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samples/bpf: tracex4: Fix failed to create kretprobe 'kmem_cache_alloc_node+0x0'

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commit 7bd230a266 ("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: 7bd230a266
Link: https://lore.kernel.org/bpf/tencent_34E5BCCAC5ABF3E81222AD81B1D05F16DE06@qq.com
This commit is contained in:
Rong Tao 2024-08-27 12:30:30 +08:00 committed by Andrii Nakryiko
parent ddc3d98807
commit d205d4af3a
1 changed files with 2 additions and 2 deletions
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4
samples/bpf/tracex4.bpf.c
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@ -33,13 +33,13 @@ int bpf_prog1(struct pt_regs *ctx)
return 0; return 0;
} }
SEC("kretprobe/kmem_cache_alloc_node") SEC("kretprobe/kmem_cache_alloc_node_noprof")
int bpf_prog2(struct pt_regs *ctx) int bpf_prog2(struct pt_regs *ctx)
{ {
long ptr = PT_REGS_RC(ctx); long ptr = PT_REGS_RC(ctx);
long ip = 0; long ip = 0;
/* get ip address of kmem_cache_alloc_node() caller */ /* get ip address of kmem_cache_alloc_node_noprof() caller */
BPF_KRETPROBE_READ_RET_IP(ip, ctx); BPF_KRETPROBE_READ_RET_IP(ip, ctx);
struct pair v = { struct pair v = {