37 lines
664 B
Plaintext
Executable File
37 lines
664 B
Plaintext
Executable File
#!/usr/bin/env bpftrace
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/*
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* biolatency.bt Block I/O latency as a histogram.
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* For Linux, uses bpftrace, eBPF.
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*
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* This is a bpftrace version of the bcc tool of the same name.
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*
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* Copyright 2018 Netflix, Inc.
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* Licensed under the Apache License, Version 2.0 (the "License")
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*
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* 13-Sep-2018 Brendan Gregg Created this.
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*/
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BEGIN
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{
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printf("Tracing block device I/O... Hit Ctrl-C to end.\n");
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}
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kprobe:blk_account_io_start,
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kprobe:__blk_account_io_start
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{
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@start[arg0] = nsecs;
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}
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kprobe:blk_account_io_done,
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kprobe:__blk_account_io_done
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/@start[arg0]/
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{
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@usecs = hist((nsecs - @start[arg0]) / 1000);
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delete(@start[arg0]);
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}
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END
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{
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clear(@start);
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}
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