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https://github.com/schoebel/mars
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c319230fa1
Dastically boost random write performance on RAID controllers with BBUs. Writeback is only performed when there is no IO contention / starvation. The old IO contention controller was suited to workstations. Now server loads are well-controlled even when BBUs are present.
100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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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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#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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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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//#define USE_CLEVER_SYNC // TODO: NYI (should result in better write performance)
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#ifdef USE_CLEVER_SYNC
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#include "lib_pairing_heap.h"
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_PAIRING_HEAP_TYPEDEF(sync,);
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struct q_sync {
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struct pairing_heap_sync *heap[MARS_PRIO_NR];
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};
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#endif
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struct aio_mref_aspect {
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GENERIC_ASPECT(mref);
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#ifdef USE_CLEVER_SYNC
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struct pairing_heap_sync heap_head;
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#endif
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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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int readahead;
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int linear_cache_size; // in MB
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int linear_cache_rounds;
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bool o_direct;
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bool o_fdsync;
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bool wait_during_fdsync;
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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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spinlock_t lock;
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int queued[MARS_PRIO_NR];
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int queued_sum;
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atomic_t total_enqueue_count;
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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 file *filp;
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int fd; // FIXME: remove this!
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int rounds;
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loff_t min_pos;
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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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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_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 read_count;
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atomic_t write_count;
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atomic_t alloc_count;
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};
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MARS_TYPES(aio);
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#endif
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