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50 lines
1.1 KiB
50 lines
1.1 KiB
#!/usr/bin/env python
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# @lint-avoid-python-3-compatibility-imports
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#
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# vfscount Count VFS calls ("vfs_*").
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# For Linux, uses BCC, eBPF. See .c file.
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#
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# Written as a basic example of counting functions.
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#
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# Copyright (c) 2015 Brendan Gregg.
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# Licensed under the Apache License, Version 2.0 (the "License")
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#
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# 14-Aug-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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from time import sleep
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# load BPF program
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b = BPF(text="""
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#include <uapi/linux/ptrace.h>
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struct key_t {
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u64 ip;
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};
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BPF_HASH(counts, struct key_t, u64, 256);
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int do_count(struct pt_regs *ctx) {
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struct key_t key = {};
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key.ip = PT_REGS_IP(ctx);
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counts.increment(key);
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return 0;
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}
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""")
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b.attach_kprobe(event_re="^vfs_.*", fn_name="do_count")
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# header
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print("Tracing... Ctrl-C to end.")
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# output
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try:
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sleep(99999999)
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except KeyboardInterrupt:
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pass
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print("\n%-16s %-26s %8s" % ("ADDR", "FUNC", "COUNT"))
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counts = b.get_table("counts")
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for k, v in sorted(counts.items(), key=lambda counts: counts[1].value):
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print("%-16x %-26s %8d" % (k.ip, b.ksym(k.ip), v.value))
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