Add a new event type for deferred callchains and a new callback for the struct perf_tool. For now it doesn't actually handle the deferred callchains but it just marks the sample if it has the PERF_CONTEXT_ USER_DEFFERED in the callchain array.
At least, perf report can dump the raw data with this change. Actually this requires the next commit to enable attr.defer_callchain, but if you already have a data file, it'll show the following result. $ perf report -D ... [email protected] [0x40]: event: 22 . . ... raw event: size 64 bytes . 0000: 16 00 00 00 02 00 40 00 06 00 00 00 0b 00 00 00 ......@......... . 0010: 03 00 00 00 00 00 00 00 a7 7f 33 fe 18 7f 00 00 ..........3..... . 0020: 0f 0e 33 fe 18 7f 00 00 48 14 33 fe 18 7f 00 00 ..3.....H.3..... . 0030: 08 09 00 00 08 09 00 00 e6 7a e7 35 1c 00 00 00 .........z.5.... 121163447014 0x2158 [0x40]: PERF_RECORD_CALLCHAIN_DEFERRED(IP, 0x2): 2312/2312: 0xb00000006 ... FP chain: nr:3 ..... 0: 00007f18fe337fa7 ..... 1: 00007f18fe330e0f ..... 2: 00007f18fe331448 : unhandled! Signed-off-by: Namhyung Kim <[email protected]> --- tools/lib/perf/include/perf/event.h | 8 ++++++++ tools/perf/util/event.c | 1 + tools/perf/util/evsel.c | 19 +++++++++++++++++++ tools/perf/util/machine.c | 1 + tools/perf/util/perf_event_attr_fprintf.c | 2 ++ tools/perf/util/sample.h | 2 ++ tools/perf/util/session.c | 20 ++++++++++++++++++++ tools/perf/util/tool.c | 1 + tools/perf/util/tool.h | 3 ++- 9 files changed, 56 insertions(+), 1 deletion(-) diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h index aa1e91c97a226e1a..769bc48ca85c0eb8 100644 --- a/tools/lib/perf/include/perf/event.h +++ b/tools/lib/perf/include/perf/event.h @@ -151,6 +151,13 @@ struct perf_record_switch { __u32 next_prev_tid; }; +struct perf_record_callchain_deferred { + struct perf_event_header header; + __u64 cookie; + __u64 nr; + __u64 ips[]; +}; + struct perf_record_header_attr { struct perf_event_header header; struct perf_event_attr attr; @@ -523,6 +530,7 @@ union perf_event { struct perf_record_read read; struct perf_record_throttle throttle; struct perf_record_sample sample; + struct perf_record_callchain_deferred callchain_deferred; struct perf_record_bpf_event bpf; struct perf_record_ksymbol ksymbol; struct perf_record_text_poke_event text_poke; diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c index fcf44149feb20c35..4c92cc1a952c1d9f 100644 --- a/tools/perf/util/event.c +++ b/tools/perf/util/event.c @@ -61,6 +61,7 @@ static const char *perf_event__names[] = { [PERF_RECORD_CGROUP] = "CGROUP", [PERF_RECORD_TEXT_POKE] = "TEXT_POKE", [PERF_RECORD_AUX_OUTPUT_HW_ID] = "AUX_OUTPUT_HW_ID", + [PERF_RECORD_CALLCHAIN_DEFERRED] = "CALLCHAIN_DEFERRED", [PERF_RECORD_HEADER_ATTR] = "ATTR", [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE", [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA", diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 989c56d4a23f74f4..244b3e44d090d413 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -3089,6 +3089,20 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event, data->data_src = PERF_MEM_DATA_SRC_NONE; data->vcpu = -1; + if (event->header.type == PERF_RECORD_CALLCHAIN_DEFERRED) { + const u64 max_callchain_nr = UINT64_MAX / sizeof(u64); + + data->callchain = (struct ip_callchain *)&event->callchain_deferred.nr; + if (data->callchain->nr > max_callchain_nr) + return -EFAULT; + + data->deferred_cookie = event->callchain_deferred.cookie; + + if (evsel->core.attr.sample_id_all) + perf_evsel__parse_id_sample(evsel, event, data); + return 0; + } + if (event->header.type != PERF_RECORD_SAMPLE) { if (!evsel->core.attr.sample_id_all) return 0; @@ -3219,6 +3233,11 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event, if (data->callchain->nr > max_callchain_nr) return -EFAULT; sz = data->callchain->nr * sizeof(u64); + if (evsel->core.attr.defer_callchain && data->callchain->nr >= 2 && + data->callchain->ips[data->callchain->nr - 2] == PERF_CONTEXT_USER_DEFERRED) { + data->deferred_cookie = data->callchain->ips[data->callchain->nr - 1]; + data->deferred_callchain = true; + } OVERFLOW_CHECK(array, sz, max_size); array = (void *)array + sz; } diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index b5dd42588c916d91..841b711d970e9457 