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Message-ID: <CAM9d7chPqFGEih7z7rp=eS5P30gSMvG=6fi=0QqT=EdfdMOH_A@mail.gmail.com>
Date: Fri, 16 Feb 2024 17:01:45 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: 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>,
Adrian Hunter <adrian.hunter@...el.com>, Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@....com>,
John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>, Darren Hart <dvhart@...radead.org>,
Davidlohr Bueso <dave@...olabs.net>, André Almeida <andrealmeid@...lia.com>,
Kan Liang <kan.liang@...ux.intel.com>, K Prateek Nayak <kprateek.nayak@....com>,
Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>,
Kajol Jain <kjain@...ux.ibm.com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
Andrew Jones <ajones@...tanamicro.com>, Alexandre Ghiti <alexghiti@...osinc.com>,
Atish Patra <atishp@...osinc.com>, "Steinar H. Gunderson" <sesse@...gle.com>,
Yang Jihong <yangjihong1@...wei.com>, Yang Li <yang.lee@...ux.alibaba.com>,
Changbin Du <changbin.du@...wei.com>, Sandipan Das <sandipan.das@....com>,
Ravi Bangoria <ravi.bangoria@....com>, Paran Lee <p4ranlee@...il.com>,
Nick Desaulniers <ndesaulniers@...gle.com>, Huacai Chen <chenhuacai@...nel.org>,
Yanteng Si <siyanteng@...ngson.cn>, linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org, coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org, bpf@...r.kernel.org,
Leo Yan <leo.yan@...ux.dev>
Subject: Re: [PATCH v3 3/8] perf arm-spe/cs-etm: Directly iterate CPU maps
On Fri, Feb 2, 2024 at 3:41 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Rather than iterate all CPUs and see if they are in CPU maps, directly
> iterate the CPU map. Similarly make use of the intersect function
> taking care for when "any" CPU is specified. Switch
> perf_cpu_map__has_any_cpu_or_is_empty to more appropriate
> alternatives.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/arch/arm/util/cs-etm.c | 114 ++++++++++++---------------
> tools/perf/arch/arm64/util/arm-spe.c | 4 +-
> 2 files changed, 51 insertions(+), 67 deletions(-)
>
> diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
> index 77e6663c1703..07be32d99805 100644
> --- a/tools/perf/arch/arm/util/cs-etm.c
> +++ b/tools/perf/arch/arm/util/cs-etm.c
> @@ -197,38 +197,37 @@ static int cs_etm_validate_timestamp(struct auxtrace_record *itr,
> static int cs_etm_validate_config(struct auxtrace_record *itr,
> struct evsel *evsel)
> {
> - int i, err = -EINVAL;
> + int idx, err = 0;
> struct perf_cpu_map *event_cpus = evsel->evlist->core.user_requested_cpus;
> - struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus();
> -
> - /* Set option of each CPU we have */
> - for (i = 0; i < cpu__max_cpu().cpu; i++) {
> - struct perf_cpu cpu = { .cpu = i, };
> + struct perf_cpu_map *intersect_cpus;
> + struct perf_cpu cpu;
>
> - /*
> - * In per-cpu case, do the validation for CPUs to work with.
> - * In per-thread case, the CPU map is empty. Since the traced
> - * program can run on any CPUs in this case, thus don't skip
> - * validation.
> - */
> - if (!perf_cpu_map__has_any_cpu_or_is_empty(event_cpus) &&
> - !perf_cpu_map__has(event_cpus, cpu))
> - continue;
> + /*
> + * Set option of each CPU we have. In per-cpu case, do the validation
> + * for CPUs to work with. In per-thread case, the CPU map has the "any"
> + * CPU value. Since the traced program can run on any CPUs in this case,
> + * thus don't skip validation.
> + */
> + if (!perf_cpu_map__has_any_cpu(event_cpus)) {
> + struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus();
>
> - if (!perf_cpu_map__has(online_cpus, cpu))
> - continue;
> + intersect_cpus = perf_cpu_map__intersect(event_cpus, online_cpus);
> + perf_cpu_map__put(online_cpus);
> + } else {
> + intersect_cpus = perf_cpu_map__new_online_cpus();
> + }
Would it be ok if any of these operations fail? I believe the
cpu map functions work well with NULL already.
Thanks,
Namhyung
>
> - err = cs_etm_validate_context_id(itr, evsel, i);
> + perf_cpu_map__for_each_cpu_skip_any(cpu, idx, intersect_cpus) {
> + err = cs_etm_validate_context_id(itr, evsel, cpu.cpu);
> if (err)
> - goto out;
> - err = cs_etm_validate_timestamp(itr, evsel, i);
> + break;
> +
> + err = cs_etm_validate_timestamp(itr, evsel, cpu.cpu);
> if (err)
> - goto out;
> + break;
> }
>
> - err = 0;
> -out:
> - perf_cpu_map__put(online_cpus);
> + perf_cpu_map__put(intersect_cpus);
> return err;
> }
>
> @@ -435,7 +434,7 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
> * Also the case of per-cpu mmaps, need the contextID in order to be notified
> * when a context switch happened.
