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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include "data-convert.h"
#include <fcntl.h>#include <inttypes.h>#include <sys/stat.h>#include <unistd.h>
#include "linux/compiler.h"#include "linux/err.h"#include "util/auxtrace.h"#include "util/debug.h"#include "util/env.h"#include "util/dso.h"#include "util/event.h"#include "util/evsel.h"#include "util/evlist.h"#include "util/header.h"#include "util/map.h"#include "util/session.h"#include "util/symbol.h"#include "util/thread.h"#include "util/time-utils.h"#include "util/tool.h"
#ifdef HAVE_LIBTRACEEVENT#include <event-parse.h>#endif
struct convert_json { struct perf_tool tool; FILE *out; bool first; struct perf_time_interval *ptime_range; int range_size; int range_num;
u64 events_count; u64 skipped;};
// Outputs a JSON-encoded string surrounded by quotes with characters escaped.static void output_json_string(FILE *out, const char *s){ fputc('"', out); if (!s) goto out;
while (*s) { switch (*s) {
// required escapes with special forms as per RFC 8259 case '"': fputs("\\\"", out); break; case '\\': fputs("\\\\", out); break; case '\b': fputs("\\b", out); break; case '\f': fputs("\\f", out); break; case '\n': fputs("\\n", out); break; case '\r': fputs("\\r", out); break; case '\t': fputs("\\t", out); break;
default: // all other control characters must be escaped by hex code if (*s <= 0x1f) fprintf(out, "\\u%04x", *s); else fputc(*s, out); break; }
++s; }out: fputc('"', out);}
// Outputs an optional comma, newline and indentation to delimit a new value// from the previous one in a JSON object or array.static void output_json_delimiters(FILE *out, bool comma, int depth){ int i;
if (comma) fputc(',', out); fputc('\n', out); for (i = 0; i < depth; ++i) fputc('\t', out);}
// Outputs a printf format string (with delimiter) as a JSON value.__printf(4, 5)static void output_json_format(FILE *out, bool comma, int depth, const char *format, ...){ va_list args;
output_json_delimiters(out, comma, depth); va_start(args, format); vfprintf(out, format, args); va_end(args);}
// Outputs a JSON key-value pair where the value is a string.static void output_json_key_string(FILE *out, bool comma, int depth, const char *key, const char *value){ output_json_delimiters(out, comma, depth); output_json_string(out, key); fputs(": ", out); output_json_string(out, value);}
// Outputs a JSON key-value pair where the value is a printf format string.__printf(5, 6)static void output_json_key_format(FILE *out, bool comma, int depth, const char *key, const char *format, ...){ va_list args;
output_json_delimiters(out, comma, depth); output_json_string(out, key); fputs(": ", out); va_start(args, format); vfprintf(out, format, args); va_end(args);}
static void output_sample_callchain_entry(const struct perf_tool *tool, u64 ip, struct addr_location *al){ struct convert_json *c = container_of(tool, struct convert_json, tool); FILE *out = c->out;
output_json_format(out, false, 4, "{"); output_json_key_format(out, false, 5, "ip", "\"0x%" PRIx64 "\"", ip);
if (al && al->sym && al->sym->namelen) { struct dso *dso = al->map ? map__dso(al->map) : NULL;
fputc(',', out); output_json_key_string(out, false, 5, "symbol", al->sym->name);
if (dso) { const char *dso_name = dso__short_name(dso);
if (dso_name && strlen(dso_name) > 0) { fputc(',', out); output_json_key_string(out, false, 5, "dso", dso_name); } } }
output_json_format(out, false, 4, "}");}
