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/*

* bitehist.c Block I/O size histogram.

* 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>

#include <linux/blkdev.h>

BPF_HISTOGRAM(dist);

int kprobe__blk_account_io_completion(struct pt_regs *ctx, struct request *req)

{

dist.increment(bpf_log2l(req->__data_len / 1024));

return 0;

}