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#!/usr/bin/python
# @lint-avoid-python-3-compatibility-imports
#
# filetop file reads and writes by process.
# For Linux, uses BCC, eBPF.
#
# USAGE: filetop.py [-h] [-C] [-r MAXROWS] [interval] [count]
#
# This uses in-kernel eBPF maps to store per process summaries for efficiency.
#
# Copyright 2016 Netflix, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 06-Feb-2016 Brendan Gregg Created this.
from __future__ import print_function
from bcc import BPF
from time import sleep, strftime
import argparse
from subprocess import call
# arguments
examples = """examples:
./filetop # file I/O top, 1 second refresh
./filetop -C # don't clear the screen
./filetop -p 181 # PID 181 only
./filetop 5 # 5 second summaries
./filetop 5 10 # 5 second summaries, 10 times only
"""
parser = argparse.ArgumentParser(
description="File reads and writes by process",
formatter_class=argparse.RawDescriptionHelpFormatter,
epilog=examples)
parser.add_argument("-a", "--all-files", action="store_true",
help="include non-regular file types (sockets, FIFOs, etc)")
parser.add_argument("-C", "--noclear", action="store_true",
help="don't clear the screen")
parser.add_argument("-r", "--maxrows", default=20,
help="maximum rows to print, default 20")
parser.add_argument("-s", "--sort", default="all",
choices=["all", "reads", "writes", "rbytes", "wbytes"],
help="sort column, default all")
parser.add_argument("-p", "--pid", type=int, metavar="PID", dest="tgid",
help="trace this PID only")
parser.add_argument("interval", nargs="?", default=1,
help="output interval, in seconds")
parser.add_argument("count", nargs="?", default=99999999,
help="number of outputs")
parser.add_argument("--ebpf", action="store_true",
help=argparse.SUPPRESS)
args = parser.parse_args()
interval = int(args.interval)
countdown = int(args.count)
maxrows = int(args.maxrows)
clear = not int(args.noclear)
debug = 0
# linux stats
loadavg = "/proc/loadavg"
# define BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
#include <linux/blkdev.h>
// the key for the output summary
struct info_t {
unsigned long inode;
dev_t dev;
dev_t rdev;
u32 pid;
u32 name_len;
char comm[TASK_COMM_LEN];
// de->d_name.name may point to de->d_iname so limit len accordingly
char name[DNAME_INLINE_LEN];
char type;
};
// the value of the output summary
struct val_t {
u64 reads;
u64 writes;
u64 rbytes;
u64 wbytes;
};
BPF_HASH(counts, struct info_t, struct val_t);
static int do_entry(struct pt_regs *ctx, struct file *file,
char __user *buf, size_t count, int is_read)
{
u32 tgid = bpf_get_current_pid_tgid() >> 32;
if (TGID_FILTER)
return 0;
u32 pid = bpf_get_current_pid_tgid();
// skip I/O lacking a filename
struct dentry *de = file->f_path.dentry;
int mode = file->f_inode->i_mode;
struct qstr d_name = de->d_name;
if (d_name.len == 0 || TYPE_FILTER)
return 0;
// store counts and sizes by pid & file
struct info_t info = {
.pid = pid,
.inode = file->f_inode->i_ino,
.dev = file->f_inode->i_sb->s_dev,
.rdev = file->f_inode->i_rdev,
};
bpf_get_current_comm(&info.comm, sizeof(info.comm));
info.name_len = d_name.len;
bpf_probe_read_kernel(&info.name, sizeof(info.name), d_name.name);
if (S_ISREG(mode)) {
info.type = 'R';
} else if (S_ISSOCK(mode)) {
info.type = 'S';
} else {
info.type = 'O';
}
struct val_t *valp, zero = {};
valp = counts.lookup_or_try_init(&info, &zero);
if (valp) {
if (is_read) {
valp->reads++;
valp->rbytes += count;
} else {
valp->writes++;
valp->wbytes += count;
}
}
return 0;
}
int trace_read_entry(struct pt_regs *ctx, struct file *file,
char __user *buf, size_t count)
{
return do_entry(ctx, file, buf, count, 1);
}
int trace_write_entry(struct pt_regs *ctx, struct file *file,
char __user *buf, size_t count)
{
return do_entry(ctx, file, buf, count, 0);
}
"""
if args.tgid:
bpf_text = bpf_text.replace('TGID_FILTER', 'tgid != %d' % args.tgid)
else:
bpf_text = bpf_text.replace('TGID_FILTER', '0')
if args.all_files:
bpf_text = bpf_text.replace('TYPE_FILTER', '0')
else:
bpf_text = bpf_text.replace('TYPE_FILTER', '!S_ISREG(mode)')
if debug or args.ebpf:
print(bpf_text)
if args.ebpf:
exit()
# initialize BPF
b = BPF(text=bpf_text)
b.attach_kprobe(event="vfs_read", fn_name="trace_read_entry")
b.attach_kprobe(event="vfs_write", fn_name="trace_write_entry")
DNAME_INLINE_LEN = 32 # linux/dcache.h
print('Tracing... Output every %d secs. Hit Ctrl-C to end' % interval)
def sort_fn(counts):
if args.sort == "all":
return (counts[1].rbytes + counts[1].wbytes + counts[1].reads + counts[1].writes)
else:
return getattr(counts[1], args.sort)
# output
exiting = 0
while 1:
try:
sleep(interval)
except KeyboardInterrupt:
exiting = 1
# header
if clear:
call("clear")
else:
print()
with open(loadavg) as stats:
print("%-8s loadavg: %s" % (strftime("%H:%M:%S"), stats.read()))
print("%-7s %-16s %-6s %-6s %-7s %-7s %1s %s" % ("TID", "COMM",
"READS", "WRITES", "R_Kb", "W_Kb", "T", "FILE"))
# by-TID output
counts = b.get_table("counts")
line = 0
for k, v in reversed(sorted(counts.items(),
key=sort_fn)):
name = k.name.decode('utf-8', 'replace')
if k.name_len > DNAME_INLINE_LEN:
name = name[:-3] + "..."
# print line
print("%-7d %-16s %-6d %-6d %-7d %-7d %1s %s" % (k.pid,
k.comm.decode('utf-8', 'replace'), v.reads, v.writes,
v.rbytes / 1024, v.wbytes / 1024,
k.type.decode('utf-8', 'replace'), name))
line += 1
if line >= maxrows:
break
counts.clear()
countdown -= 1
if exiting or countdown == 0:
print("Detaching...")
exit()
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