Commit | Line | Data |
---|---|---|
1c47910e AS |
1 | /* Copyright (c) 2016 Facebook |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | #include <linux/ptrace.h> | |
8 | #include <linux/version.h> | |
9 | #include <uapi/linux/bpf.h> | |
10 | #include <uapi/linux/bpf_perf_event.h> | |
11 | #include <uapi/linux/perf_event.h> | |
12 | #include "bpf_helpers.h" | |
13 | ||
14 | struct key_t { | |
15 | char comm[TASK_COMM_LEN]; | |
16 | u32 kernstack; | |
17 | u32 userstack; | |
18 | }; | |
19 | ||
20 | struct bpf_map_def SEC("maps") counts = { | |
21 | .type = BPF_MAP_TYPE_HASH, | |
22 | .key_size = sizeof(struct key_t), | |
23 | .value_size = sizeof(u64), | |
24 | .max_entries = 10000, | |
25 | }; | |
26 | ||
27 | struct bpf_map_def SEC("maps") stackmap = { | |
28 | .type = BPF_MAP_TYPE_STACK_TRACE, | |
29 | .key_size = sizeof(u32), | |
30 | .value_size = PERF_MAX_STACK_DEPTH * sizeof(u64), | |
31 | .max_entries = 10000, | |
32 | }; | |
33 | ||
34 | #define KERN_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP) | |
35 | #define USER_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP | BPF_F_USER_STACK) | |
36 | ||
37 | SEC("perf_event") | |
38 | int bpf_prog1(struct bpf_perf_event_data *ctx) | |
39 | { | |
81b9cf80 YS |
40 | char time_fmt1[] = "Time Enabled: %llu, Time Running: %llu"; |
41 | char time_fmt2[] = "Get Time Failed, ErrCode: %d"; | |
12fe1225 | 42 | char addr_fmt[] = "Address recorded on event: %llx"; |
1c47910e AS |
43 | char fmt[] = "CPU-%d period %lld ip %llx"; |
44 | u32 cpu = bpf_get_smp_processor_id(); | |
81b9cf80 | 45 | struct bpf_perf_event_value value_buf; |
1c47910e AS |
46 | struct key_t key; |
47 | u64 *val, one = 1; | |
81b9cf80 | 48 | int ret; |
1c47910e AS |
49 | |
50 | if (ctx->sample_period < 10000) | |
51 | /* ignore warmup */ | |
52 | return 0; | |
53 | bpf_get_current_comm(&key.comm, sizeof(key.comm)); | |
54 | key.kernstack = bpf_get_stackid(ctx, &stackmap, KERN_STACKID_FLAGS); | |
55 | key.userstack = bpf_get_stackid(ctx, &stackmap, USER_STACKID_FLAGS); | |
56 | if ((int)key.kernstack < 0 && (int)key.userstack < 0) { | |
57 | bpf_trace_printk(fmt, sizeof(fmt), cpu, ctx->sample_period, | |
2dbb4c05 | 58 | PT_REGS_IP(&ctx->regs)); |
1c47910e AS |
59 | return 0; |
60 | } | |
61 | ||
81b9cf80 YS |
62 | ret = bpf_perf_prog_read_value(ctx, (void *)&value_buf, sizeof(struct bpf_perf_event_value)); |
63 | if (!ret) | |
64 | bpf_trace_printk(time_fmt1, sizeof(time_fmt1), value_buf.enabled, value_buf.running); | |
65 | else | |
66 | bpf_trace_printk(time_fmt2, sizeof(time_fmt2), ret); | |
67 | ||
12fe1225 TQ |
68 | if (ctx->addr != 0) |
69 | bpf_trace_printk(addr_fmt, sizeof(addr_fmt), ctx->addr); | |
70 | ||
1c47910e AS |
71 | val = bpf_map_lookup_elem(&counts, &key); |
72 | if (val) | |
73 | (*val)++; | |
74 | else | |
75 | bpf_map_update_elem(&counts, &key, &one, BPF_NOEXIST); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | char _license[] SEC("license") = "GPL"; |