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/*-
* Copyright (c) 2008-2012 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/*
* WT_EVICT_ENTRY --
* Encapsulation of an eviction candidate.
*/
struct __wt_evict_entry {
WT_BTREE *btree; /* Enclosing btree object */
WT_PAGE *page; /* Page to flush/evict */
};
/*
* 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 evict_lock; /* Eviction serialization */
u_int eviction_trigger; /* Percent to trigger eviction. */
u_int eviction_target; /* Percent to end eviction */
/*
* LRU eviction list information.
*/
WT_EVICT_ENTRY *evict; /* LRU pages being tracked */
WT_EVICT_ENTRY *evict_current; /* LRU current page to be evicted */
size_t evict_allocated; /* LRU list bytes allocated */
uint32_t evict_entries; /* LRU list eviction slots */
u_int evict_file_next; /* LRU: next file to search */
/*
* Sync/flush request information.
*/
volatile uint64_t sync_request; /* File sync requests */
volatile uint64_t sync_complete;/* File sync requests completed */
};
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