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selftests/bpf: skip recursive functions for kprobe_multi

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

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20250904021011.14069-3-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Menglong Dong 2025-09-04 10:10:10 +08:00 committed by Alexei Starovoitov
parent 8bad31edf5
commit adf6b57ce4
1 changed files with 19 additions and 0 deletions
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19
tools/testing/selftests/bpf/trace_helpers.c
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@ -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;
}