static int process_sample_event(const struct perf_tool *tool, union perf_event *event __maybe_unused, struct perf_sample *sample, struct machine *machine){ struct convert_json *c = container_of(tool, struct convert_json, tool); FILE *out = c->out; struct addr_location al; u64 sample_type = __evlist__combined_sample_type(sample->evsel->evlist); u8 cpumode = PERF_RECORD_MISC_USER;
addr_location__init(&al); if (machine__resolve(machine, &al, sample) < 0) { pr_err("Sample resolution failed!\n"); addr_location__exit(&al); return -1; }
if (perf_time__ranges_skip_sample(c->ptime_range, c->range_num, sample->time)) { ++c->skipped; addr_location__exit(&al); return 0; }
++c->events_count;
if (c->first) c->first = false; else fputc(',', out); output_json_format(out, false, 2, "{");
output_json_key_format(out, false, 3, "timestamp", "%" PRIi64, sample->time); output_json_key_format(out, true, 3, "pid", "%i", thread__pid(al.thread)); output_json_key_format(out, true, 3, "tid", "%i", thread__tid(al.thread));
if ((sample_type & PERF_SAMPLE_CPU)) output_json_key_format(out, true, 3, "cpu", "%i", sample->cpu); else if (thread__cpu(al.thread) >= 0) output_json_key_format(out, true, 3, "cpu", "%i", thread__cpu(al.thread));
output_json_key_string(out, true, 3, "comm", thread__comm_str(al.thread));
output_json_key_format(out, true, 3, "callchain", "["); if (sample->callchain) { unsigned int i; bool ok; bool first_callchain = true;
for (i = 0; i < sample->callchain->nr; ++i) { u64 ip = sample->callchain->ips[i]; struct addr_location tal;
if (ip >= PERF_CONTEXT_MAX) { switch (ip) { case PERF_CONTEXT_HV: cpumode = PERF_RECORD_MISC_HYPERVISOR; break; case PERF_CONTEXT_KERNEL: cpumode = PERF_RECORD_MISC_KERNEL; break; case PERF_CONTEXT_USER: cpumode = PERF_RECORD_MISC_USER; break; default: pr_debug("invalid callchain context: %" PRId64 "\n", (s64) ip); break; } continue; }
if (first_callchain) first_callchain = false; else fputc(',', out);
addr_location__init(&tal); ok = thread__find_symbol(al.thread, cpumode, ip, &tal); output_sample_callchain_entry(tool, ip, ok ? &tal : NULL); addr_location__exit(&tal); } } else { output_sample_callchain_entry(tool, sample->ip, &al); } output_json_format(out, false, 3, "]");
#ifdef HAVE_LIBTRACEEVENT if (sample->raw_data) { struct tep_event *tp_format = evsel__tp_format(sample->evsel); struct tep_format_field **fields = tp_format ? tep_event_fields(tp_format) : NULL;
if (fields) { int i = 0;
while (fields[i]) { struct trace_seq s;
trace_seq_init(&s); tep_print_field(&s, sample->raw_data, fields[i]); output_json_key_string(out, true, 3, fields[i]->name, s.buffer); trace_seq_destroy(&s);
i++; } free(fields); } }#endif output_json_format(out, false, 2, "}"); addr_location__exit(&al); return 0;}
static void output_headers(struct perf_session *session, struct convert_json *c){ struct stat st; const struct perf_header *header = &session->header; struct perf_env *env = perf_session__env(session); int ret; int fd = perf_data__fd(session->data); int i; FILE *out = c->out;
output_json_key_format(out, false, 2, "header-version", "%u", header->version);
ret = fstat(fd, &st); if (ret >= 0) { time_t stctime = st.st_mtime; char buf[256];
strftime(buf, sizeof(buf), "%FT%TZ", gmtime(&stctime)); output_json_key_string(out, true, 2, "captured-on", buf); } else { pr_debug("Failed to get mtime of source file, not writing captured-on"); }
output_json_key_format(out, true, 2, "data-offset", "%" PRIu64, header->data_offset); output_json_key_format(out, true, 2, "data-size", "%" PRIu64, header->data_size); output_json_key_format(out, true, 2, "feat-offset", "%" PRIu64, header->feat_offset);
