638 lines
22 KiB
C++
638 lines
22 KiB
C++
/*
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Copyright (c) 2007-2016, Arvid Norberg, Steven Siloti
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_DISK_IO_THREAD
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#define TORRENT_DISK_IO_THREAD
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#include "libtorrent/config.hpp"
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#include "libtorrent/storage.hpp"
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#include "libtorrent/allocator.hpp"
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#include "libtorrent/io_service.hpp"
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#include "libtorrent/sliding_average.hpp"
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#include "libtorrent/disk_io_thread_pool.hpp"
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#include "libtorrent/disk_io_job.hpp"
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#include "libtorrent/disk_job_pool.hpp"
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#include "libtorrent/block_cache.hpp"
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#include "libtorrent/file_pool.hpp"
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#include "libtorrent/disk_interface.hpp"
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#include "libtorrent/performance_counters.hpp"
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#include "libtorrent/aux_/session_settings.hpp"
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#include <mutex>
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#include <condition_variable>
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#include <atomic>
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#include <memory>
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#include <vector>
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namespace libtorrent
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{
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class alert;
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struct add_torrent_params;
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struct counters;
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class alert_manager;
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struct cached_piece_info
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{
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piece_manager* storage;
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// holds one entry for each block in this piece. ``true`` represents
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// the data for that block being in the disk cache and ``false`` means it's not.
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std::vector<bool> blocks;
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// the time when a block was last written to this piece. The older
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// a piece is, the more likely it is to be flushed to disk.
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time_point last_use;
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// The index of the next block that needs to be hashed.
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// Blocks are hashed as they are downloaded in order to not
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// have to re-read them from disk once the piece is complete, to
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// compare its hash against the hashes in the .torrent file.
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int next_to_hash;
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// the piece index for this cache entry.
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int piece;
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enum kind_t { read_cache = 0, write_cache = 1, volatile_read_cache = 2 };
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// specifies if this piece is part of the read cache or the write cache.
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kind_t kind;
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bool need_readback;
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};
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typedef tailqueue<disk_io_job> jobqueue_t;
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// this struct holds a number of statistics counters
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// relevant for the disk io thread and disk cache.
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struct TORRENT_EXPORT cache_status
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{
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// initializes all counters to 0
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cache_status()
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: pieces()
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#ifndef TORRENT_NO_DEPRECATE
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, blocks_written(0)
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, writes(0)
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, blocks_read(0)
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, blocks_read_hit(0)
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, reads(0)
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, queued_bytes(0)
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, cache_size(0)
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, write_cache_size(0)
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, read_cache_size(0)
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, pinned_blocks(0)
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, total_used_buffers(0)
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, average_read_time(0)
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, average_write_time(0)
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, average_hash_time(0)
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, average_job_time(0)
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, cumulative_job_time(0)
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, cumulative_read_time(0)
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, cumulative_write_time(0)
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, cumulative_hash_time(0)
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, total_read_back(0)
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, read_queue_size(0)
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, blocked_jobs(0)
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, queued_jobs(0)
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, peak_queued(0)
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, pending_jobs(0)
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, num_jobs(0)
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, num_read_jobs(0)
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, num_write_jobs(0)
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, arc_mru_size(0)
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, arc_mru_ghost_size(0)
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, arc_mfu_size(0)
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, arc_mfu_ghost_size(0)
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, arc_write_size(0)
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, arc_volatile_size(0)
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, num_writing_threads(0)
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#endif
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{
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#ifndef TORRENT_NO_DEPRECATE
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memset(num_fence_jobs, 0, sizeof(num_fence_jobs));
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#endif
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}
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std::vector<cached_piece_info> pieces;
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#ifndef TORRENT_NO_DEPRECATE
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// the total number of 16 KiB blocks written to disk
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// since this session was started.
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int blocks_written;
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// the total number of write operations performed since this
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// session was started.
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//
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// The ratio (``blocks_written`` - ``writes``) / ``blocks_written`` represents
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// the number of saved write operations per total write operations. i.e. a kind
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// of cache hit ratio for the write cahe.
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int writes;
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// the number of blocks that were requested from the
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// bittorrent engine (from peers), that were served from disk or cache.
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int blocks_read;
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// the number of blocks that was just copied from the read cache
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//
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// The ratio ``blocks_read_hit`` / ``blocks_read`` is the cache hit ratio
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// for the read cache.
