From: Leo Yan <leo.yan@linaro.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
James Clark <james.clark@arm.com>,
John Garry <john.garry@huawei.com>, Will Deacon <will@kernel.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Dave Martin <Dave.Martin@arm.com>, Al Grant <Al.Grant@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v5 1/5] perf arm-spe: Save clock parameters from TIME_CONV event
Date: Wed, 19 May 2021 15:19:35 +0800 [thread overview]
Message-ID: <20210519071939.1598923-2-leo.yan@linaro.org> (raw)
In-Reply-To: <20210519071939.1598923-1-leo.yan@linaro.org>
During the recording phase, "perf record" tool synthesizes event
PERF_RECORD_TIME_CONV for the hardware clock parameters and saves the
event into the data file.
Afterwards, when processing the data file, the event TIME_CONV will be
processed at the very early time and is stored into session context.
This patch extracts these parameters from the session context and saves
into the structure "spe->tc" with the type perf_tsc_conversion, so that
the parameters are ready for conversion between clock counter and time
stamp.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
tools/perf/util/arm-spe.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
index 2539d4baec44..d2ae5a5c13ee 100644
--- a/tools/perf/util/arm-spe.c
+++ b/tools/perf/util/arm-spe.c
@@ -26,6 +26,7 @@
#include "symbol.h"
#include "thread.h"
#include "thread-stack.h"
+#include "tsc.h"
#include "tool.h"
#include "util/synthetic-events.h"
@@ -45,6 +46,8 @@ struct arm_spe {
struct machine *machine;
u32 pmu_type;
+ struct perf_tsc_conversion tc;
+
u8 timeless_decoding;
u8 data_queued;
@@ -1006,6 +1009,7 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
{
struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
size_t min_sz = sizeof(u64) * ARM_SPE_AUXTRACE_PRIV_MAX;
+ struct perf_record_time_conv *tc = &session->time_conv;
struct arm_spe *spe;
int err;
@@ -1027,6 +1031,28 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
spe->pmu_type = auxtrace_info->priv[ARM_SPE_PMU_TYPE];
spe->timeless_decoding = arm_spe__is_timeless_decoding(spe);
+
+ /*
+ * The synthesized event PERF_RECORD_TIME_CONV has been handled ahead
+ * and the parameters for hardware clock are stored in the session
+ * context. Passes these parameters to the struct perf_tsc_conversion
+ * in "spe->tc", which is used for later conversion between clock
+ * counter and timestamp.
+ *
+ * For backward compatibility, copies the fields starting from
+ * "time_cycles" only if they are contained in the event.
+ */
+ spe->tc.time_shift = tc->time_shift;
+ spe->tc.time_mult = tc->time_mult;
+ spe->tc.time_zero = tc->time_zero;
+
+ if (event_contains(*tc, time_cycles)) {
+ spe->tc.time_cycles = tc->time_cycles;
+ spe->tc.time_mask = tc->time_mask;
+ spe->tc.cap_user_time_zero = tc->cap_user_time_zero;
+ spe->tc.cap_user_time_short = tc->cap_user_time_short;
+ }
+
spe->auxtrace.process_event = arm_spe_process_event;
spe->auxtrace.process_auxtrace_event = arm_spe_process_auxtrace_event;
spe->auxtrace.flush_events = arm_spe_flush;
--
2.25.1
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next prev parent reply other threads:[~2021-05-19 7:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 7:19 [PATCH v5 0/5] perf arm-spe: Enable timestamp Leo Yan
2021-05-19 7:19 ` Leo Yan [this message]
2021-05-19 7:19 ` [PATCH v5 2/5] perf arm-spe: Convert event kernel time to counter value Leo Yan
2021-05-19 7:19 ` [PATCH v5 3/5] perf arm-spe: Assign kernel time to synthesized event Leo Yan
2021-05-19 7:19 ` [PATCH v5 4/5] perf arm-spe: Bail out if the trace is later than perf event Leo Yan
2021-05-19 7:19 ` [PATCH v5 5/5] perf arm-spe: Don't wait for PERF_RECORD_EXIT event Leo Yan
2021-06-25 13:25 ` James Clark
2021-06-28 12:12 ` Leo Yan
2021-07-01 17:03 ` Arnaldo Carvalho de Melo
2021-07-02 1:31 ` Leo Yan
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