Some functions is recursive for the kprobe_multi and impact the benchmark
results. So just skip them.
Signed-off-by: Menglong Dong <dongml2@xxxxxxxxxxxxxxx>
---
v2:
- introduce trace_blacklist instead of copy-pasting strcmp
---
tools/testing/selftests/bpf/trace_helpers.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
index d24baf244d1f..9577979bd84d 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -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;
}
--
2.51.0