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int blocks_read_hit;
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// the number of read operations used
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int reads;
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// the number of bytes queued for writing, including bytes
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// submitted to the OS for writing, but not yet complete
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mutable std::int64_t queued_bytes;
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// the number of 16 KiB blocks currently in the disk cache (both read and write).
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// This includes both read and write cache.
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int cache_size;
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// the number of blocks in the cache used for write cache
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int write_cache_size;
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// the number of 16KiB blocks in the read cache.
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int read_cache_size;
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// the number of blocks with a refcount > 0, i.e.
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// they may not be evicted
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int pinned_blocks;
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// the total number of buffers currently in use.
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// This includes the read/write disk cache as well as send and receive buffers
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// used in peer connections.
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mutable int total_used_buffers;
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// the number of microseconds an average disk I/O job
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// has to wait in the job queue before it get processed.
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// the time read jobs takes on average to complete
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// (not including the time in the queue), in microseconds. This only measures
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// read cache misses.
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int average_read_time;
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// the time write jobs takes to complete, on average,
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// in microseconds. This does not include the time the job sits in the disk job
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// queue or in the write cache, only blocks that are flushed to disk.
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int average_write_time;
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// the time hash jobs takes to complete on average, in
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// microseconds. Hash jobs include running SHA-1 on the data (which for the most
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// part is done incrementally) and sometimes reading back parts of the piece. It
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// also includes checking files without valid resume data.
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int average_hash_time;
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int average_job_time;
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// the number of milliseconds spent in all disk jobs, and specific ones
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// since the start of the session. Times are specified in milliseconds
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int cumulative_job_time;
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int cumulative_read_time;
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int cumulative_write_time;
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int cumulative_hash_time;
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// the number of blocks that had to be read back from disk because
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// they were flushed before the SHA-1 hash got to hash them. If this
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// is large, a larger cache could significantly improve performance
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int total_read_back;
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// number of read jobs in the disk job queue
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int read_queue_size;
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// number of jobs blocked because of a fence
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int blocked_jobs;
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// number of jobs waiting to be issued (m_to_issue)
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// average over 30 seconds
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int queued_jobs;
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// largest ever seen number of queued jobs
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int peak_queued;
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// number of jobs waiting to complete (m_pending)
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// average over 30 seconds
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int pending_jobs;
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// total number of disk job objects allocated right now
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int num_jobs;
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// total number of disk read job objects allocated right now
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int num_read_jobs;
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// total number of disk write job objects allocated right now
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int num_write_jobs;
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// ARC cache stats. All of these counters are in number of pieces
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// not blocks. A piece does not necessarily correspond to a certain
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// number of blocks. The pieces in the ghost list never have any
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// blocks in them
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int arc_mru_size;
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int arc_mru_ghost_size;
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int arc_mfu_size;
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int arc_mfu_ghost_size;
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int arc_write_size;
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int arc_volatile_size;
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// the number of threads currently writing to disk
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int num_writing_threads;
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// counts only fence jobs that are currently blocking jobs
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// not fences that are themself blocked
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int num_fence_jobs[disk_io_job::num_job_ids];
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#endif
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};
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// this is a singleton consisting of the thread and a queue
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// of disk io jobs
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struct TORRENT_EXTRA_EXPORT disk_io_thread final
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: disk_job_pool
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, disk_interface
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, buffer_allocator_interface
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{
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disk_io_thread(io_service& ios
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, counters& cnt
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, void* userdata
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, int block_size = 16 * 1024);
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~disk_io_thread();
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void set_settings(settings_pack const* sett, alert_manager& alerts);
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void set_num_threads(int i);
