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#! /usr/bin/python3
#
# bitehist.py Block I/O size histogram.
# For Linux, uses BCC, eBPF. See .c file.
#
# USAGE: bitesize
#
# Ctrl-C will print the partially gathered histogram then exit.
#
# Copyright (c) 2016 Allan McAleavy
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 05-Feb-2016 Allan McAleavy ran pep8 against file
# 19-Mar-2019 Brendan Gregg Switched to use tracepoints.
from bcc import BPF
from time import sleep
bpf_text = """
#include <uapi/linux/ptrace.h>
#include <linux/blkdev.h>
struct proc_key_t {
char name[TASK_COMM_LEN];
u64 slot;
};
BPF_HISTOGRAM(dist, struct proc_key_t);
TRACEPOINT_PROBE(block, block_rq_issue)
{
struct proc_key_t key = {.slot = bpf_log2l(args->bytes / 1024)};
bpf_probe_read_kernel(&key.name, sizeof(key.name), args->comm);
dist.atomic_increment(key);
return 0;
}
"""
# load BPF program
b = BPF(text=bpf_text)
print("Tracing block I/O... Hit Ctrl-C to end.")
# trace until Ctrl-C
dist = b.get_table("dist")
try:
sleep(99999999)
except KeyboardInterrupt:
dist.print_log2_hist("Kbytes", "Process Name",
section_print_fn=bytes.decode)