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Message-ID: <febefab7-7351-4bd5-a6cc-a0116248484f@linux.intel.com>
Date: Thu, 18 Jul 2024 10:41:32 -0400
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Ian Rogers <irogers@...gle.com>, Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...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>,
Bjorn Helgaas <bhelgaas@...gle.com>, Jonathan Corbet <corbet@....net>,
James Clark <james.clark@....com>, Ravi Bangoria <ravi.bangoria@....com>,
Dominique Martinet <asmadeus@...ewreck.org>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org,
Dhananjay Ugwekar <Dhananjay.Ugwekar@....com>, ananth.narayan@....com,
gautham.shenoy@....com, kprateek.nayak@....com, sandipan.das@....com
Subject: Re: [PATCH v2 6/6] perf parse-events: Add "cpu" term to set the CPU
an event is recorded on
On 2024-07-17 8:30 p.m., Ian Rogers wrote:
> The -C option allows the CPUs for a list of events to be specified but
> its not possible to set the CPU for a single event. Add a term to
> allow this. The term isn't a general CPU list due to ',' already being
> a special character in event parsing instead multiple cpu= terms may
> be provided and they will be merged/unioned together.
>
> An example of mixing different types of events counted on different CPUs:
> ```
> $ perf stat -A -C 0,4-5,8 -e "instructions/cpu=0/,l1d-misses/cpu=4,cpu=5/,inst_retired.any/cpu=8/,cycles" -a sleep 0.1
>
> Performance counter stats for 'system wide':
>
> CPU0 368,647 instructions/cpu=0/ # 0.26 insn per cycle
> CPU4 <not counted> instructions/cpu=0/
> CPU5 <not counted> instructions/cpu=0/
> CPU8 <not counted> instructions/cpu=0/
> CPU0 <not counted> l1d-misses [cpu]
> CPU4 203,377 l1d-misses [cpu]
> CPU5 138,231 l1d-misses [cpu]
> CPU8 <not counted> l1d-misses [cpu]
> CPU0 <not counted> cpu/cpu=8/
> CPU4 <not counted> cpu/cpu=8/
> CPU5 <not counted> cpu/cpu=8/
> CPU8 943,861 cpu/cpu=8/
> CPU0 1,412,071 cycles
> CPU4 20,362,900 cycles
> CPU5 10,172,725 cycles
> CPU8 2,406,081 cycles
>
> 0.102925309 seconds time elapsed
> ```
>
> Note, the event name of inst_retired.any is missing, reported as
> cpu/cpu=8/, as there are unmerged uniquify fixes:
> https://lore.kernel.org/lkml/20240510053705.2462258-3-irogers@google.com/
>
> An example of spreading uncore overhead across two CPUs:
> ```
> $ perf stat -A -e "data_read/cpu=0/,data_write/cpu=1/" -a sleep 0.1
>
> Performance counter stats for 'system wide':
>
> CPU0 223.65 MiB uncore_imc_free_running_0/cpu=0/
> CPU0 223.66 MiB uncore_imc_free_running_1/cpu=0/
> CPU0 <not counted> MiB uncore_imc_free_running_0/cpu=1/
> CPU1 5.78 MiB uncore_imc_free_running_0/cpu=1/
> CPU0 <not counted> MiB uncore_imc_free_running_1/cpu=1/
> CPU1 5.74 MiB uncore_imc_free_running_1/cpu=1/
> ```
>
> Manually fixing the output it should be:
> ```
> CPU0 223.65 MiB uncore_imc_free_running_0/data_read,cpu=0/
> CPU0 223.66 MiB uncore_imc_free_running_1/data_read,cpu=0/
> CPU1 5.78 MiB uncore_imc_free_running_0/data_write,cpu=1/
> CPU1 5.74 MiB uncore_imc_free_running_1/data_write,cpu=1/
> ```
>
> That is data_read from 2 PMUs was counted on CPU0 and data_write was
> counted on CPU1.
There was an effort to make the counter access from any CPU of the package.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d6a2f9035bfc27d0e9d78b13635dda9fb017ac01
But now it limits the access from specific CPUs. It sounds like a
regression.
