Commit adf6b57c authored by Menglong Dong's avatar Menglong Dong Committed by Alexei Starovoitov
Browse files

selftests/bpf: skip recursive functions for kprobe_multi 



Some functions is recursive for the kprobe_multi and impact the benchmark
results. So just skip them.

Signed-off-by: default avatarMenglong Dong <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20250904021011.14069-3-dongml2@chinatelecom.cn


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 8bad31ed

tools/testing/selftests/bpf/trace_helpers.c

+19 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <gelf.h>

#include "bpf/hashmap.h"

#include "bpf/libbpf_internal.h"

#include "bpf_util.h"



#define TRACEFS_PIPE	"/sys/kernel/tracing/trace_pipe"

#define DEBUGFS_PIPE	"/sys/kernel/debug/tracing/trace_pipe"
@@ -540,8 +541,20 @@ static bool is_invalid_entry(char *buf, bool kernel) 
	return false;

}



static const char * const trace_blacklist[] = {

	"migrate_disable",

	"migrate_enable",

	"rcu_read_unlock_strict",

	"preempt_count_add",

	"preempt_count_sub",

	"__rcu_read_lock",

	"__rcu_read_unlock",

};



static bool skip_entry(char *name)

{

	int i;



	/*

	 * We attach to almost all kernel functions and some of them

	 * will cause 'suspicious RCU usage' when fprobe is attached
@@ -559,6 +572,12 @@ static bool skip_entry(char *name) 
	if (!strncmp(name, "__ftrace_invalid_address__",

		     sizeof("__ftrace_invalid_address__") - 1))

		return true;



	for (i = 0; i < ARRAY_SIZE(trace_blacklist); i++) {

		if (!strcmp(name, trace_blacklist[i]))

			return true;

	}



	return false;

}