Intel PT uses the time members from the perf_event_mmap_page to convert
between TSC and perf time.
Due to a lack of foresight when Intel PT was implemented, those time
members were recorded in the (implementation dependent) AUXTRACE_INFO
event, the structure of which is generally inaccessible outside of the
Intel PT decoder. However now the conversion between TSC and perf time
is needed when processing a jitdump file when Intel PT has been used for
tracing.
So add a user event to record the time members. 'perf record' will
synthesize the event if the information is available. And session
processing will put a copy of the event on the session so that tools
like 'perf inject' can easily access it.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1457426324-30158-1-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
return low | ((u64)high) << 32;
}
+
+int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
+ struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine)
+{
+ union perf_event event = {
+ .time_conv = {
+ .header = {
+ .type = PERF_RECORD_TIME_CONV,
+ .size = sizeof(struct time_conv_event),
+ },
+ },
+ };
+ struct perf_tsc_conversion tc;
+ int err;
+
+ err = perf_read_tsc_conversion(pc, &tc);
+ if (err == -EOPNOTSUPP)
+ return 0;
+ if (err)
+ return err;
+
+ pr_debug2("Synthesizing TSC conversion information\n");
+
+ event.time_conv.time_mult = tc.time_mult;
+ event.time_conv.time_shift = tc.time_shift;
+ event.time_conv.time_zero = tc.time_zero;
+
+ return process(tool, &event, NULL, machine);
+}
.auxtrace_info = perf_event__repipe_op2_synth,
.auxtrace = perf_event__repipe_auxtrace,
.auxtrace_error = perf_event__repipe_op2_synth,
+ .time_conv = perf_event__repipe_op2_synth,
.finished_round = perf_event__repipe_oe_synth,
.build_id = perf_event__repipe_op2_synth,
.id_index = perf_event__repipe_op2_synth,
#include "util/data.h"
#include "util/perf_regs.h"
#include "util/auxtrace.h"
+#include "util/tsc.h"
#include "util/parse-branch-options.h"
#include "util/parse-regs-options.h"
#include "util/llvm-utils.h"
static void snapshot_sig_handler(int sig);
+int __weak
+perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
+ struct perf_tool *tool __maybe_unused,
+ perf_event__handler_t process __maybe_unused,
+ struct machine *machine __maybe_unused)
+{
+ return 0;
+}
+
static int record__synthesize(struct record *rec)
{
struct perf_session *session = rec->session;
}
}
+ err = perf_event__synth_time_conv(rec->evlist->mmap[0].base, tool,
+ process_synthesized_event, machine);
+ if (err)
+ goto out;
+
if (rec->opts.full_auxtrace) {
err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
session, process_synthesized_event);
[PERF_RECORD_STAT] = "STAT",
[PERF_RECORD_STAT_ROUND] = "STAT_ROUND",
[PERF_RECORD_EVENT_UPDATE] = "EVENT_UPDATE",
+ [PERF_RECORD_TIME_CONV] = "TIME_CONV",
};
const char *perf_event__name(unsigned int id)
PERF_RECORD_STAT = 76,
PERF_RECORD_STAT_ROUND = 77,
PERF_RECORD_EVENT_UPDATE = 78,
+ PERF_RECORD_TIME_CONV = 79,
PERF_RECORD_HEADER_MAX
};
u64 time;
};
+struct time_conv_event {
+ struct perf_event_header header;
+ u64 time_shift;
+ u64 time_mult;
+ u64 time_zero;
+};
+
union perf_event {
struct perf_event_header header;
struct mmap_event mmap;
struct stat_config_event stat_config;
struct stat_event stat;
struct stat_round_event stat_round;
+ struct time_conv_event time_conv;
};
void perf_event__print_totals(void);
tool->stat = process_stat_stub;
if (tool->stat_round == NULL)
tool->stat_round = process_stat_round_stub;
+ if (tool->time_conv == NULL)
+ tool->time_conv = process_event_op2_stub;
}
static void swap_sample_id_all(union perf_event *event, void *data)
[PERF_RECORD_STAT] = perf_event__stat_swap,
[PERF_RECORD_STAT_ROUND] = perf_event__stat_round_swap,
[PERF_RECORD_EVENT_UPDATE] = perf_event__event_update_swap,
+ [PERF_RECORD_TIME_CONV] = perf_event__all64_swap,
[PERF_RECORD_HEADER_MAX] = NULL,
};
return tool->stat(tool, event, session);
case PERF_RECORD_STAT_ROUND:
return tool->stat_round(tool, event, session);
+ case PERF_RECORD_TIME_CONV:
+ session->time_conv = event->time_conv;
+ return tool->time_conv(tool, event, session);
default:
return -EINVAL;
}
struct itrace_synth_opts *itrace_synth_opts;
struct list_head auxtrace_index;
struct trace_event tevent;
+ struct time_conv_event time_conv;
bool repipe;
bool one_mmap;
void *one_mmap_addr;
id_index,
auxtrace_info,
auxtrace_error,
+ time_conv,
thread_map,
cpu_map,
stat_config,
#include <linux/types.h>
+#include "event.h"
#include "../arch/x86/util/tsc.h"
u64 perf_time_to_tsc(u64 ns, struct perf_tsc_conversion *tc);
u64 tsc_to_perf_time(u64 cyc, struct perf_tsc_conversion *tc);
u64 rdtsc(void);
+struct perf_event_mmap_page;
+struct perf_tool;
+struct machine;
+
+int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
+ struct perf_tool *tool,
+ perf_event__handler_t process,
+ struct machine *machine);
+
#endif