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perf tsc: Support cap_user_time_short for event TIME_CONV

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The synthesized event TIME_CONV doesn't contain the complete parameters
for counters, this will lead to wrong conversion between counter cycles
and timestamp.

This patch extends event TIME_CONV to record flags 'cap_user_time_zero'
which is used to indicate the counter parameters are valid or not, if
not will directly return 0 for timestamp calculation.  And record the
flag 'cap_user_time_short' and its relevant fields 'time_cycles' and
'time_mask' for cycle calibration.

Signed-off-by: Leo Yan <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Gustavo A. R. Silva <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kemeng Shi <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mathieu Poirier <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nick Gasson <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Remi Bernon <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Steve Maclean <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Zou Wei <[email protected]>
Cc: [email protected]
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Leo Yan authored and Arnaldo Carvalho de Melo committed 2020-09-22 13:46:40 -03:00
1 parent 78a93d4cec
commit d110162caf
3 files changed
+16 -4
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tools/lib/perf/include/perf/event.h
+4
View File
@@ -324,6 +324,10 @@ struct perf_record_time_conv {
__u64 time_shift;
__u64 time_mult;
__u64 time_zero;
__u64 time_cycles;
__u64 time_mask;
bool cap_user_time_zero;
bool cap_user_time_short;
};
struct perf_record_header_feature {
tools/perf/util/jitdump.c
+8 -4
View File
@@ -374,11 +374,15 @@ static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp)
if (!jd->use_arch_timestamp)
return timestamp;
tc.time_shift = jd->session->time_conv.time_shift;
tc.time_mult = jd->session->time_conv.time_mult;
tc.time_zero = jd->session->time_conv.time_zero;
tc.time_shift = jd->session->time_conv.time_shift;
tc.time_mult = jd->session->time_conv.time_mult;
tc.time_zero = jd->session->time_conv.time_zero;
tc.time_cycles = jd->session->time_conv.time_cycles;
tc.time_mask = jd->session->time_conv.time_mask;
tc.cap_user_time_zero = jd->session->time_conv.cap_user_time_zero;
tc.cap_user_time_short = jd->session->time_conv.cap_user_time_short;
if (!tc.time_mult)
if (!tc.cap_user_time_zero)
return 0;
return tsc_to_perf_time(timestamp, &tc);
tools/perf/util/tsc.c
+4
View File
@@ -98,6 +98,10 @@ int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
event.time_conv.time_mult = tc.time_mult;
event.time_conv.time_shift = tc.time_shift;
event.time_conv.time_zero = tc.time_zero;
event.time_conv.time_cycles = tc.time_cycles;
event.time_conv.time_mask = tc.time_mask;
event.time_conv.cap_user_time_zero = tc.cap_user_time_zero;
event.time_conv.cap_user_time_short = tc.cap_user_time_short;
return process(tool, &event, NULL, machine);
}