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Date
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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 # # strlen_hist.py Histogram of system-wide strlen return values # # A basic example of using uprobes along with a histogram to show # distributions. # # Runs until ctrl-c is pressed. # # Copyright (c) PLUMgrid, Inc. # Licensed under the Apache License, Version 2.0 (the "License") # # Example output: # $ sudo ./strlen_hist.py # 22:12:52 # strlen return: : count distribution # 0 -> 1 : 2106 |**************** | # 2 -> 3 : 1172 |********* | # 4 -> 7 : 3892 |****************************** | # 8 -> 15 : 5096 |****************************************| # 16 -> 31 : 2201 |***************** | # 32 -> 63 : 547 |**** | # 64 -> 127 : 106 | | # 128 -> 255 : 13 | | # 256 -> 511 : 27 | | # 512 -> 1023 : 6 | | # 1024 -> 2047 : 10 | | # ^C$ # from __future__ import print_function import bcc import time text = """ #include <uapi/linux/ptrace.h> BPF_HISTOGRAM(dist); int count(struct pt_regs *ctx) { dist.increment(bpf_log2l(PT_REGS_RC(ctx))); return 0; } """ b = bcc.BPF(text=text) sym="strlen" b.attach_uretprobe(name="c", sym=sym, fn_name="count") dist = b["dist"] try: while True: time.sleep(1) print("%-8s\n" % time.strftime("%H:%M:%S"), end="") dist.print_log2_hist(sym + " return:") dist.clear() except KeyboardInterrupt: pass