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