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commit7bd230a266("mm/slab: enable slab allocation tagging for kmalloc and friends") [1] swap kmem_cache_alloc_node() to kmem_cache_alloc_node_noprof(). linux/samples/bpf$ sudo ./tracex4 libbpf: prog 'bpf_prog2': failed to create kretprobe 'kmem_cache_alloc_node+0x0' perf event: No such file or directory ERROR: bpf_program__attach failed Signed-off-by: Rong Tao <rongtao@cestc.cn> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link:7bd230a266Link: https://lore.kernel.org/bpf/tencent_34E5BCCAC5ABF3E81222AD81B1D05F16DE06@qq.com
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/* 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 "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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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_noprof")
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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_noprof() 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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