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45 lines
959 B
45 lines
959 B
7 months ago
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#!/usr/bin/env python
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#
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# bitehist.py Block I/O size histogram.
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# For Linux, uses BCC, eBPF. Embedded C.
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#
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# Written as a basic example of using a histogram to show a distribution.
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#
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# The default interval is 5 seconds. A Ctrl-C will print the partially
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# gathered histogram then exit.
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#
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# Copyright (c) 2015 Brendan Gregg.
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# Licensed under the Apache License, Version 2.0 (the "License")
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#
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# 15-Aug-2015 Brendan Gregg Created this.
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from __future__ import print_function
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from bcc import BPF
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from time import sleep
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# load BPF program
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b = BPF(text="""
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#include <uapi/linux/ptrace.h>
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#include <linux/blkdev.h>
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BPF_HISTOGRAM(dist);
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int kprobe__blk_account_io_completion(struct pt_regs *ctx, struct request *req)
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{
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dist.increment(bpf_log2l(req->__data_len / 1024));
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return 0;
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}
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""")
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# header
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print("Tracing... Hit Ctrl-C to end.")
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# trace until Ctrl-C
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try:
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sleep(99999999)
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except KeyboardInterrupt:
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print()
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# output
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b["dist"].print_log2_hist("kbytes")
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