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55 lines
1.2 KiB
55 lines
1.2 KiB
/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com |
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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 <linux/version.h> |
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#include <uapi/linux/bpf.h> |
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#include <bpf/bpf_helpers.h> |
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#include <bpf/bpf_tracing.h> |
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struct pair { |
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u64 val; |
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u64 ip; |
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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, long); |
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__type(value, struct pair); |
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__uint(max_entries, 1000000); |
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} my_map SEC(".maps"); |
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/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe |
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* example will no longer be meaningful |
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*/ |
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SEC("kprobe/kmem_cache_free") |
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int bpf_prog1(struct pt_regs *ctx) |
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{ |
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long ptr = PT_REGS_PARM2(ctx); |
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bpf_map_delete_elem(&my_map, &ptr); |
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return 0; |
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} |
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SEC("kretprobe/kmem_cache_alloc_node") |
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int bpf_prog2(struct pt_regs *ctx) |
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{ |
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long ptr = PT_REGS_RC(ctx); |
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long ip = 0; |
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/* get ip address of kmem_cache_alloc_node() caller */ |
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BPF_KRETPROBE_READ_RET_IP(ip, ctx); |
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struct pair v = { |
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.val = bpf_ktime_get_ns(), |
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.ip = ip, |
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}; |
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bpf_map_update_elem(&my_map, &ptr, &v, BPF_ANY); |
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return 0; |
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} |
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char _license[] SEC("license") = "GPL"; |
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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