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perf tools: Add fake pmu support

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Add a way to create a pmu event without the actual PMU being in place.

This way we can test metrics defined for any processor.

The interface is to define fake_pmu in struct parse_events_state data.
It will be used only in tests via special interface function added in
following changes.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200602214741.1218986-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2020-06-02 23:47:29 +02:00 committed by Arnaldo Carvalho de Melo
parent a1f8bc95c3
commit 387ad33fe7
4 changed files with 50 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
tools/perf/util/parse-events.c
View File

@ -1450,7 +1450,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
fprintf(stderr, "' that may result in non-fatal errors\n");
}
pmu = perf_pmu__find(name);
pmu = parse_state->fake_pmu ?: perf_pmu__find(name);
if (!pmu) {
char *err_str;
@ -1483,7 +1483,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
}
}
if (perf_pmu__check_alias(pmu, head_config, &info))
if (!parse_state->fake_pmu && perf_pmu__check_alias(pmu, head_config, &info))
return -EINVAL;
if (verbose > 1) {
@ -1516,7 +1516,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
if (pmu->default_config && get_config_chgs(pmu, head_config, &config_terms))
return -ENOMEM;
if (perf_pmu__config(pmu, &attr, head_config, parse_state->error)) {
if (!parse_state->fake_pmu && perf_pmu__config(pmu, &attr, head_config, parse_state->error)) {
struct evsel_config_term *pos, *tmp;
list_for_each_entry_safe(pos, tmp, &config_terms, list) {

1
tools/perf/util/parse-events.h
View File

@ -130,6 +130,7 @@ struct parse_events_state {
struct evlist *evlist;
struct list_head *terms;
int stoken;
struct perf_pmu *fake_pmu;
};
void parse_events__handle_error(struct parse_events_error *err, int idx,

8
tools/perf/util/parse-events.l
View File

@ -129,12 +129,16 @@ do { \
yyless(0); \
} while (0)
static int pmu_str_check(yyscan_t scanner)
static int pmu_str_check(yyscan_t scanner, struct parse_events_state *parse_state)
{
YYSTYPE *yylval = parse_events_get_lval(scanner);
char *text = parse_events_get_text(scanner);
yylval->str = strdup(text);
if (parse_state->fake_pmu)
return PE_PMU_EVENT_FAKE;
switch (perf_pmu__parse_check(text)) {
case PMU_EVENT_SYMBOL_PREFIX:
return PE_PMU_EVENT_PRE;
@ -376,7 +380,7 @@ r{num_raw_hex} { return raw(yyscanner); }
{modifier_event} { return str(yyscanner, PE_MODIFIER_EVENT); }
{bpf_object} { if (!isbpf(yyscanner)) { USER_REJECT }; return str(yyscanner, PE_BPF_OBJECT); }
{bpf_source} { if (!isbpf(yyscanner)) { USER_REJECT }; return str(yyscanner, PE_BPF_SOURCE); }
{name} { return pmu_str_check(yyscanner); }
{name} { return pmu_str_check(yyscanner, _parse_state); }
{name_tag} { return str(yyscanner, PE_NAME); }
"/" { BEGIN(config); return '/'; }
- { return '-'; }

41
tools/perf/util/parse-events.y
View File

@ -69,7 +69,7 @@ static void inc_group_count(struct list_head *list,
%token PE_NAME_CACHE_TYPE PE_NAME_CACHE_OP_RESULT
%token PE_PREFIX_MEM PE_PREFIX_RAW PE_PREFIX_GROUP
%token PE_ERROR
%token PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT
%token PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT PE_PMU_EVENT_FAKE
%token PE_ARRAY_ALL PE_ARRAY_RANGE
%token PE_DRV_CFG_TERM
%type <num> PE_VALUE
@ -87,7 +87,7 @@ static void inc_group_count(struct list_head *list,
%type <str> PE_MODIFIER_EVENT
%type <str> PE_MODIFIER_BP
%type <str> PE_EVENT_NAME
%type <str> PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT
%type <str> PE_PMU_EVENT_PRE PE_PMU_EVENT_SUF PE_KERNEL_PMU_EVENT PE_PMU_EVENT_FAKE
%type <str> PE_DRV_CFG_TERM
%destructor { free ($$); } <str>
%type <term> event_term
@ -356,6 +356,43 @@ PE_PMU_EVENT_PRE '-' PE_PMU_EVENT_SUF sep_dc
YYABORT;
$$ = list;
}
|
PE_PMU_EVENT_FAKE sep_dc
{
struct list_head *list;
int err;
list = alloc_list();
if (!list)
YYABORT;
err = parse_events_add_pmu(_parse_state, list, $1, NULL, false, false);
free($1);
if (err < 0) {
free(list);
YYABORT;
}
$$ = list;
}
|
PE_PMU_EVENT_FAKE opt_pmu_config
{
struct list_head *list;
int err;
list = alloc_list();
if (!list)
YYABORT;
err = parse_events_add_pmu(_parse_state, list, $1, $2, false, false);
free($1);
parse_events_terms__delete($2);
if (err < 0) {
free(list);
YYABORT;
}
$$ = list;
}
value_sym:
PE_VALUE_SYM_HW