Thanks,
Kan
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/Documentation/perf-list.txt | 9 ++++
> tools/perf/util/evsel_config.h | 1 +
> tools/perf/util/parse-events.c | 73 ++++++++++++++++++++++----
> tools/perf/util/parse-events.h | 3 +-
> tools/perf/util/parse-events.l | 1 +
> tools/perf/util/pmu.c | 1 +
> 6 files changed, 77 insertions(+), 11 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
> index 6bf2468f59d3..15511afe94a1 100644
> --- a/tools/perf/Documentation/perf-list.txt
> +++ b/tools/perf/Documentation/perf-list.txt
> @@ -273,6 +273,15 @@ Sums up the event counts for all hardware threads in a core, e.g.:
>
> perf stat -e cpu/event=0,umask=0x3,percore=1/
>
> +cpu:
> +
> +Specifies the CPU to open the event upon. The value may be repeated to
> +specify opening the event on multiple CPUs:
> +
> +
> + perf stat -e instructions/cpu=0,cpu=2/,cycles/cpu=1,cpu=2/ -a sleep 1
> + perf stat -e data_read/cpu=0/,data_write/cpu=1/ -a sleep 1
> +
>
> EVENT GROUPS
> ------------
> diff --git a/tools/perf/util/evsel_config.h b/tools/perf/util/evsel_config.h
> index aee6f808b512..9630c4a24721 100644
> --- a/tools/perf/util/evsel_config.h
> +++ b/tools/perf/util/evsel_config.h
> @@ -47,6 +47,7 @@ struct evsel_config_term {
> u32 aux_sample_size;
> u64 cfg_chg;
> char *str;
> + int cpu;
> } val;
> bool weak;
> };
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 8c0c33361c5e..85faef85b8de 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -7,6 +7,7 @@
> #include <errno.h>
> #include <sys/ioctl.h>
> #include <sys/param.h>
> +#include "cpumap.h"
> #include "term.h"
> #include "evlist.h"
> #include "evsel.h"
> @@ -177,6 +178,26 @@ static char *get_config_name(const struct parse_events_terms *head_terms)
> return get_config_str(head_terms, PARSE_EVENTS__TERM_TYPE_NAME);
> }
>
> +static struct perf_cpu_map *get_config_cpu(const struct parse_events_terms *head_terms)
> +{
> + struct parse_events_term *term;
> + struct perf_cpu_map *cpus = NULL;
> +
> + if (!head_terms)
> + return NULL;
> +
> + list_for_each_entry(term, &head_terms->terms, list) {
> + if (term->type_term == PARSE_EVENTS__TERM_TYPE_CPU) {
> + struct perf_cpu_map *cpu = perf_cpu_map__new_int(term->val.num);
> +
> + cpus = perf_cpu_map__merge(cpus, cpu);
> + perf_cpu_map__put(cpu);
> + }
> + }
> +
> + return cpus;
> +}
> +
> /**
> * fix_raw - For each raw term see if there is an event (aka alias) in pmu that
> * matches the raw's string value. If the string value matches an
> @@ -468,11 +489,12 @@ int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
> bool found_supported = false;
> const char *config_name = get_config_name(parsed_terms);
> const char *metric_id = get_config_metric_id(parsed_terms);
> + struct perf_cpu_map *cpus = get_config_cpu(parsed_terms);
> + int ret = 0;
>
> while ((pmu = perf_pmus__scan(pmu)) != NULL) {
> LIST_HEAD(config_terms);
> struct perf_event_attr attr;
> - int ret;
>
> if (parse_events__filter_pmu(parse_state, pmu))
> continue;
> @@ -486,7 +508,7 @@ int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
> parsed_terms,
> perf_pmu__auto_merge_stats(pmu));
> if (ret)
> - return ret;
> + goto out_err;
