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construct/include/ircd/fs/aio.h

84 lines
3.3 KiB
C++

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_FS_AIO_H
// Public and unconditional interface for AIO. This file is part of the
// standard include stack and available whether or not this platform is Linux
// with AIO, and whether or not it's enabled, etc. If it is not most of this
// stuff does nothing and will have null values.
/// Asynchronous filesystem Input/Output
///
namespace ircd::fs::aio
{
struct init;
struct stats;
struct system;
struct request;
extern const size_t MAX_EVENTS;
extern const size_t MAX_REQPRIO;
extern conf::item<bool> enable;
extern conf::item<size_t> max_events;
extern conf::item<size_t> max_submit;
extern conf::item<bool> submit_coalesce;
extern struct stats stats;
extern struct system *system;
bool for_each_completed(const std::function<bool (const request &)> &);
bool for_each_queued(const std::function<bool (const request &)> &);
size_t count_queued(const op &);
}
/// Statistics structure.
///
struct ircd::fs::aio::stats
{
uint64_t requests {0}; ///< count of requests created
uint64_t complete {0}; ///< count of requests completed
uint64_t submits {0}; ///< count of io_submit calls
uint64_t chases {0}; ///< count of chase calls
uint64_t handles {0}; ///< count of event_fd callbacks
uint64_t events {0}; ///< count of events from io_getevents
uint64_t cancel {0}; ///< count of requests canceled
uint64_t errors {0}; ///< count of response errcodes
uint64_t reads {0}; ///< count of read complete
uint64_t writes {0}; ///< count of write complete
uint64_t stalls {0}; ///< count of io_submit's blocking.
uint64_t bytes_requests {0}; ///< total bytes for requests created
uint64_t bytes_complete {0}; ///< total bytes for requests completed
uint64_t bytes_errors {0}; ///< total bytes for completed w/ errc
uint64_t bytes_cancel {0}; ///< total bytes for cancels
uint64_t bytes_read {0}; ///< total bytes for read completed
uint64_t bytes_write {0}; ///< total bytes for write completed
uint32_t cur_bytes_write {0}; ///< pending write bytes
uint16_t cur_reads {0}; ///< pending reads
uint16_t cur_writes {0}; ///< pending write
uint16_t cur_queued {0}; ///< nr of requests in userspace queue
uint16_t cur_submits {0}; ///< nr requests in flight with kernel
uint16_t max_requests {0}; ///< maximum observed pending requests
uint16_t max_reads {0}; ///< maximum observed pending reads
uint16_t max_writes {0}; ///< maximum observed pending write
uint16_t max_queued {0}; ///< maximum observed in queue.
uint16_t max_submits {0}; ///< maximum observed in flight.
};
struct ircd::fs::aio::init
{
init();
~init() noexcept;
};