415 lines
11 KiB
C
415 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* JSON export.
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*
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* Copyright (C) 2021, CodeWeavers Inc. <nfraser@codeweavers.com>
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*/
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#include "data-convert.h"
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#include <fcntl.h>
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#include <inttypes.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "linux/compiler.h"
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#include "linux/err.h"
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#include "util/auxtrace.h"
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#include "util/debug.h"
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#include "util/dso.h"
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#include "util/event.h"
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#include "util/evsel.h"
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#include "util/evlist.h"
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#include "util/header.h"
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#include "util/map.h"
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#include "util/session.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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#include "util/tool.h"
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#ifdef HAVE_LIBTRACEEVENT
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#include <traceevent/event-parse.h>
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#endif
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struct convert_json {
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struct perf_tool tool;
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FILE *out;
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bool first;
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u64 events_count;
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};
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// Outputs a JSON-encoded string surrounded by quotes with characters escaped.
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static void output_json_string(FILE *out, const char *s)
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{
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fputc('"', out);
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while (*s) {
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switch (*s) {
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// required escapes with special forms as per RFC 8259
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case '"': fputs("\\\"", out); break;
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case '\\': fputs("\\\\", out); break;
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case '\b': fputs("\\b", out); break;
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case '\f': fputs("\\f", out); break;
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case '\n': fputs("\\n", out); break;
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case '\r': fputs("\\r", out); break;
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case '\t': fputs("\\t", out); break;
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default:
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// all other control characters must be escaped by hex code
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if (*s <= 0x1f)
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fprintf(out, "\\u%04x", *s);
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else
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fputc(*s, out);
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break;
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}
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++s;
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}
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fputc('"', out);
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}
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// Outputs an optional comma, newline and indentation to delimit a new value
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// from the previous one in a JSON object or array.
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static void output_json_delimiters(FILE *out, bool comma, int depth)
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{
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int i;
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if (comma)
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fputc(',', out);
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fputc('\n', out);
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for (i = 0; i < depth; ++i)
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fputc('\t', out);
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}
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// Outputs a printf format string (with delimiter) as a JSON value.
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__printf(4, 5)
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static void output_json_format(FILE *out, bool comma, int depth, const char *format, ...)
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{
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va_list args;
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output_json_delimiters(out, comma, depth);
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va_start(args, format);
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vfprintf(out, format, args);
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va_end(args);
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}
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// Outputs a JSON key-value pair where the value is a string.
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static void output_json_key_string(FILE *out, bool comma, int depth,
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const char *key, const char *value)
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{
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output_json_delimiters(out, comma, depth);
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output_json_string(out, key);
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fputs(": ", out);
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output_json_string(out, value);
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}
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// Outputs a JSON key-value pair where the value is a printf format string.
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__printf(5, 6)
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static void output_json_key_format(FILE *out, bool comma, int depth,
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const char *key, const char *format, ...)
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{
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va_list args;
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output_json_delimiters(out, comma, depth);
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output_json_string(out, key);
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fputs(": ", out);
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va_start(args, format);
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vfprintf(out, format, args);
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va_end(args);
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}
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static void output_sample_callchain_entry(struct perf_tool *tool,
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u64 ip, struct addr_location *al)
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{
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struct convert_json *c = container_of(tool, struct convert_json, tool);
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FILE *out = c->out;
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output_json_format(out, false, 4, "{");
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output_json_key_format(out, false, 5, "ip", "\"0x%" PRIx64 "\"", ip);
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if (al && al->sym && al->sym->namelen) {
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fputc(',', out);
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output_json_key_string(out, false, 5, "symbol", al->sym->name);
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if (al->map && al->map->dso) {
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const char *dso = al->map->dso->short_name;
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if (dso && strlen(dso) > 0) {
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fputc(',', out);
