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/*-
* Copyright (c) 2008-2012 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/*
* WT_EVICT_LIST --
* Encapsulation of an eviction candidate.
*/
struct __wt_evict_list {
WT_BTREE *btree; /* File object */
WT_PAGE *page; /* Page */
};
/*
* WT_EVICT_REQ --
* Encapsulation of a eviction request.
*/
struct __wt_evict_req {
WT_SESSION_IMPL *session; /* Requesting thread */
WT_BTREE *btree; /* Btree */
WT_PAGE *page; /* Single page to flush */
#define WT_EVICT_REQ_CLOSE 0x1 /* Discard pages */
#define WT_EVICT_REQ_PAGE 0x2 /* Force out a page */
uint32_t flags;
};
/*
* WiredTiger cache structure.
*/
struct __wt_cache {
/*
* Different threads read/write pages to/from the cache and create pages
* in the cache, so we cannot know precisely how much memory is in use
* at any specific time. However, even though the values don't have to
* be exact, they can't be garbage, we track what comes in and what goes
* out and calculate the difference as needed.
*/
uint64_t bytes_read; /* Bytes/pages read by read server */
uint64_t pages_read;
uint64_t bytes_inmem; /* Bytes/pages created in memory */
uint64_t bytes_evict; /* Bytes/pages discarded by eviction */
uint64_t pages_evict;
/*
* Read information.
*/
uint32_t read_gen; /* Page read generation (LRU) */
/*
* Eviction thread information.
*/
WT_CONDVAR *evict_cond; /* Cache eviction server mutex */
WT_SPINLOCK lru_lock; /* Manage the eviction list. */
WT_EVICT_LIST *evict; /* Pages being tracked for eviction */
WT_EVICT_LIST *evict_current; /* Current page to be evicted */
size_t evict_allocated; /* Bytes allocated */
uint32_t evict_entries; /* Total evict slots */
u_int eviction_trigger; /* Percent to trigger eviction. */
u_int eviction_target; /* Percent to end eviction. */
WT_EVICT_REQ *evict_request; /* Eviction requests:
slot available if session is NULL */
uint32_t max_evict_request; /* Size of the evict request array */
};
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