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Date: Fri, 12 Mar 2021 20:15:06 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Jin Yao <yao.jin@...ux.intel.com>
Cc: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, alexander.shishkin@...ux.intel.com,
Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v2 11/27] perf parse-events: Support hardware events
inside PMU
On Thu, Mar 11, 2021 at 03:07:26PM +0800, Jin Yao wrote:
> On hybrid platform, some hardware events are only available
> on a specific pmu. For example, 'L1-dcache-load-misses' is only
> available on 'cpu_core' pmu. And even for the event which can be
> available on both pmus, the user also may want to just enable
> one event. So now following syntax is supported:
>
> cpu_core/<hardware event>/
> cpu_core/<hardware cache event>/
> cpu_core/<pmu event>/
>
> cpu_atom/<hardware event>/
> cpu_atom/<hardware cache event>/
> cpu_atom/<pmu event>/
>
> It limits the event to be enabled only on a specified pmu.
>
> The patch uses this idea, for example, if we use "cpu_core/LLC-loads/",
> in parse_events_add_pmu(), term->config is "LLC-loads".
hum, I don't understand how this doest not work even now,
I assume both cpu_core and cpu_atom have sysfs device directory
with events/ directory right?
and whatever is defined in events we allow in parsing syntax..
why can't we treat them like 2 separated pmus?
thanks,
jirka
>
> We create a new "parse_events_state" with the pmu_name and use
> parse_events__scanner to scan the term->config (the string "LLC-loads"
> in this example). The parse_events_add_cache() will be called during
> parsing. The parse_state->pmu_name is used to identify the pmu
> where the event is enabled.
>
> Let's see examples:
>
> root@...-pwrt-002:~# ./perf stat -e cpu_core/cycles/,cpu_core/LLC-loads/ -vv -- ./triad_loop
> Control descriptor is not initialized
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0x400000000
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 7267 cpu -1 group_fd -1 flags 0x8 = 3
> ------------------------------------------------------------
> perf_event_attr:
> type 7
> size 120
> config 0x400000002
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 7267 cpu -1 group_fd -1 flags 0x8 = 4
> cycles: 0: 449252097 297999924 297999924
> LLC-loads: 0: 1857 297999924 297999924
> cycles: 449252097 297999924 297999924
> LLC-loads: 1857 297999924 297999924
>
> Performance counter stats for './triad_loop':
>
> 449,252,097 cpu_core/cycles/
> 1,857 cpu_core/LLC-loads/
>
> 0.298898415 seconds time elapsed
>
> root@...-pwrt-002:~# ./perf stat -e cpu_atom/cycles/,cpu_atom/LLC-loads/ -vv -- taskset -c 16 ./triad_loop
> Control descriptor is not initialized
> ------------------------------------------------------------
> perf_event_attr:
> type 6
> size 120
> config 0xa00000000
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 7339 cpu -1 group_fd -1 flags 0x8 = 3
> ------------------------------------------------------------
> perf_event_attr:
> type 7
> size 120
> config 0xa00000002
> sample_type IDENTIFIER
> read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
> disabled 1
> inherit 1
> enable_on_exec 1
> exclude_guest 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 7339 cpu -1 group_fd -1 flags 0x8 = 4
> cycles: 0: 602020010 343657939 342553275
> LLC-loads: 0: 3537 343657939 342553275
> cycles: 603961400 343657939 342553275
> LLC-loads: 3548 343657939 342553275
>
> Performance counter stats for 'taskset -c 16 ./triad_loop':
>
> 603,961,400 cpu_atom/cycles/ (99.68%)
> 3,548 cpu_atom/LLC-loads/ (99.68%)
>
> 0.344904585 seconds time elapsed
>
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
> tools/perf/util/parse-events.c | 100 +++++++++++++++++++++++++++++++--
> tools/perf/util/parse-events.h | 6 +-
> tools/perf/util/parse-events.y | 21 ++-----
> 3 files changed, 105 insertions(+), 22 deletions(-)
>
