mirror of https://github.com/schoebel/mars
126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/*
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* MARS Long Distance Replication Software
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*
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* This file is part of MARS project: http://schoebel.github.io/mars/
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*
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* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
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* Copyright (C) 2011-2014 1&1 Internet AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MARS_AIO_H
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#define MARS_AIO_H
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#include <linux/aio.h>
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#include <linux/syscalls.h>
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#include "mars.h"
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#include "lib_mapfree.h"
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#define AIO_SUBMIT_MAX_LATENCY 1000 // 1 ms
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#define AIO_IO_R_MAX_LATENCY 50000 // 50 ms
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#define AIO_IO_W_MAX_LATENCY 150000 // 150 ms
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#define AIO_SYNC_MAX_LATENCY 150000 // 150 ms
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#ifdef CONFIG_MARS_DEBUG
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#define MARS_AIO_DEBUG
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#endif
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extern struct threshold aio_submit_threshold;
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extern struct threshold aio_io_threshold[2];
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extern struct threshold aio_sync_threshold;
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/* aio_sync_mode:
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* 0 = filemap_write_and_wait_range()
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* 1 = fdatasync()
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* 2 = fsync()
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*/
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extern int aio_sync_mode;
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struct aio_mref_aspect {
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GENERIC_ASPECT(mref);
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struct list_head io_head;
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unsigned long long enqueue_stamp;
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long long start_jiffies;
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int resubmit;
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int alloc_len;
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bool do_dealloc;
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};
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struct aio_brick {
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MARS_BRICK(aio);
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// parameters
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bool o_creat;
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bool o_direct;
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bool o_fdsync;
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bool is_static_device;
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};
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struct aio_input {
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MARS_INPUT(aio);
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};
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struct aio_threadinfo {
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struct list_head mref_list[MARS_PRIO_NR];
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struct aio_output *output;
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struct task_struct *thread;
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wait_queue_head_t event;
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wait_queue_head_t terminate_event;
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struct mutex mutex;
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int queued[MARS_PRIO_NR];
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atomic_t queued_sum;
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#ifdef MARS_AIO_DEBUG
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atomic_t total_enqueue_count;
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#endif
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bool should_terminate;
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bool terminated;
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};
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struct aio_output {
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MARS_OUTPUT(aio);
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// private
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struct mapfree_info *mf;
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int fd; // FIXME: remove this!
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struct aio_threadinfo tinfo[3];
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aio_context_t ctxp;
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wait_queue_head_t fdsync_event;
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bool fdsync_active;
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// statistics
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int index;
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int error;
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atomic_t work_count;
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atomic_t read_count;
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atomic_t write_count;
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atomic_t submit_count;
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#ifdef MARS_AIO_DEBUG
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atomic_t total_read_count;
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atomic_t total_write_count;
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atomic_t total_alloc_count;
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atomic_t total_submit_count;
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atomic_t total_again_count;
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atomic_t total_delay_count;
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atomic_t total_msleep_count;
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atomic_t total_fdsync_count;
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atomic_t total_fdsync_wait_count;
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atomic_t total_mapfree_count;
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atomic_t alloc_count;
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#endif
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};
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MARS_TYPES(aio);
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#endif
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