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148 lines
3.9 KiB
148 lines
3.9 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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# 17-Feb-2016 Allan McAleavy updated for BPF_PERF_OUTPUT
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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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import ctypes as ct
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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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parser.add_argument("--ebpf", action="store_true",
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help=argparse.SUPPRESS)
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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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#include <linux/sched.h>
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struct data_t {
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u32 pid;
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u64 delta;
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char comm[TASK_COMM_LEN];
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char fname[DNAME_INLINE_LEN];
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};
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BPF_HASH(birth, struct dentry *);
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BPF_PERF_OUTPUT(events);
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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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struct data_t data = {};
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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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struct qstr d_name = dentry->d_name;
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if (d_name.len == 0)
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return 0;
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if (bpf_get_current_comm(&data.comm, sizeof(data.comm)) == 0) {
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data.pid = pid;
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data.delta = delta;
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bpf_probe_read(&data.fname, sizeof(data.fname), d_name.name);
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}
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events.perf_submit(ctx, &data, sizeof(data));
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return 0;
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}
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"""
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TASK_COMM_LEN = 16 # linux/sched.h
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DNAME_INLINE_LEN = 255 # linux/dcache.h
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class Data(ct.Structure):
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_fields_ = [
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("pid", ct.c_uint),
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("delta", ct.c_ulonglong),
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("comm", ct.c_char * TASK_COMM_LEN),
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("fname", ct.c_char * DNAME_INLINE_LEN)
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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 or args.ebpf:
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print(bpf_text)
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if args.ebpf:
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exit()
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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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# newer kernels (say, 4.8) may don't fire vfs_create, so record (or overwrite)
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# the timestamp in security_inode_create():
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b.attach_kprobe(event="security_inode_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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# process event
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def print_event(cpu, data, size):
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event = ct.cast(data, ct.POINTER(Data)).contents
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print("%-8s %-6d %-16s %-7.2f %s" % (strftime("%H:%M:%S"), event.pid,
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event.comm.decode('utf-8', 'replace'), float(event.delta) / 1000,
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event.fname.decode('utf-8', 'replace')))
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b["events"].open_perf_buffer(print_event)
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while 1:
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try:
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b.perf_buffer_poll()
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except KeyboardInterrupt:
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exit()
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