diff options
author | Adrian Hunter <adrian.hunter@intel.com> | 2016-03-08 08:38:44 (GMT) |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-03-31 13:52:24 (GMT) |
commit | 46bc29b970f0011a9099077f1db8f3540aa829fe (patch) | |
tree | 938c97e15993470419809aa90273f7311e2180d6 /tools/perf/arch/x86 | |
parent | 39878d492c049796202b70dc0ef14449cafa3cb4 (diff) | |
download | linux-46bc29b970f0011a9099077f1db8f3540aa829fe.tar.xz |
perf tools: Add time conversion event
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>
Diffstat (limited to 'tools/perf/arch/x86')
-rw-r--r-- | tools/perf/arch/x86/util/tsc.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/tools/perf/arch/x86/util/tsc.c b/tools/perf/arch/x86/util/tsc.c index fd28684..70ff7c1 100644 --- a/tools/perf/arch/x86/util/tsc.c +++ b/tools/perf/arch/x86/util/tsc.c @@ -46,3 +46,34 @@ u64 rdtsc(void) 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); +} |