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void abort(bool wait);
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void async_read(piece_manager* storage, peer_request const& r
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, std::function<void(disk_io_job const*)> handler, void* requester
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, int flags = 0) override;
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void async_write(piece_manager* storage, peer_request const& r
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, disk_buffer_holder buffer
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, std::function<void(disk_io_job const*)> handler
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, int flags = 0) override;
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void async_hash(piece_manager* storage, int piece, int flags
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, std::function<void(disk_io_job const*)> handler, void* requester) override;
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void async_move_storage(piece_manager* storage, std::string const& p, int flags
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, std::function<void(disk_io_job const*)> handler) override;
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void async_release_files(piece_manager* storage
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, std::function<void(disk_io_job const*)> handler
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= std::function<void(disk_io_job const*)>()) override;
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void async_delete_files(piece_manager* storage, int options
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, std::function<void(disk_io_job const*)> handler) override;
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void async_check_files(piece_manager* storage
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, add_torrent_params const* resume_data
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, std::vector<std::string>& links
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, std::function<void(disk_io_job const*)> handler) override;
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void async_rename_file(piece_manager* storage, int index, std::string const& name
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, std::function<void(disk_io_job const*)> handler) override;
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void async_stop_torrent(piece_manager* storage
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, std::function<void(disk_io_job const*)> handler) override;
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#ifndef TORRENT_NO_DEPRECATE
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void async_cache_piece(piece_manager* storage, int piece
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, std::function<void(disk_io_job const*)> handler) override;
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void async_finalize_file(piece_manager* storage, int file
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, std::function<void(disk_io_job const*)> handler
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= std::function<void(disk_io_job const*)>()) override;
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#endif
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void async_flush_piece(piece_manager* storage, int piece
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, std::function<void(disk_io_job const*)> handler
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= std::function<void(disk_io_job const*)>()) override;
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void async_set_file_priority(piece_manager* storage
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, std::vector<std::uint8_t> const& prio
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, std::function<void(disk_io_job const*)> handler) override;
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void async_load_torrent(add_torrent_params* params
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, std::function<void(disk_io_job const*)> handler) override;
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void async_tick_torrent(piece_manager* storage
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, std::function<void(disk_io_job const*)> handler) override;
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void clear_read_cache(piece_manager* storage) override;
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void async_clear_piece(piece_manager* storage, int index
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, std::function<void(disk_io_job const*)> handler) override;
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// this is not asynchronous and requires that the piece does not
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// have any pending buffers. It's meant to be used for pieces that
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// were just read and hashed and failed the hash check.
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// there should be no read-operations left, and all buffers should
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// be discardable
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void clear_piece(piece_manager* storage, int index) override;
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// implements buffer_allocator_interface
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void reclaim_block(block_cache_reference ref) override;
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void free_disk_buffer(char* buf) override { m_disk_cache.free_buffer(buf); }
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disk_buffer_holder allocate_disk_buffer(char const* category) override
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{
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bool exceed = false;
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return allocate_disk_buffer(exceed, std::shared_ptr<disk_observer>(), category);
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}
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void trigger_cache_trim();
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disk_buffer_holder allocate_disk_buffer(bool& exceeded, std::shared_ptr<disk_observer> o
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, char const* category) override;
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bool exceeded_cache_use() const
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{ return m_disk_cache.exceeded_max_size(); }
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void update_stats_counters(counters& c) const override;
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void get_cache_info(cache_status* ret, bool no_pieces = true
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, piece_manager const* storage = 0) const override;
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// this submits all queued up jobs to the thread
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void submit_jobs();
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block_cache* cache() { return &m_disk_cache; }
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#if TORRENT_USE_ASSERTS
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bool is_disk_buffer(char* buffer) const override
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{ return m_disk_cache.is_disk_buffer(buffer); }
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#endif
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enum thread_type_t {
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generic_thread,
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hasher_thread
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};
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void thread_fun(thread_type_t type, io_service::work w);
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virtual file_pool& files() override { return m_file_pool; }
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io_service& get_io_service() { return m_ios; }
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int prep_read_job_impl(disk_io_job* j, bool check_fence = true);
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#if TORRENT_USE_INVARIANT_CHECKS
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void check_invariant() const;
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#endif
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void maybe_issue_queued_read_jobs(cached_piece_entry* pe,
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jobqueue_t& completed_jobs);
