mirror of
https://github.com/varun-r-mallya/Python-BPF.git
synced 2025-12-31 21:06:25 +00:00
59 lines
1.3 KiB
Python
59 lines
1.3 KiB
Python
from pythonbpf import bpf, map, section, bpfglobal, BPF, trace_fields
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from pythonbpf.helper import ktime
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from pythonbpf.maps import HashMap
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from ctypes import c_void_p, c_int64
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@bpf
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@map
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def last() -> HashMap:
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return HashMap(key=c_int64, value=c_int64, max_entries=2)
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@bpf
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@section("tracepoint/syscalls/sys_enter_sync")
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def do_trace(ctx: c_void_p) -> c_int64:
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ts_key, cnt_key = 0, 1
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tsp, cntp = last.lookup(ts_key), last.lookup(cnt_key)
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if not cntp:
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last.update(cnt_key, 0)
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cntp = last.lookup(cnt_key)
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if tsp:
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delta = ktime() - tsp
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if delta < 1000000000:
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time_ms = delta // 1000000
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print(f"{time_ms} {cntp}")
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last.delete(ts_key)
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else:
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last.update(ts_key, ktime())
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last.update(cnt_key, cntp + 1)
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return 0 # type: ignore [return-value]
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@bpf
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@bpfglobal
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def LICENSE() -> str:
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return "GPL"
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# Compile and load
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b = BPF()
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b.load()
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b.attach_all()
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print("Tracing for quick sync's... Ctrl-C to end")
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# format output
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start = 0
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while True:
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try:
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task, pid, cpu, flags, ts, msg = trace_fields()
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if start == 0:
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start = ts
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ts -= start
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ms, cnt = msg.split()
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print(f"At time {ts} s: Multiple syncs detected, last {ms} ms ago. Count {cnt}")
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except KeyboardInterrupt:
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exit()
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