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -2124,6 +2124,7 @@ static int add_callchain_ip(struct thread *thread, *cpumode = PERF_RECORD_MISC_KERNEL; break; case PERF_CONTEXT_USER: + case PERF_CONTEXT_USER_DEFERRED: *cpumode = PERF_RECORD_MISC_USER; break; default: diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c index 66b666d9ce649dd7..741c3d657a8b6ae7 100644 --- a/tools/perf/util/perf_event_attr_fprintf.c +++ b/tools/perf/util/perf_event_attr_fprintf.c @@ -343,6 +343,8 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr, PRINT_ATTRf(inherit_thread, p_unsigned); PRINT_ATTRf(remove_on_exec, p_unsigned); PRINT_ATTRf(sigtrap, p_unsigned); + PRINT_ATTRf(defer_callchain, p_unsigned); + PRINT_ATTRf(defer_output, p_unsigned); PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned, false); PRINT_ATTRf(bp_type, p_unsigned); diff --git a/tools/perf/util/sample.h b/tools/perf/util/sample.h index fae834144ef42105..a8307b20a9ea8066 100644 --- a/tools/perf/util/sample.h +++ b/tools/perf/util/sample.h @@ -107,6 +107,8 @@ struct perf_sample { /** @weight3: On x86 holds retire_lat, on powerpc holds p_stage_cyc. */ u16 weight3; bool no_hw_idx; /* No hw_idx collected in branch_stack */ + bool deferred_callchain; /* Has deferred user callchains */ + u64 deferred_cookie; char insn[MAX_INSN]; void *raw_data; struct ip_callchain *callchain; diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 4b0236b2df2913e1..361e15c1f26a96d0 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -720,6 +720,7 @@ static perf_event__swap_op perf_event__swap_ops[] = { [PERF_RECORD_CGROUP] = perf_event__cgroup_swap, [PERF_RECORD_TEXT_POKE] = perf_event__text_poke_swap, [PERF_RECORD_AUX_OUTPUT_HW_ID] = perf_event__all64_swap, + [PERF_RECORD_CALLCHAIN_DEFERRED] = perf_event__all64_swap, [PERF_RECORD_HEADER_ATTR] = perf_event__hdr_attr_swap, [PERF_RECORD_HEADER_EVENT_TYPE] = perf_event__event_type_swap, [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap, @@ -854,6 +855,9 @@ static void callchain__printf(struct evsel *evsel, for (i = 0; i < callchain->nr; i++) printf("..... %2d: %016" PRIx64 "\n", i, callchain->ips[i]); + + if (sample->deferred_callchain) + printf("...... (deferred)\n"); } static void branch_stack__printf(struct perf_sample *sample, @@ -1123,6 +1127,19 @@ static void dump_sample(struct evsel *evsel, union perf_event *event, sample_read__printf(sample, evsel->core.attr.read_format); } +static void dump_deferred_callchain(struct evsel *evsel, union perf_event *event, + struct perf_sample *sample) +{ + if (!dump_trace) + return; + + printf("(IP, 0x%x): %d/%d: %#" PRIx64 "\n", + event->header.misc, sample->pid, sample->tid, sample->deferred_cookie); + + if (evsel__has_callchain(evsel)) + callchain__printf(evsel, sample); +} + static void dump_read(struct evsel *evsel, union perf_event *event) { struct perf_record_read *read_event = &event->read; @@ -1353,6 +1370,9 @@ static int machines__deliver_event(struct machines *machines, return tool->text_poke(tool, event, sample, machine); case PERF_RECORD_AUX_OUTPUT_HW_ID: return tool->aux_output_hw_id(tool, event, sample, machine); + case PERF_RECORD_CALLCHAIN_DEFERRED: + dump_deferred_callchain(evsel, event, sample); + return tool->callchain_deferred(tool, event, sample, evsel, machine); default: ++evlist->stats.nr_unknown_events; return -1; diff --git a/tools/perf/util/tool.c b/tools/perf/util/tool.c index 22a8a4ffe05f778e..f732d33e7f895ed4 100644 --- a/tools/perf/util/tool.c +++ b/tools/perf/util/tool.c @@ -287,6 +287,7 @@ void perf_tool__init(struct perf_tool *tool, bool ordered_events) tool->read = process_event_sample_stub; tool->throttle = process_event_stub; tool->unthrottle = process_event_stub; + tool->callchain_deferred = process_event_sample_stub; tool->attr = process_event_synth_attr_stub; tool->event_update = process_event_synth_event_update_stub; tool->tracing_data = process_event_synth_tracing_data_stub; diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h index 88337cee1e3e2be3..9b9f0a8cbf3de4b5 100644 --- a/tools/perf/util/tool.h +++ b/tools/perf/util/tool.h @@ -44,7 +44,8 @@ enum show_feature_header { struct perf_tool { event_sample sample, - read; + read, + callchain_deferred; event_op mmap, mmap2, comm, -- 2.52.0.rc1.455.g30608eb744-goog
