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

Rtoax · anakryiko · commit d205d4af3a5e · 2024-08-27T16:17:44.000-07:00
commit 7bd230a ("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: torvalds@7bd230a Link: https://lore.kernel.org/bpf/tencent_34E5BCCAC5ABF3E81222AD81B1D05F16DE06@qq.com
diff --git a/samples/bpf/tracex4.bpf.c b/samples/bpf/tracex4.bpf.c
@@ -33,13 +33,13 @@ int bpf_prog1(struct pt_regs *ctx)
 	return 0;
 }
 
-SEC("kretprobe/kmem_cache_alloc_node")
+SEC("kretprobe/kmem_cache_alloc_node_noprof")
 int bpf_prog2(struct pt_regs *ctx)
 {
 	long ptr = PT_REGS_RC(ctx);
 	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);
 
 	struct pair v = {

Original file line number	Diff line number	Diff line change
`@@ -33,13 +33,13 @@ int bpf_prog1(struct pt_regs *ctx)`
`33`	`33`	`return 0;`
`34`	`34`	`}`
`35`	`35`
`36`		`-SEC("kretprobe/kmem_cache_alloc_node")`
	`36`	`+SEC("kretprobe/kmem_cache_alloc_node_noprof")`
`37`	`37`	`int bpf_prog2(struct pt_regs *ctx)`
`38`	`38`	`{`
`39`	`39`	`long ptr = PT_REGS_RC(ctx);`
`40`	`40`	`long ip = 0;`
`41`	`41`
`42`		`- /* get ip address of kmem_cache_alloc_node() caller */`
	`42`	`+ /* get ip address of kmem_cache_alloc_node_noprof() caller */`
`43`	`43`	`BPF_KRETPROBE_READ_RET_IP(ip, ctx);`
`44`	`44`
`45`	`45`	`struct pair v = {`