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// Copyright (c) 2015 Brendan Gregg.
// Licensed under the Apache License, Version 2.0 (the "License")
#include <uapi/linux/ptrace.h>
#include <linux/blkdev.h>
BPF_HASH(start, struct request *);
BPF_HISTOGRAM(dist);
// time block I/O
int trace_req_start(struct pt_regs *ctx, struct request *req)
{
u64 ts = bpf_ktime_get_ns();
start.update(&req, &ts);
return 0;
}
// output
int trace_req_done(struct pt_regs *ctx, struct request *req)
{
u64 *tsp, delta;
// fetch timestamp and calculate delta
tsp = start.lookup(&req);
if (tsp == 0) {
return 0; // missed issue
}
delta = bpf_ktime_get_ns() - *tsp;
delta /= 1000; // usec
// store as histogram
dist.increment(bpf_log2l(delta));
start.delete(&req);
return 0;
}