Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
61 lines
1.7 KiB
C
61 lines
1.7 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 "vmlinux.h"
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#include <linux/version.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.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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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.multi/spin_*lock*")PROG(spin_lock)
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SEC("kprobe.multi/*_spin_on_owner")PROG(spin_on_owner)
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SEC("kprobe.multi/_raw_spin_*lock*")PROG(raw_spin_lock)
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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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