/*创建一个connection evict cache*/
int __wt_cache_create(WT_SESSION_IMPL* session, const char* cfg[])
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
conn = S2C(session);
WT_RET(__wt_calloc_one(session, &conn->cache));
cache = conn->cache;
/*对cache进行配置*/
WT_RET(__wt_cache_config(session, 0, cfg));
if (cache->eviction_target >= cache->eviction_trigger)
WT_ERR_MSG(session, EINVAL, "eviction target must be lower than the eviction trigger");
/*创建evict cond信号量*/
WT_ERR(__wt_cond_alloc(session, "cache eviction server", 0, &cache->evict_cond));
WT_ERR(__wt_cond_alloc(session, "eviction waiters", 0, &cache->evict_waiter_cond));
WT_ERR(__wt_spin_init(session, &cache->evict_lock, "cache eviction"));
WT_ERR(__wt_spin_init(session, &cache->evict_walk_lock, "cache walk"));
/* Allocate the LRU eviction queue. */
cache->evict_slots = WT_EVICT_WALK_BASE + WT_EVICT_WALK_INCR;
WT_ERR(__wt_calloc_def(session, cache->evict_slots, &cache->evict));
/*初始化cache stat统计模块*/
__wt_cache_stats_update(session);
return 0;
err:
WT_RET(__wt_cache_destroy(session));
return ret;
}
/*
* __wt_conn_stat_init --
* Initialize the per-connection statistics.
*/
void
__wt_conn_stat_init(WT_SESSION_IMPL *session)
{
WT_CONNECTION_IMPL *conn;
conn = S2C(session);
__wt_cache_stats_update(conn);
}
/*
* __wt_cache_create --
* Create the underlying cache.
*/
int
__wt_cache_create(WT_SESSION_IMPL *session, const char *cfg[])
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
conn = S2C(session);
WT_ASSERT(session, conn->cache == NULL);
WT_RET(__wt_calloc_one(session, &conn->cache));
cache = conn->cache;
/* Use a common routine for run-time configuration options. */
WT_RET(__wt_cache_config(session, false, cfg));
/*
* The lowest possible page read-generation has a special meaning, it
* marks a page for forcible eviction; don't let it happen by accident.
*/
cache->read_gen = WT_READGEN_START_VALUE;
/*
* The target size must be lower than the trigger size or we will never
* get any work done.
*/
if (cache->eviction_target >= cache->eviction_trigger)
WT_ERR_MSG(session, EINVAL,
"eviction target must be lower than the eviction trigger");
WT_ERR(__wt_cond_auto_alloc(session, "cache eviction server",
false, 10000, WT_MILLION, &cache->evict_cond));
WT_ERR(__wt_cond_alloc(session,
"eviction waiters", false, &cache->evict_waiter_cond));
WT_ERR(__wt_spin_init(session, &cache->evict_lock, "cache eviction"));
WT_ERR(__wt_spin_init(session, &cache->evict_walk_lock, "cache walk"));
/* Allocate the LRU eviction queue. */
cache->evict_slots = WT_EVICT_WALK_BASE + WT_EVICT_WALK_INCR;
WT_ERR(__wt_calloc_def(session,
cache->evict_slots, &cache->evict_queue));
/*
* We get/set some values in the cache statistics (rather than have
* two copies), configure them.
*/
__wt_cache_stats_update(session);
return (0);
err: WT_RET(__wt_cache_destroy(session));
return (ret);
}
/*
* __wt_cache_create --
* Create the underlying cache.
*/
int
__wt_cache_create(WT_SESSION_IMPL *session, const char *cfg[])
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
conn = S2C(session);
WT_ASSERT(session, conn->cache == NULL);
WT_RET(__wt_calloc_one(session, &conn->cache));
cache = conn->cache;
/* Use a common routine for run-time configuration options. */
WT_RET(__wt_cache_config(session, 0, cfg));
/*
* The target size must be lower than the trigger size or we will never
* get any work done.
*/
if (cache->eviction_target >= cache->eviction_trigger)
WT_ERR_MSG(session, EINVAL,
"eviction target must be lower than the eviction trigger");
WT_ERR(__wt_cond_alloc(session,
"cache eviction server", 0, &cache->evict_cond));
WT_ERR(__wt_cond_alloc(session,
"eviction waiters", 0, &cache->evict_waiter_cond));
WT_ERR(__wt_spin_init(session, &cache->evict_lock, "cache eviction"));
WT_ERR(__wt_spin_init(session, &cache->evict_walk_lock, "cache walk"));
/* Allocate the LRU eviction queue. */
cache->evict_slots = WT_EVICT_WALK_BASE + WT_EVICT_WALK_INCR;
WT_ERR(__wt_calloc_def(session, cache->evict_slots, &cache->evict));
/*
* We get/set some values in the cache statistics (rather than have
* two copies), configure them.
*/
__wt_cache_stats_update(session);
return (0);
err: WT_RET(__wt_cache_destroy(session));
return (ret);
}
/*
* __wt_cache_create --
* Create the underlying cache.
*/
int
__wt_cache_create(WT_SESSION_IMPL *session, const char *cfg[])
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
int i;
conn = S2C(session);
WT_ASSERT(session, conn->cache == NULL);
WT_RET(__wt_calloc_one(session, &conn->cache));
cache = conn->cache;
/* Use a common routine for run-time configuration options. */
WT_RET(__wt_cache_config(session, false, cfg));
/*
* The lowest possible page read-generation has a special meaning, it
* marks a page for forcible eviction; don't let it happen by accident.
*/
cache->read_gen = WT_READGEN_START_VALUE;
/*
* The target size must be lower than the trigger size or we will never
* get any work done.
*/
if (cache->eviction_target >= cache->eviction_trigger)
WT_ERR_MSG(session, EINVAL,
"eviction target must be lower than the eviction trigger");
WT_ERR(__wt_cond_auto_alloc(session, "cache eviction server",
false, 10000, WT_MILLION, &cache->evict_cond));
WT_ERR(__wt_spin_init(session, &cache->evict_pass_lock, "evict pass"));
WT_ERR(__wt_spin_init(session,
&cache->evict_queue_lock, "cache eviction queue"));
WT_ERR(__wt_spin_init(session, &cache->evict_walk_lock, "cache walk"));
if ((ret = __wt_open_internal_session(conn, "evict pass",
false, WT_SESSION_NO_DATA_HANDLES, &cache->walk_session)) != 0)
WT_ERR_MSG(NULL, ret,
"Failed to create session for eviction walks");
/* Allocate the LRU eviction queue. */
cache->evict_slots = WT_EVICT_WALK_BASE + WT_EVICT_WALK_INCR;
for (i = 0; i < WT_EVICT_QUEUE_MAX; ++i) {
WT_ERR(__wt_calloc_def(session,
cache->evict_slots, &cache->evict_queues[i].evict_queue));
WT_ERR(__wt_spin_init(session,
&cache->evict_queues[i].evict_lock, "cache eviction"));
}
/* Ensure there are always non-NULL queues. */
cache->evict_current_queue = cache->evict_fill_queue =
&cache->evict_queues[0];
cache->evict_other_queue = &cache->evict_queues[1];
cache->evict_urgent_queue = &cache->evict_queues[WT_EVICT_URGENT_QUEUE];
/*
* We get/set some values in the cache statistics (rather than have
* two copies), configure them.
*/
__wt_cache_stats_update(session);
return (0);
err: WT_RET(__wt_cache_destroy(session));
return (ret);
}
