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/*
* vfsreadlat.c VFS read latency distribution.
* For Linux, uses BCC, eBPF. See .py file.
*
* Copyright (c) 2013-2015 PLUMgrid, http://plumgrid.com
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* 15-Aug-2015 Brendan Gregg Created this.
*/
#include <uapi/linux/ptrace.h>
BPF_HASH(start, u32);
BPF_HISTOGRAM(dist);
int do_entry(struct pt_regs *ctx)
{
u32 pid;
u64 ts;
pid = bpf_get_current_pid_tgid();
ts = bpf_ktime_get_ns();
start.update(&pid, &ts);
return 0;
}
int do_return(struct pt_regs *ctx)
{
u32 pid;
u64 *tsp, delta;
pid = bpf_get_current_pid_tgid();
tsp = start.lookup(&pid);
if (tsp != 0) {
delta = bpf_ktime_get_ns() - *tsp;
dist.increment(bpf_log2l(delta / 1000));
start.delete(&pid);
}
return 0;
}