> continue;
> }
>
> @@ -506,20 +528,27 @@ int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
>
> if (parsed_terms) {
> if (config_attr(&attr, parsed_terms, parse_state->error,
> - config_term_common))
> - return -EINVAL;
> -
> - if (get_config_terms(parsed_terms, &config_terms))
> - return -ENOMEM;
> + config_term_common)) {
> + ret = -EINVAL;
> + goto out_err;
> + }
> + if (get_config_terms(parsed_terms, &config_terms)) {
> + ret = -ENOMEM;
> + goto out_err;
> + }
> }
>
> if (__add_event(list, idx, &attr, /*init_attr*/true, config_name ?: name,
> metric_id, pmu, &config_terms, /*auto_merge_stats=*/false,
> - /*cpu_list=*/NULL) == NULL)
> - return -ENOMEM;
> + cpus) == NULL)
> + ret = -ENOMEM;
>
> free_config_terms(&config_terms);
> + if (ret)
> + goto out_err;
> }
> +out_err:
> + perf_cpu_map__put(cpus);
> return found_supported ? 0 : -EINVAL;
> }
>
> @@ -814,6 +843,7 @@ static const char *config_term_name(enum parse_events__term_type term_type)
> [PARSE_EVENTS__TERM_TYPE_RAW] = "raw",
> [PARSE_EVENTS__TERM_TYPE_LEGACY_CACHE] = "legacy-cache",
> [PARSE_EVENTS__TERM_TYPE_HARDWARE] = "hardware",
> + [PARSE_EVENTS__TERM_TYPE_CPU] = "cpu",
> };
> if ((unsigned int)term_type >= __PARSE_EVENTS__TERM_TYPE_NR)
> return "unknown term";
> @@ -843,6 +873,7 @@ config_term_avail(enum parse_events__term_type term_type, struct parse_events_er
> case PARSE_EVENTS__TERM_TYPE_METRIC_ID:
> case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
> case PARSE_EVENTS__TERM_TYPE_PERCORE:
> + case PARSE_EVENTS__TERM_TYPE_CPU:
> return true;
> case PARSE_EVENTS__TERM_TYPE_USER:
> case PARSE_EVENTS__TERM_TYPE_SAMPLE_FREQ:
> @@ -986,6 +1017,15 @@ do { \
> return -EINVAL;
> }
> break;
> + case PARSE_EVENTS__TERM_TYPE_CPU:
> + CHECK_TYPE_VAL(NUM);
> + if (term->val.num >= (u64)cpu__max_present_cpu().cpu) {
> + parse_events_error__handle(err, term->err_val,
> + strdup("too big"),
> + NULL);
> + return -EINVAL;
> + }
> + break;
> case PARSE_EVENTS__TERM_TYPE_DRV_CFG:
> case PARSE_EVENTS__TERM_TYPE_USER:
> case PARSE_EVENTS__TERM_TYPE_LEGACY_CACHE:
> @@ -1112,6 +1152,7 @@ static int config_term_tracepoint(struct perf_event_attr *attr,
> case PARSE_EVENTS__TERM_TYPE_RAW:
> case PARSE_EVENTS__TERM_TYPE_LEGACY_CACHE:
> case PARSE_EVENTS__TERM_TYPE_HARDWARE:
> + case PARSE_EVENTS__TERM_TYPE_CPU:
> default:
> if (err) {
> parse_events_error__handle(err, term->err_term,
> @@ -1243,6 +1284,7 @@ do { \
> case PARSE_EVENTS__TERM_TYPE_RAW:
> case PARSE_EVENTS__TERM_TYPE_LEGACY_CACHE:
> case PARSE_EVENTS__TERM_TYPE_HARDWARE:
> + case PARSE_EVENTS__TERM_TYPE_CPU:
> default:
> break;
> }
> @@ -1296,6 +1338,7 @@ static int get_config_chgs(struct perf_pmu *pmu, struct parse_events_terms *head
> case PARSE_EVENTS__TERM_TYPE_RAW:
> case PARSE_EVENTS__TERM_TYPE_LEGACY_CACHE:
> case PARSE_EVENTS__TERM_TYPE_HARDWARE:
> + case PARSE_EVENTS__TERM_TYPE_CPU:
> default:
> break;
> }
> @@ -1350,6 +1393,7 @@ static int __parse_events_add_numeric(struct parse_events_state *parse_state,
> struct perf_event_attr attr;
> LIST_HEAD(config_terms);
> const char *name, *metric_id;
> + struct perf_cpu_map *cpus;
> int ret;
>
> memset(&attr, 0, sizeof(attr));