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 09e42245f71a..30435adc7a7b 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -489,7 +489,8 @@ static int create_hybrid_cache_event(struct list_head *list, int *idx,
> static int add_hybrid_cache(struct list_head *list, int *idx,
> struct perf_event_attr *attr, char *name,
> struct list_head *config_terms,
> - bool *hybrid)
> + bool *hybrid,
> + struct parse_events_state *parse_state)
> {
> struct perf_pmu *pmu;
> int ret;
> @@ -497,6 +498,11 @@ static int add_hybrid_cache(struct list_head *list, int *idx,
> *hybrid = false;
> perf_pmu__for_each_hybrid_pmu(pmu) {
> *hybrid = true;
> + if (parse_state->pmu_name &&
> + strcmp(parse_state->pmu_name, pmu->name)) {
> + continue;
> + }
> +
> ret = create_hybrid_cache_event(list, idx, attr, name,
> config_terms, pmu);
> if (ret)
> @@ -509,7 +515,8 @@ static int add_hybrid_cache(struct list_head *list, int *idx,
> int parse_events_add_cache(struct list_head *list, int *idx,
> char *type, char *op_result1, char *op_result2,
> struct parse_events_error *err,
> - struct list_head *head_config)
> + struct list_head *head_config,
> + struct parse_events_state *parse_state)
> {
> struct perf_event_attr attr;
> LIST_HEAD(config_terms);
> @@ -582,7 +589,7 @@ int parse_events_add_cache(struct list_head *list, int *idx,
> perf_pmu__scan(NULL);
>
> ret = add_hybrid_cache(list, idx, &attr, config_name ? : name,
> - &config_terms, &hybrid);
> + &config_terms, &hybrid, parse_state);
> if (hybrid)
> return ret;
>
> @@ -1512,6 +1519,11 @@ static int add_hybrid_numeric(struct parse_events_state *parse_state,
> *hybrid = false;
> perf_pmu__for_each_hybrid_pmu(pmu) {
> *hybrid = true;
> + if (parse_state->pmu_name &&
> + strcmp(parse_state->pmu_name, pmu->name)) {
> + continue;
> + }
> +
> ret = create_hybrid_hw_event(parse_state, list, attr, pmu);
> if (ret)
> return ret;
> @@ -1578,6 +1590,10 @@ static bool config_term_percore(struct list_head *config_terms)
> return false;
> }
>
> +static int parse_events_with_hybrid_pmu(struct parse_events_state *parse_state,
> + const char *str, char *name, bool *found,
> + struct list_head *list);
> +
> int parse_events_add_pmu(struct parse_events_state *parse_state,
> struct list_head *list, char *name,
> struct list_head *head_config,
> @@ -1589,7 +1605,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> struct perf_pmu *pmu;
> struct evsel *evsel;
> struct parse_events_error *err = parse_state->error;
> - bool use_uncore_alias;
> + bool use_uncore_alias, found;
> LIST_HEAD(config_terms);
>
> if (verbose > 1) {
> @@ -1605,6 +1621,22 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> fprintf(stderr, "' that may result in non-fatal errors\n");
> }
>
> + if (head_config && perf_pmu__is_hybrid(name)) {
> + struct parse_events_term *term;
> + int ret;
> +
> + list_for_each_entry(term, head_config, list) {
> + if (!term->config)
> + continue;
> + ret = parse_events_with_hybrid_pmu(parse_state,
> + term->config,
> + name, &found,
> + list);
> + if (found)
> + return ret;
> + }
> + }
> +
> pmu = parse_state->fake_pmu ?: perf_pmu__find(name);
> if (!pmu) {
> char *err_str;
> @@ -1713,12 +1745,19 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
> struct perf_pmu *pmu = NULL;
> int ok = 0;
>
> + if (parse_state->pmu_name) {
> + list = alloc_list();
> + if (!list)
> + return -1;
> + *listp = list;
> + return 0;
> + }
> +
> *listp = NULL;
> /* Add it for all PMUs that support the alias */
> - list = malloc(sizeof(struct list_head));
> + list = alloc_list();
> if (!list)
> return -1;
> - INIT_LIST_HEAD(list);
> while ((pmu = perf_pmu__scan(pmu)) != NULL) {
> struct perf_pmu_alias *alias;
>
> @@ -2284,6 +2323,44 @@ int parse_events_terms(struct list_head *terms, const char *str)
> return ret;
> }
>
> +static int list_num(struct list_head *list)
> +{
> + struct list_head *pos;
> + int n = 0;
> +
> + list_for_each(pos, list)
> + n++;
> +
> + return n;
> +}
> +
