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238 lines
5.1 KiB
238 lines
5.1 KiB
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
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/* Copyright (C) 2018 Netronome Systems, Inc. */ |
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/* This program is free software; you can redistribute it and/or |
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* modify it under the terms of version 2 of the GNU General Public |
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* License as published by the Free Software Foundation. |
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*/ |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <bpf/libbpf.h> |
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#include <poll.h> |
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#include <signal.h> |
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#include <stdbool.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <time.h> |
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#include <unistd.h> |
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#include <linux/bpf.h> |
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#include <linux/perf_event.h> |
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#include <sys/ioctl.h> |
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#include <sys/mman.h> |
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#include <sys/syscall.h> |
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#include <bpf/bpf.h> |
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#include <perf-sys.h> |
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#include "main.h" |
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#define MMAP_PAGE_CNT 16 |
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static volatile bool stop; |
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struct event_ring_info { |
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int fd; |
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int key; |
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unsigned int cpu; |
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void *mem; |
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}; |
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struct perf_event_sample { |
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struct perf_event_header header; |
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__u64 time; |
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__u32 size; |
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unsigned char data[]; |
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}; |
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struct perf_event_lost { |
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struct perf_event_header header; |
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__u64 id; |
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__u64 lost; |
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}; |
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static void int_exit(int signo) |
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{ |
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fprintf(stderr, "Stopping...\n"); |
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stop = true; |
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} |
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struct event_pipe_ctx { |
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bool all_cpus; |
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int cpu; |
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int idx; |
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}; |
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static enum bpf_perf_event_ret |
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print_bpf_output(void *private_data, int cpu, struct perf_event_header *event) |
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{ |
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struct perf_event_sample *e = container_of(event, |
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struct perf_event_sample, |
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header); |
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struct perf_event_lost *lost = container_of(event, |
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struct perf_event_lost, |
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header); |
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struct event_pipe_ctx *ctx = private_data; |
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int idx = ctx->all_cpus ? cpu : ctx->idx; |
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if (json_output) { |
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jsonw_start_object(json_wtr); |
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jsonw_name(json_wtr, "type"); |
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jsonw_uint(json_wtr, e->header.type); |
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jsonw_name(json_wtr, "cpu"); |
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jsonw_uint(json_wtr, cpu); |
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jsonw_name(json_wtr, "index"); |
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jsonw_uint(json_wtr, idx); |
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if (e->header.type == PERF_RECORD_SAMPLE) { |
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jsonw_name(json_wtr, "timestamp"); |
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jsonw_uint(json_wtr, e->time); |
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jsonw_name(json_wtr, "data"); |
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print_data_json(e->data, e->size); |
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} else if (e->header.type == PERF_RECORD_LOST) { |
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jsonw_name(json_wtr, "lost"); |
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jsonw_start_object(json_wtr); |
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jsonw_name(json_wtr, "id"); |
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jsonw_uint(json_wtr, lost->id); |
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jsonw_name(json_wtr, "count"); |
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jsonw_uint(json_wtr, lost->lost); |
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jsonw_end_object(json_wtr); |
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} |
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jsonw_end_object(json_wtr); |
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} else { |
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if (e->header.type == PERF_RECORD_SAMPLE) { |
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printf("== @%lld.%09lld CPU: %d index: %d =====\n", |
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e->time / 1000000000ULL, e->time % 1000000000ULL, |
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cpu, idx); |
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fprint_hex(stdout, e->data, e->size, " "); |
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printf("\n"); |
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} else if (e->header.type == PERF_RECORD_LOST) { |
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printf("lost %lld events\n", lost->lost); |
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} else { |
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printf("unknown event type=%d size=%d\n", |
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e->header.type, e->header.size); |
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} |
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} |
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return LIBBPF_PERF_EVENT_CONT; |
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} |
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int do_event_pipe(int argc, char **argv) |
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{ |
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struct perf_event_attr perf_attr = { |
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.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_TIME, |
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.type = PERF_TYPE_SOFTWARE, |
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.config = PERF_COUNT_SW_BPF_OUTPUT, |
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.sample_period = 1, |
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.wakeup_events = 1, |
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}; |
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struct bpf_map_info map_info = {}; |
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struct perf_buffer_raw_opts opts = {}; |
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struct event_pipe_ctx ctx = { |
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.all_cpus = true, |
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.cpu = -1, |
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.idx = -1, |
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}; |
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struct perf_buffer *pb; |
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__u32 map_info_len; |
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int err, map_fd; |
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map_info_len = sizeof(map_info); |
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map_fd = map_parse_fd_and_info(&argc, &argv, &map_info, &map_info_len); |
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if (map_fd < 0) |
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return -1; |
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if (map_info.type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) { |
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p_err("map is not a perf event array"); |
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goto err_close_map; |
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} |
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while (argc) { |
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if (argc < 2) { |
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BAD_ARG(); |
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goto err_close_map; |
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} |
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if (is_prefix(*argv, "cpu")) { |
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char *endptr; |
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NEXT_ARG(); |
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ctx.cpu = strtoul(*argv, &endptr, 0); |
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if (*endptr) { |
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p_err("can't parse %s as CPU ID", *argv); |
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goto err_close_map; |
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} |
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NEXT_ARG(); |
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} else if (is_prefix(*argv, "index")) { |
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char *endptr; |
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NEXT_ARG(); |
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ctx.idx = strtoul(*argv, &endptr, 0); |
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if (*endptr) { |
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p_err("can't parse %s as index", *argv); |
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goto err_close_map; |
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} |
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NEXT_ARG(); |
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} else { |
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BAD_ARG(); |
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goto err_close_map; |
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} |
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ctx.all_cpus = false; |
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} |
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if (!ctx.all_cpus) { |
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if (ctx.idx == -1 || ctx.cpu == -1) { |
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p_err("cpu and index must be specified together"); |
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goto err_close_map; |
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} |
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} else { |
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ctx.cpu = 0; |
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ctx.idx = 0; |
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} |
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opts.attr = &perf_attr; |
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opts.event_cb = print_bpf_output; |
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opts.ctx = &ctx; |
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opts.cpu_cnt = ctx.all_cpus ? 0 : 1; |
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opts.cpus = &ctx.cpu; |
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opts.map_keys = &ctx.idx; |
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pb = perf_buffer__new_raw(map_fd, MMAP_PAGE_CNT, &opts); |
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err = libbpf_get_error(pb); |
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if (err) { |
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p_err("failed to create perf buffer: %s (%d)", |
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strerror(err), err); |
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goto err_close_map; |
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} |
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signal(SIGINT, int_exit); |
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signal(SIGHUP, int_exit); |
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signal(SIGTERM, int_exit); |
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if (json_output) |
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jsonw_start_array(json_wtr); |
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while (!stop) { |
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err = perf_buffer__poll(pb, 200); |
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if (err < 0 && err != -EINTR) { |
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p_err("perf buffer polling failed: %s (%d)", |
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strerror(err), err); |
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goto err_close_pb; |
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} |
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} |
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if (json_output) |
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jsonw_end_array(json_wtr); |
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perf_buffer__free(pb); |
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close(map_fd); |
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return 0; |
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err_close_pb: |
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perf_buffer__free(pb); |
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err_close_map: |
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close(map_fd); |
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return -1; |
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}
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