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perf list: Give more details about raw event encodings

Browse source 
List all the PMUs, not just the first core one, and list real format
specifiers with value ranges.

Before:

  $ perf list
  ...
    rNNN                                               [Raw hardware event descriptor]
    cpu/t1=v1[,t2=v2,t3 ...]/modifier                  [Raw hardware event descriptor]
         [(see 'man perf-list' on how to encode it)]
    mem:<addr>[/len][:access]                          [Hardware breakpoint]
  ...

After:

  $ perf list
  ...
    rNNN                                               [Raw event descriptor]
    cpu/event=0..255,pc,edge,.../modifier              [Raw event descriptor]
         [(see 'man perf-list' or 'man perf-record' on how to encode it)]
    breakpoint//modifier                               [Raw event descriptor]
    cstate_core/event=0..0xffffffffffffffff/modifier   [Raw event descriptor]
    cstate_pkg/event=0..0xffffffffffffffff/modifier    [Raw event descriptor]
    i915/i915_eventid=0..0x1fffff/modifier             [Raw event descriptor]
    intel_bts//modifier                                [Raw event descriptor]
    intel_pt/ptw,event,cyc_thresh=0..15,.../modifier   [Raw event descriptor]
    kprobe/retprobe/modifier                           [Raw event descriptor]
    msr/event=0..0xffffffffffffffff/modifier           [Raw event descriptor]
    power/event=0..255/modifier                        [Raw event descriptor]
    software//modifier                                 [Raw event descriptor]
    tracepoint//modifier                               [Raw event descriptor]
    uncore_arb/event=0..255,edge,inv,.../modifier      [Raw event descriptor]
    uncore_cbox/event=0..255,edge,inv,.../modifier     [Raw event descriptor]
    uncore_clock/event=0..255/modifier                 [Raw event descriptor]
    uncore_imc_free_running/event=0..255,umask=0..255/modifier[Raw event descriptor]
    uprobe/ref_ctr_offset=0..0xffffffff,retprobe/modifier[Raw event descriptor]
    mem:<addr>[/len][:access]                          [Hardware breakpoint]
  ...

With '--details' provide more details on the formats encoding:

  cpu/event=0..255,pc,edge,.../modifier              [Raw event descriptor]
       [(see 'man perf-list' or 'man perf-record' on how to encode it)]
        cpu/event=0..255,pc,edge,offcore_rsp=0..0xffffffffffffffff,ldlat=0..0xffff,inv,
        umask=0..255,frontend=0..0xffffff,cmask=0..255,config=0..0xffffffffffffffff,
        config1=0..0xffffffffffffffff,config2=0..0xffffffffffffffff,config3=0..0xffffffffffffffff,
        name=string,period=number,freq=number,branch_type=(u|k|hv|any|...),time,
        call-graph=(fp|dwarf|lbr),stack-size=number,max-stack=number,nr=number,inherit,no-inherit,
        overwrite,no-overwrite,percore,aux-output,aux-sample-size=number/modifier
  breakpoint//modifier                               [Raw event descriptor]
        breakpoint//modifier
  cstate_core/event=0..0xffffffffffffffff/modifier   [Raw event descriptor]
        cstate_core/event=0..0xffffffffffffffff/modifier
  cstate_pkg/event=0..0xffffffffffffffff/modifier    [Raw event descriptor]
        cstate_pkg/event=0..0xffffffffffffffff/modifier
  i915/i915_eventid=0..0x1fffff/modifier             [Raw event descriptor]
        i915/i915_eventid=0..0x1fffff/modifier
  intel_bts//modifier                                [Raw event descriptor]
        intel_bts//modifier
  intel_pt/ptw,event,cyc_thresh=0..15,.../modifier   [Raw event descriptor]
        intel_pt/ptw,event,cyc_thresh=0..15,pt,notnt,branch,tsc,pwr_evt,fup_on_ptw,cyc,noretcomp,
        mtc,psb_period=0..15,mtc_period=0..15/modifier
  kprobe/retprobe/modifier                           [Raw event descriptor]
        kprobe/retprobe/modifier
  msr/event=0..0xffffffffffffffff/modifier           [Raw event descriptor]
        msr/event=0..0xffffffffffffffff/modifier
  power/event=0..255/modifier                        [Raw event descriptor]
        power/event=0..255/modifier
  software//modifier                                 [Raw event descriptor]
        software//modifier
  tracepoint//modifier                               [Raw event descriptor]
        tracepoint//modifier
  uncore_arb/event=0..255,edge,inv,.../modifier      [Raw event descriptor]
        uncore_arb/event=0..255,edge,inv,umask=0..255,cmask=0..31/modifier
  uncore_cbox/event=0..255,edge,inv,.../modifier     [Raw event descriptor]
        uncore_cbox/event=0..255,edge,inv,umask=0..255,cmask=0..31/modifier
  uncore_clock/event=0..255/modifier                 [Raw event descriptor]
        uncore_clock/event=0..255/modifier
  uncore_imc_free_running/event=0..255,umask=0..255/modifier[Raw event descriptor]
        uncore_imc_free_running/event=0..255,umask=0..255/modifier
  uprobe/ref_ctr_offset=0..0xffffffff,retprobe/modifier[Raw event descriptor]
        uprobe/ref_ctr_offset=0..0xffffffff,retprobe/modifier

