__scan(pmu)) != NULL) {
> + while ((pmu = scan_fn(pmu)) != NULL) {
> bool is_cpu = pmu->is_core;
>
> list_for_each_entry(event, &pmu->aliases, list) {
> diff --git a/tools/perf/util/print-events.h b/tools/perf/util/print-events.h
> index d7fab411e75c..bf4290bef0cd 100644
> --- a/tools/perf/util/print-events.h
> +++ b/tools/perf/util/print-events.h
> @@ -26,6 +26,7 @@ struct print_callbacks {
> const char *expr,
> const char *threshold,
> const char *unit);
> + bool (*skip_duplicate_pmus)(void *print_state);
> };
>
> /** Print all events, the default when no options are specified. */
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