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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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Demonstrations of vfsreadlat.py, the Linux eBPF/bcc version. This example traces the latency of vfs_read (time from call to return), printing it as a histogram distribution. By default, output is every five seconds: # ./vfsreadlat.py Tracing... Hit Ctrl-C to end. usecs : count distribution 0 -> 1 : 4457 |*************************************+| 2 -> 3 : 447 |*** | 4 -> 7 : 2059 |***************** | 8 -> 15 : 1179 |********** | 16 -> 31 : 63 | | 32 -> 63 : 0 | | 64 -> 127 : 2 | | 128 -> 255 : 0 | | 256 -> 511 : 3 | | 512 -> 1023 : 1 | | 1024 -> 2047 : 3 | | 2048 -> 4095 : 2 | | 4096 -> 8191 : 0 | | 8192 -> 16383 : 0 | | 16384 -> 32767 : 0 | | 32768 -> 65535 : 0 | | 65536 -> 131071 : 4 | | 131072 -> 262143 : 2 | | 262144 -> 524287 : 0 | | 524288 -> 1048575 : 4 | | ^C usecs : count distribution 0 -> 1 : 241 |*************************************+| 2 -> 3 : 17 |** | 4 -> 7 : 2 | | 8 -> 15 : 4 | | 16 -> 31 : 2 | | 32 -> 63 : 0 | | 64 -> 127 : 1 | | 128 -> 255 : 0 | | 256 -> 511 : 1 | | 512 -> 1023 : 1 | | 1024 -> 2047 : 0 | | 2048 -> 4095 : 1 | | 4096 -> 8191 : 0 | | 8192 -> 16383 : 0 | | 16384 -> 32767 : 0 | | 32768 -> 65535 : 0 | | 65536 -> 131071 : 0 | | 131072 -> 262143 : 0 | | 262144 -> 524287 : 0 | | 524288 -> 1048575 : 1 | | These examples show outliers in the 524 - 1048 milliseconds range. Since vfs_read() will catch many types of events, this could be anything including keystroke latency on ssh sessions. Further drilling with bcc will be necessary to identify more details. Full usage: # ./vfsreadlat.py -h USAGE: ./vfsreadlat.py [interval [count]]