mirror of
https://github.com/varun-r-mallya/Python-BPF.git
synced 2025-12-31 21:06:25 +00:00
76 lines
1.5 KiB
Python
76 lines
1.5 KiB
Python
from pythonbpf import bpf, map, struct, section, bpfglobal, BPF
|
|
from pythonbpf.helper import ktime
|
|
from pythonbpf.maps import HashMap, PerfEventArray
|
|
from ctypes import c_void_p, c_int64
|
|
|
|
|
|
@bpf
|
|
@struct
|
|
class data_t:
|
|
ts: c_int64
|
|
ms: c_int64
|
|
|
|
|
|
@bpf
|
|
@map
|
|
def events() -> PerfEventArray:
|
|
return PerfEventArray(key_size=c_int64, value_size=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:
|
|
dat, dat.ts, key = data_t(), ktime(), 0
|
|
tsp = last.lookup(key)
|
|
if tsp:
|
|
delta = ktime() - tsp
|
|
if delta < 1000000000:
|
|
dat.ms = delta // 1000000
|
|
events.output(dat)
|
|
last.delete(key)
|
|
else:
|
|
last.update(key, ktime())
|
|
return 0 # type: ignore [return-value]
|
|
|
|
|
|
@bpf
|
|
@bpfglobal
|
|
def LICENSE() -> str:
|
|
return "GPL"
|
|
|
|
|
|
# Compile and load
|
|
b = BPF()
|
|
b.load()
|
|
b.attach_all()
|
|
|
|
print("Tracing for quick sync's... Ctrl-C to end")
|
|
|
|
# format output
|
|
start = 0
|
|
|
|
|
|
def callback(cpu, event):
|
|
global start
|
|
if start == 0:
|
|
start = event.ts
|
|
event.ts -= start
|
|
print(
|
|
f"At time {event.ts / 1e9} s: Multiple sync detected, Last sync: {event.ms} ms ago"
|
|
)
|
|
|
|
|
|
perf = b["events"].open_perf_buffer(callback, struct_name="data_t")
|
|
print("Starting to poll... (Ctrl+C to stop)")
|
|
try:
|
|
while True:
|
|
b["events"].poll(1000)
|
|
except KeyboardInterrupt:
|
|
print("Stopping...")
|