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output_json_key_string(out, false, 5, "dso", dso);
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}
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}
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}
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output_json_format(out, false, 4, "}");
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}
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static int process_sample_event(struct perf_tool *tool,
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union perf_event *event __maybe_unused,
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struct perf_sample *sample,
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struct evsel *evsel __maybe_unused,
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struct machine *machine)
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{
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struct convert_json *c = container_of(tool, struct convert_json, tool);
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FILE *out = c->out;
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struct addr_location al, tal;
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u64 sample_type = __evlist__combined_sample_type(evsel->evlist);
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u8 cpumode = PERF_RECORD_MISC_USER;
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if (machine__resolve(machine, &al, sample) < 0) {
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pr_err("Sample resolution failed!\n");
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return -1;
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}
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++c->events_count;
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if (c->first)
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c->first = false;
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else
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fputc(',', out);
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output_json_format(out, false, 2, "{");
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output_json_key_format(out, false, 3, "timestamp", "%" PRIi64, sample->time);
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output_json_key_format(out, true, 3, "pid", "%i", al.thread->pid_);
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output_json_key_format(out, true, 3, "tid", "%i", al.thread->tid);
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if ((sample_type & PERF_SAMPLE_CPU))
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output_json_key_format(out, true, 3, "cpu", "%i", sample->cpu);
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else if (al.thread->cpu >= 0)
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output_json_key_format(out, true, 3, "cpu", "%i", al.thread->cpu);
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output_json_key_string(out, true, 3, "comm", thread__comm_str(al.thread));
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output_json_key_format(out, true, 3, "callchain", "[");
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if (sample->callchain) {
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unsigned int i;
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bool ok;
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bool first_callchain = true;
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for (i = 0; i < sample->callchain->nr; ++i) {
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u64 ip = sample->callchain->ips[i];
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if (ip >= PERF_CONTEXT_MAX) {
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switch (ip) {
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case PERF_CONTEXT_HV:
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cpumode = PERF_RECORD_MISC_HYPERVISOR;
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break;
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case PERF_CONTEXT_KERNEL:
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cpumode = PERF_RECORD_MISC_KERNEL;
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break;
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case PERF_CONTEXT_USER:
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cpumode = PERF_RECORD_MISC_USER;
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break;
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default:
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pr_debug("invalid callchain context: %"
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PRId64 "\n", (s64) ip);
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break;
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}
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continue;
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}
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if (first_callchain)
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first_callchain = false;
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else
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fputc(',', out);
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ok = thread__find_symbol(al.thread, cpumode, ip, &tal);
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output_sample_callchain_entry(tool, ip, ok ? &tal : NULL);
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}
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} else {
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output_sample_callchain_entry(tool, sample->ip, &al);
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}
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output_json_format(out, false, 3, "]");
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#ifdef HAVE_LIBTRACEEVENT
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if (sample->raw_data) {
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int i;
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struct tep_format_field **fields;
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fields = tep_event_fields(evsel->tp_format);
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if (fields) {
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i = 0;
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while (fields[i]) {
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struct trace_seq s;
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trace_seq_init(&s);
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tep_print_field(&s, sample->raw_data, fields[i]);
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output_json_key_string(out, true, 3, fields[i]->name, s.buffer);
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i++;
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}
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free(fields);
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}
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}
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#endif
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output_json_format(out, false, 2, "}");
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return 0;
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}
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static void output_headers(struct perf_session *session, struct convert_json *c)
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{
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struct stat st;
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struct perf_header *header = &session->header;
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int ret;
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int fd = perf_data__fd(session->data);
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int i;
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FILE *out = c->out;
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output_json_key_format(out, false, 2, "header-version", "%u", header->version);
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ret = fstat(fd, &st);
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if (ret >= 0) {
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time_t stctime = st.st_mtime;
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char buf[256];
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strftime(buf, sizeof(buf), "%FT%TZ", gmtime(&stctime));
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output_json_key_string(out, true, 2, "captured-on", buf);
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} else {
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pr_debug("Failed to get mtime of source file, not writing captured-on");
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}
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output_json_key_format(out, true, 2, "data-offset", "%" PRIu64, header->data_offset);
