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perf record: Add support for PERF_SAMPLE_CODE_PAGE_SIZE

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Adds the infrastructure to sample the code address page size.

Introduce a new --code-page-size option for perf record.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Originally-by: Stephane Eranian <eranian@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210105195752.43489-4-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang
2021-01-05 11:57:49 -08:00
committed by Arnaldo Carvalho de Melo
parent 06280e3b15
commit c1de7f3d84
8 changed files with 34 additions and 2 deletions
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18
tools/perf/util/evsel.c
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@@ -1195,6 +1195,9 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,
if (opts->sample_data_page_size)
evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
if (opts->sample_code_page_size)
evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
if (opts->record_switch_events)
attr->context_switch = track;
@@ -1880,7 +1883,12 @@ try_fallback:
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
if (!perf_missing_features.data_page_size &&
if (!perf_missing_features.code_page_size &&
(evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) {
perf_missing_features.code_page_size = true;
pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n");
goto out_close;
} else if (!perf_missing_features.data_page_size &&
(evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) {
perf_missing_features.data_page_size = true;
pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n");
@@ -2376,6 +2384,12 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
array++;
}
data->code_page_size = 0;
if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
data->code_page_size = *array;
array++;
}
if (type & PERF_SAMPLE_AUX) {
OVERFLOW_CHECK_u64(array);
sz = *array++;
@@ -2685,6 +2699,8 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
"We found oprofile daemon running, please stop it and try again.");
break;
case EINVAL:
if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
if (evsel->core.attr.write_backward && perf_missing_features.write_backward)