> */
> - if (!perf_cpu_map__has_any_cpu_or_is_empty(cpus)) {
> + if (!perf_cpu_map__is_any_cpu_or_is_empty(cpus)) {
> evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel,
> "timestamp", 1);
> evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel,
> @@ -461,7 +460,7 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
> evsel->core.attr.sample_period = 1;
>
> /* In per-cpu case, always need the time of mmap events etc */
> - if (!perf_cpu_map__has_any_cpu_or_is_empty(cpus))
> + if (!perf_cpu_map__is_any_cpu_or_is_empty(cpus))
> evsel__set_sample_bit(evsel, TIME);
>
> err = cs_etm_validate_config(itr, cs_etm_evsel);
> @@ -533,45 +532,31 @@ static size_t
> cs_etm_info_priv_size(struct auxtrace_record *itr __maybe_unused,
> struct evlist *evlist __maybe_unused)
> {
> - int i;
> + int idx;
> int etmv3 = 0, etmv4 = 0, ete = 0;
> struct perf_cpu_map *event_cpus = evlist->core.user_requested_cpus;
> - struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus();
> -
> - /* cpu map is not empty, we have specific CPUs to work with */
> - if (!perf_cpu_map__has_any_cpu_or_is_empty(event_cpus)) {
> - for (i = 0; i < cpu__max_cpu().cpu; i++) {
> - struct perf_cpu cpu = { .cpu = i, };
> + struct perf_cpu_map *intersect_cpus;
> + struct perf_cpu cpu;
>
> - if (!perf_cpu_map__has(event_cpus, cpu) ||
> - !perf_cpu_map__has(online_cpus, cpu))
> - continue;
> + if (!perf_cpu_map__has_any_cpu(event_cpus)) {
> + /* cpu map is not "any" CPU , we have specific CPUs to work with */
> + struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus();
>
> - if (cs_etm_is_ete(itr, i))
> - ete++;
> - else if (cs_etm_is_etmv4(itr, i))
> - etmv4++;
> - else
> - etmv3++;
> - }
> + intersect_cpus = perf_cpu_map__intersect(event_cpus, online_cpus);
> + perf_cpu_map__put(online_cpus);
> } else {
> - /* get configuration for all CPUs in the system */
> - for (i = 0; i < cpu__max_cpu().cpu; i++) {
> - struct perf_cpu cpu = { .cpu = i, };
> -
> - if (!perf_cpu_map__has(online_cpus, cpu))
> - continue;
> -
> - if (cs_etm_is_ete(itr, i))
> - ete++;
> - else if (cs_etm_is_etmv4(itr, i))
> - etmv4++;
> - else
> - etmv3++;
> - }
> + /* Event can be "any" CPU so count all online CPUs. */
> + intersect_cpus = perf_cpu_map__new_online_cpus();
> }
> -
> - perf_cpu_map__put(online_cpus);
> + perf_cpu_map__for_each_cpu_skip_any(cpu, idx, intersect_cpus) {
> + if (cs_etm_is_ete(itr, cpu.cpu))
> + ete++;
> + else if (cs_etm_is_etmv4(itr, cpu.cpu))
> + etmv4++;
> + else
> + etmv3++;
> + }
> + perf_cpu_map__put(intersect_cpus);
>
> return (CS_ETM_HEADER_SIZE +
> (ete * CS_ETE_PRIV_SIZE) +
> @@ -813,16 +798,15 @@ static int cs_etm_info_fill(struct auxtrace_record *itr,
> if (!session->evlist->core.nr_mmaps)
> return -EINVAL;
>
> - /* If the cpu_map is empty all online CPUs are involved */
> - if (perf_cpu_map__has_any_cpu_or_is_empty(event_cpus)) {
> + /* If the cpu_map has the "any" CPU all online CPUs are involved */
> + if (perf_cpu_map__has_any_cpu(event_cpus)) {
> cpu_map = online_cpus;
> } else {
> /* Make sure all specified CPUs are online */
> - for (i = 0; i < perf_cpu_map__nr(event_cpus); i++) {
> - struct perf_cpu cpu = { .cpu = i, };
> + struct perf_cpu cpu;
>
> - if (perf_cpu_map__has(event_cpus, cpu) &&
> - !perf_cpu_map__has(online_cpus, cpu))
> + perf_cpu_map__for_each_cpu(cpu, i, event_cpus) {
> + if (!perf_cpu_map__has(online_cpus, cpu))
> return -EINVAL;
> }
>
> diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c
> index 51ccbfd3d246..0b52e67edb3b 100644
> --- a/tools/perf/arch/arm64/util/arm-spe.c
> +++ b/tools/perf/arch/arm64/util/arm-spe.c
> @@ -232,7 +232,7 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
> * In the case of per-cpu mmaps, sample CPU for AUX event;
> * also enable the timestamp tracing for samples correlation.
> */
> - if (!perf_cpu_map__has_any_cpu_or_is_empty(cpus)) {
> + if (!perf_cpu_map__is_any_cpu_or_is_empty(cpus)) {
> evsel__set_sample_bit(arm_spe_evsel, CPU);
> evsel__set_config_if_unset(arm_spe_pmu, arm_spe_evsel,
> "ts_enable", 1);
> @@ -265,7 +265,7 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
> tracking_evsel->core.attr.sample_period = 1;
>
> /* In per-cpu case, always need the time of mmap events etc */
> - if (!perf_cpu_map__has_any_cpu_or_is_empty(cpus)) {
> + if (!perf_cpu_map__is_any_cpu_or_is_empty(cpus)) {
> evsel__set_sample_bit(tracking_evsel, TIME);
> evsel__set_sample_bit(tracking_evsel, CPU);
>
> --
> 2.43.0.594.gd9cf4e227d-goog
>
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