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384 lines
10 KiB
384 lines
10 KiB
// 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. <[email protected]> |
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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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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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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 (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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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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.tracing_data = perf_event__process_tracing_data, |
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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"); |
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close(fd); |
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goto err; |
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} |
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session = perf_session__new(&data, &c.tool); |
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if (IS_ERR(session)) { |
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fprintf(stderr, "Error creating perf session!\n"); |
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goto err_fclose; |
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} |
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if (symbol__init(&session->header.env) < 0) { |
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fprintf(stderr, "Symbol init error!\n"); |
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goto err_session_delete; |
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} |
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// The opening brace is printed manually because it isn't delimited from a |
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// previous value (i.e. we don't want a leading newline) |
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fputc('{', c.out); |
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// Version number for future-proofing. Most additions should be able to be |
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// done in a backwards-compatible way so this should only need to be bumped |
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// if some major breaking change must be made. |
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output_json_format(c.out, false, 1, "\"linux-perf-json-version\": 1"); |
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// Output headers |
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output_json_format(c.out, true, 1, "\"headers\": {"); |
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output_headers(session, &c); |
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output_json_format(c.out, false, 1, "}"); |
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// Output samples |
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output_json_format(c.out, true, 1, "\"samples\": ["); |
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perf_session__process_events(session); |
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output_json_format(c.out, false, 1, "]"); |
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output_json_format(c.out, false, 0, "}"); |
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fputc('\n', c.out); |
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fprintf(stderr, |
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"[ perf data convert: Converted '%s' into JSON data '%s' ]\n", |
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data.path, output_name); |
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fprintf(stderr, |
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"[ perf data convert: Converted and wrote %.3f MB (%" PRIu64 " samples) ]\n", |
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(ftell(c.out)) / 1024.0 / 1024.0, c.events_count); |
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ret = 0; |
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err_session_delete: |
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perf_session__delete(session); |
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err_fclose: |
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fclose(c.out); |
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err: |
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return ret; |
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}
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