[PATCH 02/10] perf tools: Support PERF_SAMPLE_LBR_TOS
From: kan . liang
Date: Mon Oct 07 2019 - 14:00:27 EST
From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Support new sample type PERF_SAMPLE_LBR_TOS.
Enable LBR_TOS by default in LBR call stack mode.
If kernel doesn't support the sample type, switching it off.
Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---
tools/include/uapi/linux/perf_event.h | 4 +++-
tools/perf/util/event.h | 1 +
tools/perf/util/evsel.c | 16 +++++++++++++++-
tools/perf/util/evsel.h | 1 +
tools/perf/util/perf_event_attr_fprintf.c | 2 +-
tools/perf/util/synthetic-events.c | 8 ++++++++
6 files changed, 29 insertions(+), 3 deletions(-)
diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index bb7b271397a6..fe36ebb7dc2e 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -141,8 +141,9 @@ enum perf_event_sample_format {
PERF_SAMPLE_TRANSACTION = 1U << 17,
PERF_SAMPLE_REGS_INTR = 1U << 18,
PERF_SAMPLE_PHYS_ADDR = 1U << 19,
+ PERF_SAMPLE_LBR_TOS = 1U << 20,
- PERF_SAMPLE_MAX = 1U << 20, /* non-ABI */
+ PERF_SAMPLE_MAX = 1U << 21, /* non-ABI */
__PERF_SAMPLE_CALLCHAIN_EARLY = 1ULL << 63, /* non-ABI; internal use */
};
@@ -864,6 +865,7 @@ enum perf_event_type {
* { u64 abi; # enum perf_sample_regs_abi
* u64 regs[weight(mask)]; } && PERF_SAMPLE_REGS_INTR
* { u64 phys_addr;} && PERF_SAMPLE_PHYS_ADDR
+ * { u64 tos;} && PERF_SAMPLE_LBR_TOS
* };
*/
PERF_RECORD_SAMPLE = 9,
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index a0a0c91cde4a..268c1715e032 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -130,6 +130,7 @@ struct perf_sample {
u32 raw_size;
u64 data_src;
u64 phys_addr;
+ u64 tos;
u32 flags;
u16 insn_len;
u8 cpumode;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index abc7fda4a0fe..0752417bbc45 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -709,6 +709,7 @@ static void __perf_evsel__config_callchain(struct evsel *evsel,
"Falling back to framepointers.\n");
} else {
perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
+ perf_evsel__set_sample_bit(evsel, LBR_TOS);
attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
PERF_SAMPLE_BRANCH_CALL_STACK |
PERF_SAMPLE_BRANCH_NO_CYCLES |
@@ -762,6 +763,7 @@ perf_evsel__reset_callgraph(struct evsel *evsel,
perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
if (param->record_mode == CALLCHAIN_LBR) {
perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
+ perf_evsel__reset_sample_bit(evsel, LBR_TOS);
attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
PERF_SAMPLE_BRANCH_CALL_STACK);
}
@@ -1641,6 +1643,8 @@ int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
evsel->core.attr.ksymbol = 0;
if (perf_missing_features.bpf)
evsel->core.attr.bpf_event = 0;
+ if (perf_missing_features.lbr_tos)
+ perf_evsel__reset_sample_bit(evsel, LBR_TOS);
retry_sample_id:
if (perf_missing_features.sample_id_all)
evsel->core.attr.sample_id_all = 0;
@@ -1752,7 +1756,11 @@ int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
* Must probe features in the order they were added to the
* perf_event_attr interface.
*/
- if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
+ if (!perf_missing_features.lbr_tos && (evsel->core.attr.sample_type & PERF_SAMPLE_LBR_TOS)) {
+ perf_missing_features.lbr_tos = true;
+ pr_debug2("switching off LBR TOS support\n");
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
perf_missing_features.aux_output = true;
pr_debug2("Kernel has no attr.aux_output support, bailing out\n");
goto out_close;
@@ -2206,6 +2214,12 @@ int perf_evsel__parse_sample(struct evsel *evsel, union perf_event *event,
array++;
}
+ data->tos = -1ULL;
+ if (type & PERF_SAMPLE_LBR_TOS) {
+ data->tos = *array;
+ array++;
+ }
+
return 0;
}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index ddc5ee6f6592..e4768c60da93 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -115,6 +115,7 @@ struct perf_missing_features {
bool ksymbol;
bool bpf;
bool aux_output;
+ bool lbr_tos;
};
extern struct perf_missing_features perf_missing_features;
diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
index d4ad3f04923a..254f1bf8dcae 100644
--- a/tools/perf/util/perf_event_attr_fprintf.c
+++ b/tools/perf/util/perf_event_attr_fprintf.c
@@ -34,7 +34,7 @@ static void __p_sample_type(char *buf, size_t size, u64 value)
bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
- bit_name(WEIGHT), bit_name(PHYS_ADDR),
+ bit_name(WEIGHT), bit_name(PHYS_ADDR), bit_name(LBR_TOS),
{ .name = NULL, }
};
#undef bit_name
diff --git a/tools/perf/util/synthetic-events.c b/tools/perf/util/synthetic-events.c
index 807cbca403a7..a7d02e81defe 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -1228,6 +1228,9 @@ size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
if (type & PERF_SAMPLE_PHYS_ADDR)
result += sizeof(u64);
+ if (type & PERF_SAMPLE_LBR_TOS)
+ result += sizeof(u64);
+
return result;
}
@@ -1396,6 +1399,11 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_fo
array++;
}
+ if (type & PERF_SAMPLE_LBR_TOS) {
+ *array = sample->tos;
+ array++;
+ }
+
return 0;
}
--
2.17.1