> @@ -1371,9 +1415,11 @@ static int __parse_events_add_numeric(struct parse_events_state *parse_state,
>
> name = get_config_name(head_config);
> metric_id = get_config_metric_id(head_config);
> + cpus = get_config_cpu(head_config);
> ret = __add_event(list, &parse_state->idx, &attr, /*init_attr*/true, name,
> metric_id, pmu, &config_terms, /*auto_merge_stats=*/false,
> - /*cpu_list=*/NULL) ? 0 : -ENOMEM;
> + cpus) ? 0 : -ENOMEM;
> + perf_cpu_map__put(cpus);
> free_config_terms(&config_terms);
> return ret;
> }
> @@ -1440,6 +1486,7 @@ static int parse_events_add_pmu(struct parse_events_state *parse_state,
> LIST_HEAD(config_terms);
> struct parse_events_terms parsed_terms;
> bool alias_rewrote_terms = false;
> + struct perf_cpu_map *term_cpu = NULL;
> int ret = 0;
>
> if (verbose > 1) {
> @@ -1531,6 +1578,12 @@ static int parse_events_add_pmu(struct parse_events_state *parse_state,
> goto out_err;
> }
>
> + term_cpu = get_config_cpu(&parsed_terms);
> + if (!perf_cpu_map__is_empty(term_cpu)) {
> + perf_cpu_map__put(info.cpus);
> + info.cpus = term_cpu;
> + term_cpu = NULL;
> + }
> evsel = __add_event(list, &parse_state->idx, &attr, /*init_attr=*/true,
> get_config_name(&parsed_terms),
> get_config_metric_id(&parsed_terms), pmu,
> diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> index e13de2c8b706..b03857499030 100644
> --- a/tools/perf/util/parse-events.h
> +++ b/tools/perf/util/parse-events.h
> @@ -79,7 +79,8 @@ enum parse_events__term_type {
> PARSE_EVENTS__TERM_TYPE_RAW,
> PARSE_EVENTS__TERM_TYPE_LEGACY_CACHE,
> PARSE_EVENTS__TERM_TYPE_HARDWARE,
> -#define __PARSE_EVENTS__TERM_TYPE_NR (PARSE_EVENTS__TERM_TYPE_HARDWARE + 1)
> + PARSE_EVENTS__TERM_TYPE_CPU,
> +#define __PARSE_EVENTS__TERM_TYPE_NR (PARSE_EVENTS__TERM_TYPE_CPU + 1)
> };
>
> struct parse_events_term {
> diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
> index 16045c383ada..e06097a62796 100644
> --- a/tools/perf/util/parse-events.l
> +++ b/tools/perf/util/parse-events.l
> @@ -330,6 +330,7 @@ percore { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_PERCORE); }
> aux-output { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_AUX_OUTPUT); }
> aux-sample-size { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_AUX_SAMPLE_SIZE); }
> metric-id { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_METRIC_ID); }
> +cpu { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_CPU); }
> cpu-cycles|cycles { return hw_term(yyscanner, PERF_COUNT_HW_CPU_CYCLES); }
> stalled-cycles-frontend|idle-cycles-frontend { return hw_term(yyscanner, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND); }
> stalled-cycles-backend|idle-cycles-backend { return hw_term(yyscanner, PERF_COUNT_HW_STALLED_CYCLES_BACKEND); }
> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
> index 280b2499c861..27e2ff23799e 100644
> --- a/tools/perf/util/pmu.c
> +++ b/tools/perf/util/pmu.c
> @@ -1767,6 +1767,7 @@ int perf_pmu__for_each_format(struct perf_pmu *pmu, void *state, pmu_format_call
> "percore",
> "aux-output",
> "aux-sample-size=number",
> + "cpu=number",
> };
> struct perf_pmu_format *format;
> int ret;
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