13cf871a13
Global free cacheline list is divided into a set of freelists, one per execution context. When attempting to map addres to cache, first the freelist for current execution context is considered (fast path). If current execution context freelist is empty (fast path failure), mapping function attempts to get freelist from other execution context list (slow path). The purpose of this change is improve concurrency in freelist access. It is part of fine granularity metadata lock implementation. Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* Copyright(c) 2012-2018 Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause-Clear
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*/
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#ifndef __LAYER_EVICTION_POLICY_H__
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#define __LAYER_EVICTION_POLICY_H__
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#include "ocf/ocf.h"
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#include "lru.h"
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#include "lru_structs.h"
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#include "../ocf_request.h"
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#define OCF_TO_EVICTION_MIN 128UL
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#define OCF_PENDING_EVICTION_LIMIT 512UL
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struct eviction_policy {
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union {
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struct lru_eviction_policy lru;
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} policy;
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};
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/* Eviction policy metadata per cache line */
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union eviction_policy_meta {
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struct lru_eviction_policy_meta lru;
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} __attribute__((packed));
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/* the caller must hold the metadata lock for all operations
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*
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* For range operations the caller can:
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* set core_id to -1 to purge the whole cache device
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* set core_id to -2 to purge the whole cache partition
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*/
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struct eviction_policy_ops {
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void (*init_cline)(ocf_cache_t cache, ocf_cache_line_t cline);
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void (*rm_cline)(ocf_cache_t cache,
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ocf_cache_line_t cline);
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bool (*can_evict)(ocf_cache_t cache);
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uint32_t (*req_clines)(ocf_cache_t cache,
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ocf_queue_t io_queue, ocf_part_id_t part_id,
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uint32_t cline_no);
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void (*hot_cline)(ocf_cache_t cache,
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ocf_cache_line_t cline);
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void (*init_evp)(ocf_cache_t cache,
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ocf_part_id_t part_id);
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void (*dirty_cline)(ocf_cache_t cache,
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ocf_part_id_t part_id,
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uint32_t cline_no);
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void (*clean_cline)(ocf_cache_t cache,
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ocf_part_id_t part_id,
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uint32_t cline_no);
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const char *name;
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};
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extern struct eviction_policy_ops evict_policy_ops[ocf_eviction_max];
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/*
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* Deallocates space from low priority partitions.
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*
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* Returns -1 on error
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* or the destination partition ID for the free buffers
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* (it matches label and is part of the object (#core_id) IO group)
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*/
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int space_managment_evict_do(ocf_cache_t cache,
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struct ocf_request *req, uint32_t evict_cline_no);
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int space_management_free(ocf_cache_t cache, uint32_t count);
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#endif
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