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int do_read(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_uncached_read(disk_io_job* j);
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int do_write(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_uncached_write(disk_io_job* j);
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int do_hash(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_uncached_hash(disk_io_job* j);
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int do_move_storage(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_release_files(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_delete_files(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_check_fastresume(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_rename_file(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_stop_torrent(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_read_and_hash(disk_io_job* j, jobqueue_t& completed_jobs);
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#ifndef TORRENT_NO_DEPRECATE
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int do_cache_piece(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_finalize_file(disk_io_job* j, jobqueue_t& completed_jobs);
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#endif
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int do_flush_piece(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_flush_hashed(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_flush_storage(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_trim_cache(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_file_priority(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_load_torrent(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_clear_piece(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_tick(disk_io_job* j, jobqueue_t& completed_jobs);
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int do_resolve_links(disk_io_job* j, jobqueue_t& completed_jobs);
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void call_job_handlers(void* userdata);
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private:
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struct job_queue : pool_thread_interface
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{
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job_queue(disk_io_thread& owner, thread_type_t type)
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: m_owner(owner), m_type(type)
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{}
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virtual void notify_all() override
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{
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m_job_cond.notify_all();
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}
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virtual void thread_fun(io_service::work work) override
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{ m_owner.thread_fun(m_type, work); }
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disk_io_thread& m_owner;
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thread_type_t const m_type;
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// used to wake up the disk IO thread when there are new
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// jobs on the job queue (m_queued_jobs)
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std::condition_variable m_job_cond;
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// jobs queued for servicing
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jobqueue_t m_queued_jobs;
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};
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enum return_value_t
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{
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// the do_* functions can return this to indicate the disk
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// job did not complete immediately, and shouldn't be posted yet
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defer_handler = -200,
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// the job cannot be completed right now, put it back in the
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// queue and try again later
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retry_job = -201
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};
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// returns true if the thread should exit
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static bool wait_for_job(job_queue& jobq, disk_io_thread_pool& threads
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, std::unique_lock<std::mutex>& l);
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void add_completed_job(disk_io_job* j);
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void add_completed_jobs(jobqueue_t& jobs);
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void add_completed_jobs_impl(jobqueue_t& jobs
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, jobqueue_t& completed_jobs);
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void fail_jobs(storage_error const& e, jobqueue_t& jobs_);
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void fail_jobs_impl(storage_error const& e, jobqueue_t& src, jobqueue_t& dst);
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void check_cache_level(std::unique_lock<std::mutex>& l, jobqueue_t& completed_jobs);
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void perform_job(disk_io_job* j, jobqueue_t& completed_jobs);
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// this queues up another job to be submitted
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void add_job(disk_io_job* j, bool user_add = true);
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void add_fence_job(piece_manager* storage, disk_io_job* j
|
|
, bool user_add = true);
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|
|
|
// assumes l is locked (cache std::mutex).
|
|
// writes out the blocks [start, end) (releases the lock
|
|
// during the file operation)
|
|
int flush_range(cached_piece_entry* p, int start, int end
|
|
, jobqueue_t& completed_jobs, std::unique_lock<std::mutex>& l);
|
|
|
|
// low level flush operations, used by flush_range
|
|
int build_iovec(cached_piece_entry* pe, int start, int end
|
|
, file::iovec_t* iov, int* flushing, int block_base_index = 0);
|
|
void flush_iovec(cached_piece_entry* pe, file::iovec_t const* iov, int const* flushing
|
|
, int num_blocks, storage_error& error);
|
|
void iovec_flushed(cached_piece_entry* pe
|
|
, int* flushing, int num_blocks, int block_offset
|
|
, storage_error const& error
|
|
, jobqueue_t& completed_jobs);
|
|
|
|
// assumes l is locked (the cache std::mutex).
|
|
// assumes pe->hash to be set.
|
|
// If there are new blocks in piece 'pe' that have not been
|
|
// hashed by the partial_hash object attached to this piece,
|
|
// the piece will
|
|
void kick_hasher(cached_piece_entry* pe, std::unique_lock<std::mutex>& l);
|
|
|
|
// flags to pass in to flush_cache()
|
|
enum flush_flags_t
|
|
{
|
|
// only flush read cache (this is cheap)
|
|
flush_read_cache = 1,
|
|
// flush read cache, and write cache
|
|
flush_write_cache = 2,
|
|
// flush read cache, delete write cache without flushing to disk
|
|
flush_delete_cache = 4,
|
|
// expect all pieces for the storage to have been
|
|
// cleared when flush_cache() returns. This is only
|
|
// used for asserts and only applies for fence jobs
|
|
flush_expect_clear = 8
|
|
};
|
|
void flush_cache(piece_manager* storage, std::uint32_t flags, jobqueue_t& completed_jobs, std::unique_lock<std::mutex>& l);
|
|
void flush_expired_write_blocks(jobqueue_t& completed_jobs, std::unique_lock<std::mutex>& l);
|
|
void flush_piece(cached_piece_entry* pe, int flags, jobqueue_t& completed_jobs, std::unique_lock<std::mutex>& l);
|
|
|
|
int try_flush_hashed(cached_piece_entry* p, int cont_blocks, jobqueue_t& completed_jobs, std::unique_lock<std::mutex>& l);
|
|
|
|
void try_flush_write_blocks(int num, jobqueue_t& completed_jobs, std::unique_lock<std::mutex>& l);
|
|
|
|
// used to batch reclaiming of blocks to once per cycle
|
|
void commit_reclaimed_blocks();
|
|
|
|
void maybe_flush_write_blocks();
|
|
void execute_job(disk_io_job* j);
|
|
void immediate_execute();
|
|
void abort_jobs();
|
|
|
|
// returns the maximum number of threads
|
|
// the actual number of threads may be less
|
|
int num_threads() const;
|
|
job_queue& queue_for_job(disk_io_job* j);
|
|
disk_io_thread_pool& pool_for_job(disk_io_job* j);
|
|
|
|
// set to true once we start shutting down
|
|
std::atomic<bool> m_abort;
|
|
|
|
// this is a counter of how many threads are currently running.