Committer notes:

Address this build error in various distros:

  55    58.44 ubuntu:24.04                  : FAIL gcc version 13.2.0 (Ubuntu 13.2.0-17ubuntu2)
    util/pmu.c:1638:70: error: '_Static_assert' with no message is a C2x extension [-Werror,-Wc2x-extensions]
     1638 |         _Static_assert(ARRAY_SIZE(terms) == __PARSE_EVENTS__TERM_TYPE_NR - 6);
          |                                                                             ^
          |                                                                             , ""
    1 error generated.

Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20240308001915.4060155-5-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2024-03-07 16:19:13 -08:00 committed by Arnaldo Carvalho de Melo
parent aa1f4ad287
commit 4ccf3bb703
5 changed files with 161 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

62
tools/perf/util/pmu.c
View file

@ -1603,6 +1603,62 @@ bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name)
return false;
}
int perf_pmu__for_each_format(struct perf_pmu *pmu, void *state, pmu_format_callback cb)
{
static const char *const terms[] = {
"config=0..0xffffffffffffffff",
"config1=0..0xffffffffffffffff",
"config2=0..0xffffffffffffffff",
"config3=0..0xffffffffffffffff",
"name=string",
"period=number",
"freq=number",
"branch_type=(u|k|hv|any|...)",
"time",
"call-graph=(fp|dwarf|lbr)",
"stack-size=number",
"max-stack=number",
"nr=number",
"inherit",
"no-inherit",
"overwrite",
"no-overwrite",
"percore",
"aux-output",
"aux-sample-size=number",
};
struct perf_pmu_format *format;
int ret;
/*
* max-events and driver-config are missing above as are the internal
* types user, metric-id, raw, legacy cache and hardware. Assert against
* the enum parse_events__term_type so they are kept in sync.
*/
_Static_assert(ARRAY_SIZE(terms) == __PARSE_EVENTS__TERM_TYPE_NR - 6,
"perf_pmu__for_each_format()'s terms must be kept in sync with enum parse_events__term_type");
list_for_each_entry(format, &pmu->format, list) {
perf_pmu_format__load(pmu, format);
ret = cb(state, format->name, (int)format->value, format->bits);
if (ret)
return ret;
}
if (!pmu->is_core)
return 0;
for (size_t i = 0; i < ARRAY_SIZE(terms); i++) {
int config = PERF_PMU_FORMAT_VALUE_CONFIG;
if (i < PERF_PMU_FORMAT_VALUE_CONFIG_END)
config = i;
ret = cb(state, terms[i], config, /*bits=*/NULL);
if (ret)
return ret;
}
return 0;
}
bool is_pmu_core(const char *name)
{
return !strcmp(name, "cpu") || !strcmp(name, "cpum_cf") || is_sysfs_pmu_core(name);
@ -1697,8 +1753,12 @@ int perf_pmu__for_each_event(struct perf_pmu *pmu, bool skip_duplicate_pmus,
pmu_add_cpu_aliases(pmu);
list_for_each_entry(event, &pmu->aliases, list) {
size_t buf_used;
int pmu_name_len;
info.pmu_name = event->pmu_name ?: pmu->name;
pmu_name_len = skip_duplicate_pmus
? pmu_name_len_no_suffix(info.pmu_name, /*num=*/NULL)
: (int)strlen(info.pmu_name);
info.alias = NULL;
if (event->desc) {
info.name = event->name;
@ -1723,7 +1783,7 @@ int perf_pmu__for_each_event(struct perf_pmu *pmu, bool skip_duplicate_pmus,
info.encoding_desc = buf + buf_used;
parse_events_terms__to_strbuf(&event->terms, &sb);
buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
"%s/%s/", info.pmu_name, sb.buf) + 1;
"%.*s/%s/", pmu_name_len, info.pmu_name, sb.buf) + 1;
info.topic = event->topic;
info.str = sb.buf;
info.deprecated = event->deprecated;

