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bitehist.py
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bitehist.py
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#!/usr/bin/python
#
# bitehist.py Block I/O size histogram.
# For Linux, uses BCC, eBPF. Embedded C.
#
# Written as a basic example of using histograms to show a distribution.
#
# A Ctrl-C will print the gathered histogram then exit.
#
# Copyright (c) 2015 Brendan Gregg.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 15-Aug-2015 Brendan Gregg Created this.
# 03-Feb-2019 Xiaozhou Liu added linear histogram.
from __future__ import print_function
from bcc import BPF
from time import sleep
# load BPF program
b = BPF(text="""
#include <uapi/linux/ptrace.h>
#include <linux/blkdev.h>
BPF_HISTOGRAM(dist);
BPF_HISTOGRAM(dist_linear);
int kprobe__blk_account_io_completion(struct pt_regs *ctx, struct request *req)
{
dist.increment(bpf_log2l(req->__data_len / 1024));
dist_linear.increment(req->__data_len / 1024);
return 0;
}
""")
# header
print("Tracing... Hit Ctrl-C to end.")
# trace until Ctrl-C
try:
sleep(99999999)
except KeyboardInterrupt:
print()
# output
print("log2 histogram")
print("~~~~~~~~~~~~~~")
b["dist"].print_log2_hist("kbytes")
print("\nlinear histogram")
print("~~~~~~~~~~~~~~~~")
b["dist_linear"].print_linear_hist("kbytes")