projects / linux-2.6-block.git / blame
| 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"; | |
| 1c47910e AS |
42 | char fmt[] = "CPU-%d period %lld ip %llx"; |
| 43 | u32 cpu = bpf_get_smp_processor_id(); | |
| 81b9cf80 | 44 | struct bpf_perf_event_value value_buf; |
| 1c47910e AS |
45 | struct key_t key; |
| 46 | u64 *val, one = 1; | |
| 81b9cf80 | 47 | int ret; |
| 1c47910e AS |
48 | |
| 49 | if (ctx->sample_period < 10000) | |
| 50 | /* ignore warmup */ | |
| 51 | return 0; | |
| 52 | bpf_get_current_comm(&key.comm, sizeof(key.comm)); | |
| 53 | key.kernstack = bpf_get_stackid(ctx, &stackmap, KERN_STACKID_FLAGS); | |
| 54 | key.userstack = bpf_get_stackid(ctx, &stackmap, USER_STACKID_FLAGS); | |
| 55 | if ((int)key.kernstack < 0 && (int)key.userstack < 0) { | |
| 56 | bpf_trace_printk(fmt, sizeof(fmt), cpu, ctx->sample_period, | |
| 2dbb4c05 | 57 | PT_REGS_IP(&ctx->regs)); |
| 1c47910e AS |
58 | return 0; |
| 59 | } | |
| 60 | ||
| 81b9cf80 YS |
61 | ret = bpf_perf_prog_read_value(ctx, (void *)&value_buf, sizeof(struct bpf_perf_event_value)); |
| 62 | if (!ret) | |
| 63 | bpf_trace_printk(time_fmt1, sizeof(time_fmt1), value_buf.enabled, value_buf.running); | |
| 64 | else | |
| 65 | bpf_trace_printk(time_fmt2, sizeof(time_fmt2), ret); | |
| 66 | ||
| 1c47910e AS |
67 | val = bpf_map_lookup_elem(&counts, &key); |
| 68 | if (val) | |
| 69 | (*val)++; | |
| 70 | else | |
| 71 | bpf_map_update_elem(&counts, &key, &one, BPF_NOEXIST); | |
| 72 | return 0; | |
| 73 | } | |
| 74 | ||
| 75 | char _license[] SEC("license") = "GPL"; |