3
tools/perf/util/pmu.h
View file

@ -196,6 +196,8 @@ struct pmu_event_info {
};
typedef int (*pmu_event_callback)(void *state, struct pmu_event_info *info);
typedef int (*pmu_format_callback)(void *state, const char *name, int config,
const unsigned long *bits);
void pmu_add_sys_aliases(struct perf_pmu *pmu);
int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
@ -215,6 +217,7 @@ int perf_pmu__find_event(struct perf_pmu *pmu, const char *event, void *state, p
int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load);
void perf_pmu_format__set_value(void *format, int config, unsigned long *bits);
bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name);
int perf_pmu__for_each_format(struct perf_pmu *pmu, void *state, pmu_format_callback cb);
bool is_pmu_core(const char *name);
bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu);

94
tools/perf/util/pmus.c
View file

@ -16,6 +16,7 @@
#include "pmus.h"
#include "pmu.h"
#include "print-events.h"
#include "strbuf.h"
/*
* core_pmus: A PMU belongs to core_pmus if it's name is "cpu" or it's sysfs
@ -503,6 +504,99 @@ void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *p
zfree(&aliases);
}
struct build_format_string_args {
struct strbuf short_string;
struct strbuf long_string;
int num_formats;
};
static int build_format_string(void *state, const char *name, int config,
const unsigned long *bits)
{
struct build_format_string_args *args = state;
unsigned int num_bits;
int ret1, ret2 = 0;
(void)config;
args->num_formats++;
if (args->num_formats > 1) {
strbuf_addch(&args->long_string, ',');
if (args->num_formats < 4)
strbuf_addch(&args->short_string, ',');
}
num_bits = bits ? bitmap_weight(bits, PERF_PMU_FORMAT_BITS) : 0;
if (num_bits <= 1) {
ret1 = strbuf_addf(&args->long_string, "%s", name);
if (args->num_formats < 4)
ret2 = strbuf_addf(&args->short_string, "%s", name);
} else if (num_bits > 8) {
ret1 = strbuf_addf(&args->long_string, "%s=0..0x%llx", name,
ULLONG_MAX >> (64 - num_bits));
if (args->num_formats < 4) {
ret2 = strbuf_addf(&args->short_string, "%s=0..0x%llx", name,
ULLONG_MAX >> (64 - num_bits));
}
} else {
ret1 = strbuf_addf(&args->long_string, "%s=0..%llu", name,
ULLONG_MAX >> (64 - num_bits));
if (args->num_formats < 4) {
ret2 = strbuf_addf(&args->short_string, "%s=0..%llu", name,
ULLONG_MAX >> (64 - num_bits));
}
}
return ret1 < 0 ? ret1 : (ret2 < 0 ? ret2 : 0);
}
void perf_pmus__print_raw_pmu_events(const struct print_callbacks *print_cb, void *print_state)
{
bool skip_duplicate_pmus = print_cb->skip_duplicate_pmus(print_state);
struct perf_pmu *(*scan_fn)(struct perf_pmu *);
struct perf_pmu *pmu = NULL;
if (skip_duplicate_pmus)
scan_fn = perf_pmus__scan_skip_duplicates;
else
scan_fn = perf_pmus__scan;
while ((pmu = scan_fn(pmu)) != NULL) {
struct build_format_string_args format_args = {
.short_string = STRBUF_INIT,
.long_string = STRBUF_INIT,
.num_formats = 0,
};
int len = pmu_name_len_no_suffix(pmu->name, /*num=*/NULL);
const char *desc = "(see 'man perf-list' or 'man perf-record' on how to encode it)";
if (!pmu->is_core)
desc = NULL;
strbuf_addf(&format_args.short_string, "%.*s/", len, pmu->name);
strbuf_addf(&format_args.long_string, "%.*s/", len, pmu->name);
perf_pmu__for_each_format(pmu, &format_args, build_format_string);
if (format_args.num_formats > 3)
strbuf_addf(&format_args.short_string, ",.../modifier");
else
strbuf_addf(&format_args.short_string, "/modifier");
strbuf_addf(&format_args.long_string, "/modifier");
print_cb->print_event(print_state,
/*topic=*/NULL,
/*pmu_name=*/NULL,
format_args.short_string.buf,
/*event_alias=*/NULL,
/*scale_unit=*/NULL,
/*deprecated=*/false,
"Raw event descriptor",
desc,
/*long_desc=*/NULL,
format_args.long_string.buf);
strbuf_release(&format_args.short_string);
strbuf_release(&format_args.long_string);
}
}
bool perf_pmus__have_event(const char *pname, const char *name)
{
struct perf_pmu *pmu = perf_pmus__find(pname);