|
|
// it's used to identify the last thread still running while
|
|
// shutting down. This last thread is responsible for cleanup
|
|
// must hold the job mutex to access
|
|
int m_num_running_threads;
|
|
|
|
// std::mutex to protect the m_generic_io_jobs and m_hash_io_jobs lists
|
|
mutable std::mutex m_job_mutex;
|
|
|
|
// most jobs are posted to m_generic_io_jobs
|
|
// but hash jobs are posted to m_hash_io_jobs if m_hash_threads
|
|
// has a non-zero maximum thread count
|
|
job_queue m_generic_io_jobs;
|
|
disk_io_thread_pool m_generic_threads;
|
|
job_queue m_hash_io_jobs;
|
|
disk_io_thread_pool m_hash_threads;
|
|
|
|
aux::session_settings m_settings;
|
|
|
|
// userdata pointer for the complete_job function, which
|
|
// is posted to the network thread when jobs complete
|
|
void* m_userdata;
|
|
|
|
// the last time we expired write blocks from the cache
|
|
time_point m_last_cache_expiry;
|
|
|
|
time_point m_last_file_check;
|
|
|
|
// LRU cache of open files
|
|
file_pool m_file_pool;
|
|
|
|
// disk cache
|
|
mutable std::mutex m_cache_mutex;
|
|
block_cache m_disk_cache;
|
|
enum
|
|
{
|
|
cache_check_idle,
|
|
cache_check_active,
|
|
cache_check_reinvoke
|
|
};
|
|
int m_cache_check_state;
|
|
|
|
// total number of blocks in use by both the read
|
|
// and the write cache. This is not supposed to
|
|
// exceed m_cache_size
|
|
|
|
counters& m_stats_counters;
|
|
|
|
// average read time for cache misses (in microseconds)
|
|
average_accumulator m_read_time;
|
|
|
|
// average write time (in microseconds)
|
|
average_accumulator m_write_time;
|
|
|
|
// average hash time (in microseconds)
|
|
average_accumulator m_hash_time;
|
|
|
|
// average time to serve a job (any job) in microseconds
|
|
average_accumulator m_job_time;
|
|
|
|
// this is the main thread io_service. Callbacks are
|
|
// posted on this in order to have them execute in
|
|
// the main thread.
|
|
io_service& m_ios;
|
|
|
|
// used to rate limit disk performance warnings
|
|
time_point m_last_disk_aio_performance_warning;
|
|
|
|
// jobs that are completed are put on this queue
|
|
// whenever the queue size grows from 0 to 1
|
|
// a message is posted to the network thread, which
|
|
// will then drain the queue and execute the jobs'
|
|
// handler functions
|
|
std::mutex m_completed_jobs_mutex;
|
|
jobqueue_t m_completed_jobs;
|
|
|
|
// these are blocks that have been returned by the main thread
|
|
// but they haven't been freed yet. This is used to batch
|
|
// reclaiming of blocks, to only need one std::mutex lock per cycle
|
|
std::vector<block_cache_reference> m_blocks_to_reclaim;
|
|
|
|
// when this is true, there is an outstanding message in the
|
|
// message queue that will reclaim all blocks in
|
|
// m_blocks_to_reclaim, there's no need to send another one
|
|
bool m_outstanding_reclaim_message;
|
|
#if TORRENT_USE_ASSERTS
|
|
int m_magic;
|
|
std::atomic<bool> m_jobs_aborted;
|
|
#endif
|
|
};
|
|
}
|
|
|
|
#endif
|