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output_json_key_format(out, true, 2, "data-size", "%" PRIu64, header->data_size);
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output_json_key_format(out, true, 2, "feat-offset", "%" PRIu64, header->feat_offset);
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output_json_key_string(out, true, 2, "hostname", header->env.hostname);
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output_json_key_string(out, true, 2, "os-release", header->env.os_release);
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output_json_key_string(out, true, 2, "arch", header->env.arch);
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output_json_key_string(out, true, 2, "cpu-desc", header->env.cpu_desc);
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output_json_key_string(out, true, 2, "cpuid", header->env.cpuid);
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output_json_key_format(out, true, 2, "nrcpus-online", "%u", header->env.nr_cpus_online);
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output_json_key_format(out, true, 2, "nrcpus-avail", "%u", header->env.nr_cpus_avail);
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if (header->env.clock.enabled) {
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output_json_key_format(out, true, 2, "clockid",
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"%u", header->env.clock.clockid);
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output_json_key_format(out, true, 2, "clock-time",
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"%" PRIu64, header->env.clock.clockid_ns);
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output_json_key_format(out, true, 2, "real-time",
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"%" PRIu64, header->env.clock.tod_ns);
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}
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output_json_key_string(out, true, 2, "perf-version", header->env.version);
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output_json_key_format(out, true, 2, "cmdline", "[");
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for (i = 0; i < header->env.nr_cmdline; i++) {
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output_json_delimiters(out, i != 0, 3);
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output_json_string(c->out, header->env.cmdline_argv[i]);
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}
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output_json_format(out, false, 2, "]");
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}
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int bt_convert__perf2json(const char *input_name, const char *output_name,
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struct perf_data_convert_opts *opts __maybe_unused)
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{
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struct perf_session *session;
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int fd;
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int ret = -1;
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struct convert_json c = {
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.tool = {
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.sample = process_sample_event,
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.mmap = perf_event__process_mmap,
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.mmap2 = perf_event__process_mmap2,
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.comm = perf_event__process_comm,
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.namespaces = perf_event__process_namespaces,
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.cgroup = perf_event__process_cgroup,
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.exit = perf_event__process_exit,
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.fork = perf_event__process_fork,
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.lost = perf_event__process_lost,
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#ifdef HAVE_LIBTRACEEVENT
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.tracing_data = perf_event__process_tracing_data,
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#endif
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.build_id = perf_event__process_build_id,
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.id_index = perf_event__process_id_index,
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.auxtrace_info = perf_event__process_auxtrace_info,
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.auxtrace = perf_event__process_auxtrace,
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.event_update = perf_event__process_event_update,
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.ordered_events = true,
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.ordering_requires_timestamps = true,
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},
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.first = true,
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.events_count = 0,
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};
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struct perf_data data = {
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.mode = PERF_DATA_MODE_READ,
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.path = input_name,
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.force = opts->force,
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};
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if (opts->all) {
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pr_err("--all is currently unsupported for JSON output.\n");
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goto err;
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}
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if (opts->tod) {
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pr_err("--tod is currently unsupported for JSON output.\n");
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goto err;
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}
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fd = open(output_name, O_CREAT | O_WRONLY | (opts->force ? O_TRUNC : O_EXCL), 0666);
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if (fd == -1) {
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if (errno == EEXIST)
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pr_err("Output file exists. Use --force to overwrite it.\n");
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else
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pr_err("Error opening output file!\n");
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goto err;
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}
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c.out = fdopen(fd, "w");
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if (!c.out) {
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fprintf(stderr, "Error opening output file!\n");
|
||
|
|
close(fd);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
session = perf_session__new(&data, &c.tool);
|
||
|
|
if (IS_ERR(session)) {
|
||
|
|
fprintf(stderr, "Error creating perf session!\n");
|
||
|
|
goto err_fclose;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (symbol__init(&session->header.env) < 0) {
|
||
|
|
fprintf(stderr, "Symbol init error!\n");
|
||
|
|
goto err_session_delete;
|
||
|
|
}
|
||
|
|
|
||
|
|
// The opening brace is printed manually because it isn't delimited from a
|
||
|
|
// previous value (i.e. we don't want a leading newline)
|
||
|
|
fputc('{', c.out);
|
||
|
|
|
||
|
|
// Version number for future-proofing. Most additions should be able to be
|
||
|
|
// done in a backwards-compatible way so this should only need to be bumped
|
||
|
|
// if some major breaking change must be made.
|
||
|
|
output_json_format(c.out, false, 1, "\"linux-perf-json-version\": 1");
|
||
|
|
|
||
|
|
// Output headers
|
||
|
|
output_json_format(c.out, true, 1, "\"headers\": {");
|
||
|
|
output_headers(session, &c);
|
||
|
|
output_json_format(c.out, false, 1, "}");
|
||
|
|
|
||
|
|
// Output samples
|
||
|
|
output_json_format(c.out, true, 1, "\"samples\": [");
|
||
|
|
perf_session__process_events(session);
|
||
|
|
output_json_format(c.out, false, 1, "]");
|
||
|
|
output_json_format(c.out, false, 0, "}");
|
||
|
|
fputc('\n', c.out);
|
||
|
|
|
||
|
|
fprintf(stderr,
|
||
|
|
"[ perf data convert: Converted '%s' into JSON data '%s' ]\n",
|
||
|
|
data.path, output_name);
|
||
|
|
|
||
|
|
fprintf(stderr,
|
||
|
|
"[ perf data convert: Converted and wrote %.3f MB (%" PRIu64 " samples) ]\n",
|
||
|
|
(ftell(c.out)) / 1024.0 / 1024.0, c.events_count);
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
err_session_delete:
|
||
|
|
perf_session__delete(session);
|
||
|
|
err_fclose:
|
||
|
|
fclose(c.out);
|
||
|
|
err:
|
||
|
|
return ret;
|
||
|
|
}
|