1
tools/perf/util/pmus.h
View file

@ -18,6 +18,7 @@ struct perf_pmu *perf_pmus__scan_core(struct perf_pmu *pmu);
const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str);
void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *print_state);
void perf_pmus__print_raw_pmu_events(const struct print_callbacks *print_cb, void *print_state);
bool perf_pmus__have_event(const char *pname, const char *name);
int perf_pmus__num_core_pmus(void);
bool perf_pmus__supports_extended_type(void);

20
tools/perf/util/print-events.c
View file

@ -39,7 +39,7 @@ static const char * const event_type_descriptors[] = {
"Software event",
"Tracepoint event",
"Hardware cache event",
"Raw hardware event descriptor",
"Raw event descriptor",
"Hardware breakpoint",
};
@ -416,8 +416,6 @@ void print_symbol_events(const struct print_callbacks *print_cb, void *print_sta
*/
void print_events(const struct print_callbacks *print_cb, void *print_state)
{
char *tmp;
print_symbol_events(print_cb, print_state, PERF_TYPE_HARDWARE,
event_symbols_hw, PERF_COUNT_HW_MAX);
print_symbol_events(print_cb, print_state, PERF_TYPE_SOFTWARE,
@ -441,21 +439,7 @@ void print_events(const struct print_callbacks *print_cb, void *print_state)
/*long_desc=*/NULL,
/*encoding_desc=*/NULL);
if (asprintf(&tmp, "%s/t1=v1[,t2=v2,t3 ...]/modifier",
perf_pmus__scan_core(/*pmu=*/NULL)->name) > 0) {
print_cb->print_event(print_state,
/*topic=*/NULL,
/*pmu_name=*/NULL,
tmp,
/*event_alias=*/NULL,
/*scale_unit=*/NULL,
/*deprecated=*/false,
event_type_descriptors[PERF_TYPE_RAW],
"(see 'man perf-list' on how to encode it)",
/*long_desc=*/NULL,
/*encoding_desc=*/NULL);
free(tmp);
}
perf_pmus__print_raw_pmu_events(print_cb, print_state);
print_cb->print_event(print_state,
/*topic=*/NULL,