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3677d0a131
For the problem of increasing fragmentation of the bpf loader programs,
instead of using bpf_loader.o, which is used in samples/bpf, this
commit refactors the existing kprobe tracing programs with libbbpf
bpf loader.
- For kprobe events pointing to system calls, the SYSCALL() macro in
trace_common.h was used.
- Adding a kprobe event and attaching a bpf program to it was done
through bpf_program_attach().
- Instead of using the existing BPF MAP definition, MAP definition
has been refactored with the new BTF-defined MAP format.
Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200823085334.9413-3-danieltimlee@gmail.com
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* 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/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/version.h>
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#include <uapi/linux/bpf.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 {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, long);
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__type(value, long);
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__uint(max_entries, 1024);
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} my_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_HASH);
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__uint(key_size, sizeof(long));
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__uint(value_size, sizeof(long));
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__uint(max_entries, 1024);
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} my_map2 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 PROG(foo) \
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int foo(struct pt_regs *ctx) \
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{ \
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long v = PT_REGS_IP(ctx), *val; \
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\
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val = bpf_map_lookup_elem(&my_map, &v); \
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bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
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bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
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bpf_map_delete_elem(&my_map2, &v); \
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bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
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return 0; \
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}
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/* add kprobes to all possible *spin* functions */
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SEC("kprobe/spin_unlock")PROG(p1)
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SEC("kprobe/spin_lock")PROG(p2)
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SEC("kprobe/mutex_spin_on_owner")PROG(p3)
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SEC("kprobe/rwsem_spin_on_owner")PROG(p4)
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SEC("kprobe/spin_unlock_irqrestore")PROG(p5)
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SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6)
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SEC("kprobe/_raw_spin_unlock_bh")PROG(p7)
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SEC("kprobe/_raw_spin_unlock")PROG(p8)
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SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9)
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SEC("kprobe/_raw_spin_trylock_bh")PROG(p10)
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SEC("kprobe/_raw_spin_lock_irq")PROG(p11)
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SEC("kprobe/_raw_spin_trylock")PROG(p12)
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SEC("kprobe/_raw_spin_lock")PROG(p13)
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SEC("kprobe/_raw_spin_lock_bh")PROG(p14)
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/* and to inner bpf helpers */
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SEC("kprobe/htab_map_update_elem")PROG(p15)
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SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
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SEC("kprobe/htab_map_alloc")PROG(p17)
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char _license[] SEC("license") = "GPL";
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u32 _version SEC("version") = LINUX_VERSION_CODE;
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