]>
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 | { | |
40 | char fmt[] = "CPU-%d period %lld ip %llx"; | |
41 | u32 cpu = bpf_get_smp_processor_id(); | |
42 | struct key_t key; | |
43 | u64 *val, one = 1; | |
44 | ||
45 | if (ctx->sample_period < 10000) | |
46 | /* ignore warmup */ | |
47 | return 0; | |
48 | bpf_get_current_comm(&key.comm, sizeof(key.comm)); | |
49 | key.kernstack = bpf_get_stackid(ctx, &stackmap, KERN_STACKID_FLAGS); | |
50 | key.userstack = bpf_get_stackid(ctx, &stackmap, USER_STACKID_FLAGS); | |
51 | if ((int)key.kernstack < 0 && (int)key.userstack < 0) { | |
52 | bpf_trace_printk(fmt, sizeof(fmt), cpu, ctx->sample_period, | |
2dbb4c05 | 53 | PT_REGS_IP(&ctx->regs)); |
1c47910e AS |
54 | return 0; |
55 | } | |
56 | ||
57 | val = bpf_map_lookup_elem(&counts, &key); | |
58 | if (val) | |
59 | (*val)++; | |
60 | else | |
61 | bpf_map_update_elem(&counts, &key, &one, BPF_NOEXIST); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | char _license[] SEC("license") = "GPL"; |