tools: replace add with xadd (#3518)

resolve #3481
replace add with xadd for more tools.
diff --git a/tools/bitesize.py b/tools/bitesize.py
index 6ae71dc..69e3633 100755
--- a/tools/bitesize.py
+++ b/tools/bitesize.py
@@ -31,7 +31,7 @@
 {
     struct proc_key_t key = {.slot = bpf_log2l(args->bytes / 1024)};
     bpf_probe_read_kernel(&key.name, sizeof(key.name), args->comm);
-    dist.increment(key);
+    dist.atomic_increment(key);
     return 0;
 }
 """