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CMakeLists.txt
276
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biolatpcts.py
3.23
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biolatpcts_example.txt
650
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bitehist.py
1.36
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bitehist_example.txt
1.18
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dddos.py
3.73
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dddos_example.txt
2.06
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disksnoop.py
1.9
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disksnoop_example.txt
1.55
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hello_fields.py
679
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hello_perf_output.py
1.24
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hello_perf_output_using_ns.py
1.8
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kvm_hypercall.py
1.48
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kvm_hypercall.txt
1.74
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mallocstacks.py
1.9
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mysqld_query.py
1.66
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mysqld_query_example.txt
499
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nflatency.py
6.07
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nodejs_http_server.py
1.34
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nodejs_http_server_example.txt
276
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stack_buildid_example.py
3.03
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stacksnoop.py
3.18
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stacksnoop_example.txt
2.8
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strlen_count.py
1.3
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strlen_hist.py
1.81
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strlen_hist_ifunc.py
3.71
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strlen_snoop.py
1.35
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sync_timing.py
1.36
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task_switch.c
499
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task_switch.py
486
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tcpv4connect.py
2.36
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tcpv4connect_example.txt
1.04
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trace_fields.py
589
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trace_perf_output.py
1.56
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undump.py
3.52
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undump_example.txt
886
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urandomread-explicit.py
1.48
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urandomread.py
1.01
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urandomread_example.txt
675
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vfsreadlat.c
896
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vfsreadlat.py
1.3
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vfsreadlat_example.txt
3.53
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#!/usr/bin/python # # sync_timing.py Trace time between syncs. # For Linux, uses BCC, eBPF. Embedded C. # # Written as a basic example of tracing time between events. # # Copyright 2016 Netflix, Inc. # Licensed under the Apache License, Version 2.0 (the "License") from __future__ import print_function from bcc import BPF from bcc.utils import printb # load BPF program b = BPF(text=""" #include <uapi/linux/ptrace.h> BPF_HASH(last); int do_trace(struct pt_regs *ctx) { u64 ts, *tsp, delta, key = 0; // attempt to read stored timestamp tsp = last.lookup(&key); if (tsp != NULL) { delta = bpf_ktime_get_ns() - *tsp; if (delta < 1000000000) { // output if time is less than 1 second bpf_trace_printk("%d\\n", delta / 1000000); } last.delete(&key); } // update stored timestamp ts = bpf_ktime_get_ns(); last.update(&key, &ts); return 0; } """) b.attach_kprobe(event=b.get_syscall_fnname("sync"), fn_name="do_trace") print("Tracing for quick sync's... Ctrl-C to end") # format output start = 0 while 1: try: (task, pid, cpu, flags, ts, ms) = b.trace_fields() if start == 0: start = ts ts = ts - start printb(b"At time %.2f s: multiple syncs detected, last %s ms ago" % (ts, ms)) except KeyboardInterrupt: exit()