mirror of
https://github.com/matrix-construct/construct
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94 lines
3.2 KiB
C++
94 lines
3.2 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_FS_AIO_H
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// Public and unconditional interface for AIO. This file is part of the
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// standard include stack and available whether or not this platform is Linux
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// with AIO, and whether or not it's enabled, etc. If it is not most of this
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// stuff does nothing and will have null values.
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/// Asynchronous filesystem Input/Output
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///
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namespace ircd::fs::aio
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{
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struct init;
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struct stats;
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struct system;
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struct request;
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extern const size_t MAX_EVENTS;
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extern const size_t MAX_REQPRIO;
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extern conf::item<bool> enable;
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extern conf::item<size_t> max_events;
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extern conf::item<size_t> max_submit;
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extern conf::item<bool> submit_coalesce;
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extern struct stats stats;
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extern struct system *system;
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bool for_each_completed(const std::function<bool (const request &)> &);
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bool for_each_queued(const std::function<bool (const request &)> &);
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size_t count_queued(const op &);
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}
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/// Statistics structure.
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///
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struct ircd::fs::aio::stats
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{
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using item = ircd::stats::item<uint64_t *>;
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uint64_t value[32];
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size_t items;
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item requests; ///< count of requests created
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item complete; ///< count of requests completed
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item submits; ///< count of io_submit calls
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item chases; ///< count of chase calls
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item handles; ///< count of event_fd callbacks
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item events; ///< count of events from io_getevents
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item cancel; ///< count of requests canceled
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item errors; ///< count of response errcodes
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item reads; ///< count of read complete
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item writes; ///< count of write complete
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item stalls; ///< count of io_submit's blocking.
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item bytes_requests; ///< total bytes for requests created
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item bytes_complete; ///< total bytes for requests completed
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item bytes_errors; ///< total bytes for completed w/ errc
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item bytes_cancel; ///< total bytes for cancels
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item bytes_read; ///< total bytes for read completed
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item bytes_write; ///< total bytes for write completed
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item cur_bytes_write; ///< pending write bytes
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item cur_reads; ///< pending reads
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item cur_writes; ///< pending write
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item cur_queued; ///< nr of requests in userspace queue
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item cur_submits; ///< nr requests in flight with kernel
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item max_requests; ///< maximum observed pending requests
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item max_reads; ///< maximum observed pending reads
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item max_writes; ///< maximum observed pending write
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item max_queued; ///< maximum observed in queue.
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item max_submits; ///< maximum observed in flight.
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stats();
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};
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struct [[gnu::visibility("hidden")]]
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ircd::fs::aio::init
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{
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static size_t query_max_events();
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init();
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~init() noexcept;
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};
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