80a2ff01f3
Implement cleaner that is used in WriteBack mode. Cleaner is a background agent that does synchronization of data between cache and its cores. Cleaner usually runs every ~20 seconds to perform cleaning. The synchronization is a simmilar operation to OCF management flushes. We need cleaner for WriteBack because only WriteBack mode produces dirty data that cleaner needs to deal with. Cleaner requires adopting trylock() because in current version cleaner uses management lock when performs cleaning, which may lead to deadlocks if cleaner runs on the same thread as management operations. WriteBack mode is fully functional after this change, but persistent metadata support is required to use it for production. Cleaner will run on management thread for now. We plan to implement functionality of chosing a CPU core where cleaner should run. Cleaning policy is not configurable yet. The default is ALRU with 20 sec interval. Change-Id: I35aa7e00c44e0d7a77e64e60df1f66f20be03f55 Signed-off-by: Vitaliy Mysak <vitaliy.mysak@intel.com> Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/448537 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com> Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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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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*
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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
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* distribution.
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* * Neither the name of Intel Corporation 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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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef VBDEV_OCF_CTX_H
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#define VBDEV_OCF_CTX_H
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#include <ocf/ocf.h>
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#include "spdk/thread.h"
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extern ocf_ctx_t vbdev_ocf_ctx;
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#define OCF_WRITE_FLUSH 11
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#define SPDK_OBJECT 1
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/* Context of cache instance */
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struct vbdev_ocf_cache_ctx {
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ocf_queue_t mngt_queue;
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ocf_queue_t cleaner_queue;
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struct spdk_io_channel *management_channel;
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pthread_mutex_t lock;
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env_atomic refcnt;
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};
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void vbdev_ocf_cache_ctx_put(struct vbdev_ocf_cache_ctx *ctx);
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void vbdev_ocf_cache_ctx_get(struct vbdev_ocf_cache_ctx *ctx);
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int vbdev_ocf_ctx_init(void);
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void vbdev_ocf_ctx_cleanup(void);
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/* Thread safe queue creation and deletion
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* These are wrappers for original ocf_queue_create() and ocf_queue_put() */
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int vbdev_ocf_queue_create(ocf_cache_t cache, ocf_queue_t *queue, const struct ocf_queue_ops *ops);
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void vbdev_ocf_queue_put(ocf_queue_t queue);
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#endif
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