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perf arm-spe: Enable timestamp for per-cpu mode

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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>
This commit is contained in:
Leo Yan 2021-05-19 12:15:45 +08:00 committed by Arnaldo Carvalho de Melo
parent e582badf17
commit f99237e464
1 changed files with 31 additions and 2 deletions
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33
tools/perf/arch/arm64/util/arm-spe.c
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@ -14,6 +14,7 @@
#include "../../../util/cpumap.h"
#include "../../../util/event.h"
#include "../../../util/evsel.h"
#include "../../../util/evsel_config.h"
#include "../../../util/evlist.h"
#include "../../../util/session.h"
#include <internal/lib.h> // page_size
@ -32,6 +33,29 @@ struct arm_spe_recording {
struct evlist *evlist;
};
static void arm_spe_set_timestamp(struct auxtrace_record *itr,
struct evsel *evsel)
{
struct arm_spe_recording *ptr;
struct perf_pmu *arm_spe_pmu;
struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
u64 user_bits = 0, bit;
ptr = container_of(itr, struct arm_spe_recording, itr);
arm_spe_pmu = ptr->arm_spe_pmu;
if (term)
user_bits = term->val.cfg_chg;
bit = perf_pmu__format_bits(&arm_spe_pmu->format, "ts_enable");
/* Skip if user has set it */
if (bit & user_bits)
return;
evsel->core.attr.config |= bit;
}
static size_t
arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused,
struct evlist *evlist __maybe_unused)
@ -121,9 +145,14 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
*/
evlist__to_front(evlist, arm_spe_evsel);
/* In the case of per-cpu mmaps, sample CPU for AUX event. */
if (!perf_cpu_map__empty(cpus))
/*
* In the case of per-cpu mmaps, sample CPU for AUX event;
* also enable the timestamp tracing for samples correlation.
*/
if (!perf_cpu_map__empty(cpus)) {
evsel__set_sample_bit(arm_spe_evsel, CPU);
arm_spe_set_timestamp(itr, arm_spe_evsel);
}
/* Add dummy event to keep tracking */
err = parse_events(evlist, "dummy:u", NULL);