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block: introduce aio task pool

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Common interface for aio task loops. To be used for improving
performance of synchronous io loops in qcow2, block-stream,
copy-on-read, and may be other places.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190916175324.18478-3-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-09-16 20:53:21 +03:00 • committed by Max Reitz
parent ee1e66d957
commit 6e9b225f73
3 changed files with 180 additions and 0 deletions
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54
include/block/aio_task.h Normal file
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/*
* Aio tasks loops
*
* Copyright (c) 2019 Virtuozzo International GmbH.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef BLOCK_AIO_TASK_H
#define BLOCK_AIO_TASK_H
#include "qemu/coroutine.h"
typedef struct AioTaskPool AioTaskPool;
typedef struct AioTask AioTask;
typedef int coroutine_fn (*AioTaskFunc)(AioTask *task);
struct AioTask {
AioTaskPool *pool;
AioTaskFunc func;
int ret;
};
AioTaskPool *coroutine_fn aio_task_pool_new(int max_busy_tasks);
void aio_task_pool_free(AioTaskPool *);
/* error code of failed task or 0 if all is OK */
int aio_task_pool_status(AioTaskPool *pool);
bool aio_task_pool_empty(AioTaskPool *pool);
/* User provides filled @task, however task->pool will be set automatically */
void coroutine_fn aio_task_pool_start_task(AioTaskPool *pool, AioTask *task);
void coroutine_fn aio_task_pool_wait_slot(AioTaskPool *pool);
void coroutine_fn aio_task_pool_wait_one(AioTaskPool *pool);
void coroutine_fn aio_task_pool_wait_all(AioTaskPool *pool);
#endif /* BLOCK_AIO_TASK_H */