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#!/usr/bin/python | ||
# @lint-avoid-python-3-compatibility-imports | ||
# | ||
# filelife Trace the lifespan of short-lived files. | ||
# For Linux, uses BCC, eBPF. Embedded C. | ||
# | ||
# This traces the creation and deletion of files, providing information | ||
# on who deleted the file, the file age, and the file name. The intent is to | ||
# provide information on short-lived files, for debugging or performance | ||
# analysis. | ||
# | ||
# USAGE: filelife [-h] [-p PID] | ||
# | ||
# Copyright 2016 Netflix, Inc. | ||
# Licensed under the Apache License, Version 2.0 (the "License") | ||
# | ||
# 08-Feb-2015 Brendan Gregg Created this. | ||
|
||
from __future__ import print_function | ||
from bcc import BPF | ||
import argparse | ||
from time import strftime | ||
|
||
# arguments | ||
examples = """examples: | ||
./filelife # trace all stat() syscalls | ||
./filelife -p 181 # only trace PID 181 | ||
""" | ||
parser = argparse.ArgumentParser( | ||
description="Trace stat() syscalls", | ||
formatter_class=argparse.RawDescriptionHelpFormatter, | ||
epilog=examples) | ||
parser.add_argument("-p", "--pid", | ||
help="trace this PID only") | ||
args = parser.parse_args() | ||
debug = 0 | ||
|
||
# define BPF program | ||
bpf_text = """ | ||
#include <uapi/linux/ptrace.h> | ||
#include <linux/fs.h> | ||
BPF_HASH(birth, struct dentry *); | ||
// trace file creation time | ||
int trace_create(struct pt_regs *ctx, struct inode *dir, struct dentry *dentry) | ||
{ | ||
u32 pid = bpf_get_current_pid_tgid(); | ||
FILTER | ||
u64 ts = bpf_ktime_get_ns(); | ||
birth.update(&dentry, &ts); | ||
return 0; | ||
}; | ||
// trace file deletion and output details | ||
int trace_unlink(struct pt_regs *ctx, struct inode *dir, struct dentry *dentry) | ||
{ | ||
u32 pid = bpf_get_current_pid_tgid(); | ||
FILTER | ||
u64 *tsp, delta; | ||
tsp = birth.lookup(&dentry); | ||
if (tsp == 0) { | ||
return 0; // missed create | ||
} | ||
delta = (bpf_ktime_get_ns() - *tsp) / 1000000; | ||
birth.delete(&dentry); | ||
if (dentry->d_iname[0] == 0) | ||
return 0; | ||
bpf_trace_printk("%d %s\\n", delta, dentry->d_iname); | ||
return 0; | ||
} | ||
""" | ||
if args.pid: | ||
bpf_text = bpf_text.replace('FILTER', | ||
'if (pid != %s) { return 0; }' % args.pid) | ||
else: | ||
bpf_text = bpf_text.replace('FILTER', '') | ||
if debug: | ||
print(bpf_text) | ||
|
||
# initialize BPF | ||
b = BPF(text=bpf_text) | ||
b.attach_kprobe(event="vfs_create", fn_name="trace_create") | ||
b.attach_kprobe(event="vfs_unlink", fn_name="trace_unlink") | ||
|
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# header | ||
print("%-8s %-6s %-16s %-7s %s" % ("TIME", "PID", "COMM", "AGE(s)", "FILE")) | ||
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start_ts = 0 | ||
|
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# format output | ||
while 1: | ||
(task, pid, cpu, flags, ts, msg) = b.trace_fields() | ||
(delta, filename) = msg.split(" ", 1) | ||
|
||
# print columns | ||
print("%-8s %-6d %-16s %-7.2f %s" % (strftime("%H:%M:%S"), pid, task, | ||
float(delta) / 1000, filename)) |