60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#ifndef PERF_MAX_STACK_DEPTH
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#define PERF_MAX_STACK_DEPTH 127
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#endif
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typedef __u64 stack_trace_t[PERF_MAX_STACK_DEPTH];
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struct {
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__uint(type, BPF_MAP_TYPE_STACK_TRACE);
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__uint(max_entries, 16384);
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__type(key, __u32);
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__type(value, stack_trace_t);
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} stackmap SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, stack_trace_t);
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} stackdata_map SEC(".maps");
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long stackid_kernel = 1;
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long stackid_user = 1;
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long stack_kernel = 1;
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long stack_user = 1;
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SEC("perf_event")
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int oncpu(void *ctx)
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{
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stack_trace_t *trace;
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__u32 key = 0;
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long val;
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val = bpf_get_stackid(ctx, &stackmap, 0);
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if (val >= 0)
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stackid_kernel = 2;
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val = bpf_get_stackid(ctx, &stackmap, BPF_F_USER_STACK);
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if (val >= 0)
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stackid_user = 2;
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trace = bpf_map_lookup_elem(&stackdata_map, &key);
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if (!trace)
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return 0;
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val = bpf_get_stack(ctx, trace, sizeof(stack_trace_t), 0);
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if (val > 0)
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stack_kernel = 2;
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val = bpf_get_stack(ctx, trace, sizeof(stack_trace_t), BPF_F_USER_STACK);
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if (val > 0)
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stack_user = 2;
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return 0;
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}
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char LICENSE[] SEC("license") = "GPL";
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