output_json_key_string(out, true, 2, "hostname", env->hostname); output_json_key_string(out, true, 2, "os-release", perf_env__os_release(env)); output_json_key_string(out, true, 2, "arch", env->arch);
if (env->cpu_desc) output_json_key_string(out, true, 2, "cpu-desc", env->cpu_desc);
output_json_key_string(out, true, 2, "cpuid", env->cpuid); output_json_key_format(out, true, 2, "nrcpus-online", "%u", env->nr_cpus_online); output_json_key_format(out, true, 2, "nrcpus-avail", "%u", env->nr_cpus_avail);
if (env->clock.enabled) { output_json_key_format(out, true, 2, "clockid", "%u", env->clock.clockid); output_json_key_format(out, true, 2, "clock-time", "%" PRIu64, env->clock.clockid_ns); output_json_key_format(out, true, 2, "real-time", "%" PRIu64, env->clock.tod_ns); }
output_json_key_string(out, true, 2, "perf-version", env->version);
output_json_key_format(out, true, 2, "cmdline", "["); for (i = 0; i < env->nr_cmdline; i++) { output_json_delimiters(out, i != 0, 3); output_json_string(c->out, env->cmdline_argv[i]); } output_json_format(out, false, 2, "]");}
int bt_convert__perf2json(const char *_input_name, const char *output_name, struct perf_data_convert_opts *opts __maybe_unused){ struct perf_session *session; int fd; int ret = -1; struct convert_json c = { .first = true, .events_count = 0, .ptime_range = NULL, .range_size = 0, .range_num = 0, .skipped = 0, }; struct perf_data data = { .mode = PERF_DATA_MODE_READ, .path = _input_name, .force = opts->force, };
perf_tool__init(&c.tool, /*ordered_events=*/true); c.tool.sample = process_sample_event; c.tool.mmap = perf_event__process_mmap; c.tool.mmap2 = perf_event__process_mmap2; c.tool.comm = perf_event__process_comm; c.tool.namespaces = perf_event__process_namespaces; c.tool.cgroup = perf_event__process_cgroup; c.tool.exit = perf_event__process_exit; c.tool.fork = perf_event__process_fork; c.tool.lost = perf_event__process_lost;#ifdef HAVE_LIBTRACEEVENT c.tool.tracing_data = perf_event__process_tracing_data;#endif c.tool.build_id = perf_event__process_build_id; c.tool.id_index = perf_event__process_id_index; c.tool.auxtrace_info = perf_event__process_auxtrace_info; c.tool.auxtrace = perf_event__process_auxtrace; c.tool.event_update = perf_event__process_event_update; c.tool.attr = perf_event__process_attr; c.tool.feature = perf_event__process_feature; c.tool.ordering_requires_timestamps = true;
if (opts->all) { pr_err("--all is currently unsupported for JSON output.\n"); goto err; } if (opts->tod) { pr_err("--tod is currently unsupported for JSON output.\n"); goto err; }
fd = open(output_name, O_CREAT | O_WRONLY | (opts->force ? O_TRUNC : O_EXCL), 0666); if (fd == -1) { if (errno == EEXIST) pr_err("Output file exists. Use --force to overwrite it.\n"); else pr_err("Error opening output file!\n"); goto err; }
c.out = fdopen(fd, "w"); if (!c.out) { 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(perf_session__env(session)) < 0) { fprintf(stderr, "Symbol init error!\n"); goto err_session_delete; }
if (opts->time_str) { ret = perf_time__parse_for_ranges(opts->time_str, session, &c.ptime_range, &c.range_size, &c.range_num); if (ret < 0) 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);
if (c.skipped) { fprintf(stderr, "[ perf data convert: Skipped %" PRIu64 " samples ]\n", c.skipped); }
ret = 0;
if (c.ptime_range) zfree(&c.ptime_range);
err_session_delete: perf_session__delete(session);err_fclose: fclose(c.out);err: return ret;}