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