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Name	Size	Permission	Date
CMakeLists.txt	276 B	-rw-r--r--	2023-12-08 15:36
biolatpcts.py	3.23 KB	-rwxr-xr-x	2023-12-08 15:36
biolatpcts_example.txt	650 B	-rw-r--r--	2023-12-08 15:36
bitehist.py	1.36 KB	-rwxr-xr-x	2023-12-08 15:36
bitehist_example.txt	1.18 KB	-rw-r--r--	2023-12-08 15:36
dddos.py	3.73 KB	-rwxr-xr-x	2023-12-08 15:36
dddos_example.txt	2.06 KB	-rw-r--r--	2023-12-08 15:36
disksnoop.py	1.9 KB	-rwxr-xr-x	2023-12-08 15:36
disksnoop_example.txt	1.55 KB	-rw-r--r--	2023-12-08 15:36
hello_fields.py	679 B	-rwxr-xr-x	2023-12-08 15:36
hello_perf_output.py	1.24 KB	-rwxr-xr-x	2023-12-08 15:36
hello_perf_output_using_ns.py	1.8 KB	-rwxr-xr-x	2023-12-08 15:36
kvm_hypercall.py	1.48 KB	-rwxr-xr-x	2023-12-08 15:36
kvm_hypercall.txt	1.74 KB	-rw-r--r--	2023-12-08 15:36
mallocstacks.py	1.9 KB	-rwxr-xr-x	2023-12-08 15:36
mysqld_query.py	1.66 KB	-rwxr-xr-x	2023-12-08 15:36
mysqld_query_example.txt	499 B	-rw-r--r--	2023-12-08 15:36
nflatency.py	6.07 KB	-rwxr-xr-x	2023-12-08 15:36
nodejs_http_server.py	1.34 KB	-rwxr-xr-x	2023-12-08 15:36
nodejs_http_server_example.txt	276 B	-rw-r--r--	2023-12-08 15:36
stack_buildid_example.py	3.03 KB	-rwxr-xr-x	2023-12-08 15:36
stacksnoop.py	3.18 KB	-rwxr-xr-x	2023-12-08 15:36
stacksnoop_example.txt	2.8 KB	-rw-r--r--	2023-12-08 15:36
strlen_count.py	1.3 KB	-rwxr-xr-x	2023-12-08 15:36
strlen_hist.py	1.81 KB	-rwxr-xr-x	2023-12-08 15:36
strlen_hist_ifunc.py	3.71 KB	-rwxr-xr-x	2023-12-08 15:36
strlen_snoop.py	1.35 KB	-rwxr-xr-x	2023-12-08 15:36
sync_timing.py	1.36 KB	-rwxr-xr-x	2023-12-08 15:36
task_switch.c	499 B	-rw-r--r--	2023-12-08 15:36
task_switch.py	486 B	-rwxr-xr-x	2023-12-08 15:36
tcpv4connect.py	2.36 KB	-rwxr-xr-x	2023-12-08 15:36
tcpv4connect_example.txt	1.04 KB	-rw-r--r--	2023-12-08 15:36
trace_fields.py	589 B	-rwxr-xr-x	2023-12-08 15:36
trace_perf_output.py	1.56 KB	-rwxr-xr-x	2023-12-08 15:36
undump.py	3.52 KB	-rwxr-xr-x	2023-12-08 15:36
undump_example.txt	886 B	-rw-r--r--	2023-12-08 15:36
urandomread-explicit.py	1.48 KB	-rwxr-xr-x	2023-12-08 15:36
urandomread.py	1.01 KB	-rwxr-xr-x	2023-12-08 15:36
urandomread_example.txt	675 B	-rw-r--r--	2023-12-08 15:36
vfsreadlat.c	896 B	-rw-r--r--	2023-12-08 15:36
vfsreadlat.py	1.3 KB	-rwxr-xr-x	2023-12-08 15:36
vfsreadlat_example.txt	3.53 KB	-rw-r--r--	2023-12-08 15:36

Rename

#!/usr/bin/python
# Copyright (c) PLUMgrid, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")

# This is an example of tracing an event and printing custom fields.
# run in project examples directory with:
# sudo ./trace_fields.py"

import atexit
from bcc import BPF
from bcc.utils import printb
import ctypes as ct

class Data(ct.Structure):
    _fields_ = [("ts", ct.c_ulonglong),
                ("magic", ct.c_ulonglong)]

counter = 0
def cb(cpu, data, size):
    assert size >= ct.sizeof(Data)
    event = ct.cast(data, ct.POINTER(Data)).contents
    print("[%0d] %f: %x" % (cpu, float(event.ts) / 1000000, event.magic))
    global counter
    counter += 1

prog = """
BPF_PERF_OUTPUT(events);
BPF_ARRAY(counters, u64, 10);
int do_sys_clone(void *ctx) {
  struct {
    u64 ts;
    u64 magic;
  } data = {bpf_ktime_get_ns(), 0x12345678};
  int rc;
  if ((rc = events.perf_submit(ctx, &data, sizeof(data))) < 0)
    bpf_trace_printk("perf_output failed: %d\\n", rc);
  int zero = 0;
  u64 *val = counters.lookup(&zero);
  if (val) lock_xadd(val, 1);
  return 0;
}
"""
b = BPF(text=prog)
event_name = b.get_syscall_fnname("clone")
b.attach_kprobe(event=event_name, fn_name="do_sys_clone")
b["events"].open_perf_buffer(cb)

@atexit.register
def print_counter():
    global counter
    global b
    print("counter = %d vs %d" % (counter, b["counters"][ct.c_int(0)].value))

printb(b"Tracing " + event_name + b", try `dd if=/dev/zero of=/dev/null`")
print("Tracing... Hit Ctrl-C to end.")
while 1:
    try:
        b.perf_buffer_poll()
    except KeyboardInterrupt:
        exit()