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perf arm-spe: Enable timestamp for per-cpu mode
For per-cpu mmap, it should enable timestamp tracing for Arm SPE; this is helpful for samples correlation. To automatically enable the timestamp, a helper arm_spe_set_timestamp() is introduced for setting "ts_enable" format bit. Signed-off-by: Leo Yan <leo.yan@linaro.org> Reviewed-by: James Clark <james.clark@arm.com> Tested-by: James Clark <james.clark@arm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Al Grant <Al.Grant@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: John Garry <john.garry@huawei.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20210519041546.1574961-4-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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1 changed files with 31 additions and 2 deletions
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@ -14,6 +14,7 @@
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#include "../../../util/cpumap.h"
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#include "../../../util/cpumap.h"
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#include "../../../util/event.h"
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#include "../../../util/event.h"
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#include "../../../util/evsel.h"
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#include "../../../util/evsel.h"
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#include "../../../util/evsel_config.h"
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#include "../../../util/evlist.h"
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#include "../../../util/evlist.h"
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#include "../../../util/session.h"
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#include "../../../util/session.h"
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#include <internal/lib.h> // page_size
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#include <internal/lib.h> // page_size
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@ -32,6 +33,29 @@ struct arm_spe_recording {
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struct evlist *evlist;
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struct evlist *evlist;
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};
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};
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static void arm_spe_set_timestamp(struct auxtrace_record *itr,
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struct evsel *evsel)
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{
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struct arm_spe_recording *ptr;
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struct perf_pmu *arm_spe_pmu;
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struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
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u64 user_bits = 0, bit;
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ptr = container_of(itr, struct arm_spe_recording, itr);
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arm_spe_pmu = ptr->arm_spe_pmu;
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if (term)
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user_bits = term->val.cfg_chg;
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bit = perf_pmu__format_bits(&arm_spe_pmu->format, "ts_enable");
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/* Skip if user has set it */
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if (bit & user_bits)
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return;
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evsel->core.attr.config |= bit;
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}
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static size_t
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static size_t
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arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused,
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arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused,
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struct evlist *evlist __maybe_unused)
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struct evlist *evlist __maybe_unused)
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@ -121,9 +145,14 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
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*/
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*/
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evlist__to_front(evlist, arm_spe_evsel);
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evlist__to_front(evlist, arm_spe_evsel);
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/* In the case of per-cpu mmaps, sample CPU for AUX event. */
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/*
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if (!perf_cpu_map__empty(cpus))
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* In the case of per-cpu mmaps, sample CPU for AUX event;
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* also enable the timestamp tracing for samples correlation.
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*/
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if (!perf_cpu_map__empty(cpus)) {
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evsel__set_sample_bit(arm_spe_evsel, CPU);
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evsel__set_sample_bit(arm_spe_evsel, CPU);
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arm_spe_set_timestamp(itr, arm_spe_evsel);
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}
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/* Add dummy event to keep tracking */
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/* Add dummy event to keep tracking */
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err = parse_events(evlist, "dummy:u", NULL);
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err = parse_events(evlist, "dummy:u", NULL);
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