80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* Copyright (c) 2016 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/ptrace.h>
|
|
#include <linux/version.h>
|
|
#include <uapi/linux/bpf.h>
|
|
#include <uapi/linux/bpf_perf_event.h>
|
|
#include <uapi/linux/perf_event.h>
|
|
#include "bpf_helpers.h"
|
|
|
|
struct key_t {
|
|
char comm[TASK_COMM_LEN];
|
|
u32 kernstack;
|
|
u32 userstack;
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") counts = {
|
|
.type = BPF_MAP_TYPE_HASH,
|
|
.key_size = sizeof(struct key_t),
|
|
.value_size = sizeof(u64),
|
|
.max_entries = 10000,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") stackmap = {
|
|
.type = BPF_MAP_TYPE_STACK_TRACE,
|
|
.key_size = sizeof(u32),
|
|
.value_size = PERF_MAX_STACK_DEPTH * sizeof(u64),
|
|
.max_entries = 10000,
|
|
};
|
|
|
|
#define KERN_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP)
|
|
#define USER_STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP | BPF_F_USER_STACK)
|
|
|
|
SEC("perf_event")
|
|
int bpf_prog1(struct bpf_perf_event_data *ctx)
|
|
{
|
|
char time_fmt1[] = "Time Enabled: %llu, Time Running: %llu";
|
|
char time_fmt2[] = "Get Time Failed, ErrCode: %d";
|
|
char addr_fmt[] = "Address recorded on event: %llx";
|
|
char fmt[] = "CPU-%d period %lld ip %llx";
|
|
u32 cpu = bpf_get_smp_processor_id();
|
|
struct bpf_perf_event_value value_buf;
|
|
struct key_t key;
|
|
u64 *val, one = 1;
|
|
int ret;
|
|
|
|
if (ctx->sample_period < 10000)
|
|
/* ignore warmup */
|
|
return 0;
|
|
bpf_get_current_comm(&key.comm, sizeof(key.comm));
|
|
key.kernstack = bpf_get_stackid(ctx, &stackmap, KERN_STACKID_FLAGS);
|
|
key.userstack = bpf_get_stackid(ctx, &stackmap, USER_STACKID_FLAGS);
|
|
if ((int)key.kernstack < 0 && (int)key.userstack < 0) {
|
|
bpf_trace_printk(fmt, sizeof(fmt), cpu, ctx->sample_period,
|
|
PT_REGS_IP(&ctx->regs));
|
|
return 0;
|
|
}
|
|
|
|
ret = bpf_perf_prog_read_value(ctx, (void *)&value_buf, sizeof(struct bpf_perf_event_value));
|
|
if (!ret)
|
|
bpf_trace_printk(time_fmt1, sizeof(time_fmt1), value_buf.enabled, value_buf.running);
|
|
else
|
|
bpf_trace_printk(time_fmt2, sizeof(time_fmt2), ret);
|
|
|
|
if (ctx->addr != 0)
|
|
bpf_trace_printk(addr_fmt, sizeof(addr_fmt), ctx->addr);
|
|
|
|
val = bpf_map_lookup_elem(&counts, &key);
|
|
if (val)
|
|
(*val)++;
|
|
else
|
|
bpf_map_update_elem(&counts, &key, &one, BPF_NOEXIST);
|
|
return 0;
|
|
}
|
|
|
|
char _license[] SEC("license") = "GPL";
|