> +static int parse_events_with_hybrid_pmu(struct parse_events_state *parse_state,
> + const char *str, char *pmu_name,
> + bool *found, struct list_head *list)
> +{
> + struct parse_events_state ps = {
> + .list = LIST_HEAD_INIT(ps.list),
> + .stoken = PE_START_EVENTS,
> + .pmu_name = pmu_name,
> + .idx = parse_state->idx,
> + };
> + int ret;
> +
> + *found = false;
> + ret = parse_events__scanner(str, &ps);
> + perf_pmu__parse_cleanup();
> +
> + if (!ret) {
> + if (!list_empty(&ps.list)) {
> + *found = true;
> + list_splice(&ps.list, list);
> + parse_state->idx = list_num(list);
> + }
> + }
> +
> + return ret;
> +}
> +
> int __parse_events(struct evlist *evlist, const char *str,
> struct parse_events_error *err, struct perf_pmu *fake_pmu)
> {
> @@ -3307,3 +3384,14 @@ char *parse_events_formats_error_string(char *additional_terms)
> fail:
> return NULL;
> }
> +
> +struct list_head *alloc_list(void)
> +{
> + struct list_head *list = malloc(sizeof(*list));
> +
> + if (!list)
> + return NULL;
> +
> + INIT_LIST_HEAD(list);
> + return list;
> +}
> diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> index e80c9b74f2f2..39c7121a4659 100644
> --- a/tools/perf/util/parse-events.h
> +++ b/tools/perf/util/parse-events.h
> @@ -138,6 +138,7 @@ struct parse_events_state {
> struct list_head *terms;
> int stoken;
> struct perf_pmu *fake_pmu;
> + char *pmu_name;
> };
>
> void parse_events__handle_error(struct parse_events_error *err, int idx,
> @@ -188,7 +189,8 @@ int parse_events_add_tool(struct parse_events_state *parse_state,
> int parse_events_add_cache(struct list_head *list, int *idx,
> char *type, char *op_result1, char *op_result2,
> struct parse_events_error *error,
> - struct list_head *head_config);
> + struct list_head *head_config,
> + struct parse_events_state *parse_state);
> int parse_events_add_breakpoint(struct list_head *list, int *idx,
> u64 addr, char *type, u64 len);
> int parse_events_add_pmu(struct parse_events_state *parse_state,
> @@ -242,6 +244,8 @@ char *parse_events_formats_error_string(char *additional_terms);
> void parse_events_print_error(struct parse_events_error *err,
> const char *event);
>
> +struct list_head *alloc_list(void);
> +
> #ifdef HAVE_LIBELF_SUPPORT
> /*
> * If the probe point starts with '%',
> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> index d57ac86ce7ca..e0e68c3da9e4 100644
> --- a/tools/perf/util/parse-events.y
> +++ b/tools/perf/util/parse-events.y
> @@ -26,18 +26,6 @@ do { \
> YYABORT; \
> } while (0)
>
> -static struct list_head* alloc_list(void)
> -{
> - struct list_head *list;
> -
> - list = malloc(sizeof(*list));
> - if (!list)
> - return NULL;
> -
> - INIT_LIST_HEAD(list);
> - return list;
> -}
> -
> static void free_list_evsel(struct list_head* list_evsel)
> {
> struct evsel *evsel, *tmp;
> @@ -454,7 +442,8 @@ PE_NAME_CACHE_TYPE '-' PE_NAME_CACHE_OP_RESULT '-' PE_NAME_CACHE_OP_RESULT opt_e
>
> list = alloc_list();
> ABORT_ON(!list);
> - err = parse_events_add_cache(list, &parse_state->idx, $1, $3, $5, error, $6);
> + err = parse_events_add_cache(list, &parse_state->idx, $1, $3, $5, error, $6,
> + parse_state);
> parse_events_terms__delete($6);
> free($1);
> free($3);
> @@ -475,7 +464,8 @@ PE_NAME_CACHE_TYPE '-' PE_NAME_CACHE_OP_RESULT opt_event_config
>
> list = alloc_list();
> ABORT_ON(!list);
> - err = parse_events_add_cache(list, &parse_state->idx, $1, $3, NULL, error, $4);
> + err = parse_events_add_cache(list, &parse_state->idx, $1, $3, NULL, error, $4,
> + parse_state);
> parse_events_terms__delete($4);
> free($1);
> free($3);
> @@ -495,7 +485,8 @@ PE_NAME_CACHE_TYPE opt_event_config
>
> list = alloc_list();
> ABORT_ON(!list);
> - err = parse_events_add_cache(list, &parse_state->idx, $1, NULL, NULL, error, $2);
> + err = parse_events_add_cache(list, &parse_state->idx, $1, NULL, NULL, error, $2,
> + parse_state);
> parse_events_terms__delete($2);
> free($1);
> if (err) {
> --
> 2.17.1
>
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