Add BCC sync_timing example

BCC-Examples/sync_timing.py

@@ -0,0 +1,52 @@
+from pythonbpf import bpf, map, section, bpfglobal, BPF, trace_fields
+from pythonbpf.helper import ktime
+from pythonbpf.maps import HashMap
+
+from ctypes import c_void_p, c_int64
+
+
+@bpf
+@map
+def last() -> HashMap:
+    return HashMap(key=c_int64, value=c_int64, max_entries=1)
+
+
+@bpf
+@section("tracepoint/syscalls/sys_enter_sync")
+def do_trace(ctx: c_void_p) -> c_int64:
+    key = 0
+    tsp = last.lookup(key)
+    if tsp:
+        delta = ktime() - tsp
+        if delta < 1000000000:
+            time_ms = delta // 1000000
+            print(f"{time_ms}")
+        last.delete(key)
+    else:
+        last.update(key, ktime())
+    return c_int64(0)
+
+
+@bpf
+@bpfglobal
+def LICENSE() -> str:
+    return "GPL"
+
+
+# compile
+b = BPF()
+b.load_and_attach()
+
+print("Tracing for quick sync's... Ctrl-C to end")
+
+# format output
+start = 0
+while True:
+    try:
+        task, pid, cpu, flags, ts, ms = trace_fields()
+        if start == 0:
+            start = ts
+        ts -= start
+        print(f"At time {ts} s: Multiple syncs detected, last {ms} ms ago")
+    except KeyboardInterrupt:
+        exit()