forked from Minki/linux
7cf245a37e
Fix all files in samples/bpf to include libbpf header files with the bpf/
prefix, to be consistent with external users of the library. Also ensure
that all includes of exported libbpf header files (those that are exported
on 'make install' of the library) use bracketed includes instead of quoted.
To make sure no new files are introduced that doesn't include the bpf/
prefix in its include, remove tools/lib/bpf from the include path entirely,
and use tools/lib instead.
Fixes: 6910d7d386 ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk
125 lines
2.4 KiB
C
125 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2016 Facebook
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <linux/bpf.h>
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#include <string.h>
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#include <linux/perf_event.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <sys/resource.h>
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#include <bpf/libbpf.h>
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#include "bpf_load.h"
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#include "trace_helpers.h"
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#define PRINT_RAW_ADDR 0
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static void print_ksym(__u64 addr)
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{
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struct ksym *sym;
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if (!addr)
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return;
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sym = ksym_search(addr);
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if (!sym) {
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printf("ksym not found. Is kallsyms loaded?\n");
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return;
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}
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if (PRINT_RAW_ADDR)
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printf("%s/%llx;", sym->name, addr);
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else
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printf("%s;", sym->name);
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}
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#define TASK_COMM_LEN 16
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struct key_t {
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char waker[TASK_COMM_LEN];
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char target[TASK_COMM_LEN];
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__u32 wret;
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__u32 tret;
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};
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static void print_stack(struct key_t *key, __u64 count)
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{
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__u64 ip[PERF_MAX_STACK_DEPTH] = {};
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static bool warned;
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int i;
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printf("%s;", key->target);
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if (bpf_map_lookup_elem(map_fd[3], &key->tret, ip) != 0) {
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printf("---;");
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} else {
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for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
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print_ksym(ip[i]);
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}
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printf("-;");
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if (bpf_map_lookup_elem(map_fd[3], &key->wret, ip) != 0) {
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printf("---;");
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} else {
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for (i = 0; i < PERF_MAX_STACK_DEPTH; i++)
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print_ksym(ip[i]);
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}
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printf(";%s %lld\n", key->waker, count);
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if ((key->tret == -EEXIST || key->wret == -EEXIST) && !warned) {
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printf("stackmap collisions seen. Consider increasing size\n");
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warned = true;
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} else if (((int)(key->tret) < 0 || (int)(key->wret) < 0)) {
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printf("err stackid %d %d\n", key->tret, key->wret);
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}
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}
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static void print_stacks(int fd)
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{
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struct key_t key = {}, next_key;
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__u64 value;
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while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
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bpf_map_lookup_elem(fd, &next_key, &value);
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print_stack(&next_key, value);
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key = next_key;
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}
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}
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static void int_exit(int sig)
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{
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print_stacks(map_fd[0]);
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exit(0);
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}
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int main(int argc, char **argv)
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{
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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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char filename[256];
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int delay = 1;
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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setrlimit(RLIMIT_MEMLOCK, &r);
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signal(SIGINT, int_exit);
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signal(SIGTERM, int_exit);
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if (load_kallsyms()) {
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printf("failed to process /proc/kallsyms\n");
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return 2;
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}
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if (load_bpf_file(filename)) {
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printf("%s", bpf_log_buf);
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return 1;
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}
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if (argc > 1)
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delay = atoi(argv[1]);
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sleep(delay);
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print_stacks(map_fd[0]);
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return 0;
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}
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