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/*-
* Copyright (c) 2008-2013 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_cache_config --
* Configure the underlying cache.
*/
int
__wt_cache_config(WT_CONNECTION_IMPL *conn, const char *cfg[])
{
WT_CACHE *cache;
WT_CONFIG_ITEM cval;
WT_DECL_RET;
WT_SESSION_IMPL *session;
session = conn->default_session;
cache = conn->cache;
/*
* If not using a shared cache configure the cache size, otherwise
* check for a reserved size.
*/
if (!F_ISSET(conn, WT_CONN_CACHE_POOL) &&
(ret = __wt_config_gets(session, cfg, "cache_size", &cval)) == 0)
conn->cache_size = (uint64_t)cval.val;
if (F_ISSET(conn, WT_CONN_CACHE_POOL) &&
(ret = __wt_config_gets(session, cfg,
"shared_cache.reserve", &cval)) == 0 && cval.val != 0)
cache->cp_reserved = (uint64_t)cval.val;
else if ((ret = __wt_config_gets(session, cfg,
"shared_cache.chunk", &cval)) == 0)
cache->cp_reserved = (uint64_t)cval.val;
WT_RET_NOTFOUND_OK(ret);
if ((ret =
__wt_config_gets(session, cfg, "eviction_target", &cval)) == 0)
cache->eviction_target = (u_int)cval.val;
WT_RET_NOTFOUND_OK(ret);
if ((ret =
__wt_config_gets(session, cfg, "eviction_trigger", &cval)) == 0)
cache->eviction_trigger = (u_int)cval.val;
WT_RET_NOTFOUND_OK(ret);
if ((ret = __wt_config_gets(
session, cfg, "eviction_dirty_target", &cval)) == 0)
cache->eviction_dirty_target = (u_int)cval.val;
WT_RET_NOTFOUND_OK(ret);
return (0);
}
/*
* __wt_cache_create --
* Create the underlying cache.
*/
int
__wt_cache_create(WT_CONNECTION_IMPL *conn, const char *cfg[])
{
WT_CACHE *cache;
WT_DECL_RET;
WT_SESSION_IMPL *session;
session = conn->default_session;
WT_ASSERT(session, conn->cache == NULL ||
(F_ISSET(conn, WT_CONN_CACHE_POOL) && conn->cache != NULL));
WT_RET(__wt_calloc_def(session, 1, &conn->cache));
cache = conn->cache;
/* Use a common routine for run-time configuration options. */
WT_RET(__wt_cache_config(conn, cfg));
/* Add the configured cache to the cache pool. */
if (F_ISSET(conn, WT_CONN_CACHE_POOL))
WT_RET(__wt_conn_cache_pool_open(session));
/*
* 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(conn));
return (ret);
}
/*
* __wt_cache_stats_update --
* Update the cache statistics for return to the application.
*/
void
__wt_cache_stats_update(WT_SESSION_IMPL *session)
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_CONNECTION_STATS *stats;
conn = S2C(session);
cache = conn->cache;
stats = &conn->stats;
WT_STAT_SET(stats, cache_bytes_max, conn->cache_size);
WT_STAT_SET(stats, cache_bytes_inuse, __wt_cache_bytes_inuse(cache));
WT_STAT_SET(stats, cache_pages_inuse, __wt_cache_pages_inuse(cache));
WT_STAT_SET(stats, cache_bytes_dirty, cache->bytes_dirty);
WT_STAT_SET(stats, cache_pages_dirty, cache->pages_dirty);
}
/*
* __wt_cache_destroy --
* Discard the underlying cache.
*/
int
__wt_cache_destroy(WT_CONNECTION_IMPL *conn)
{
WT_CACHE *cache;
WT_DECL_RET;
WT_SESSION_IMPL *session;
session = conn->default_session;
cache = conn->cache;
if (cache == NULL)
return (0);
WT_TRET(__wt_cond_destroy(session, &cache->evict_cond));
WT_TRET(__wt_cond_destroy(session, &cache->evict_waiter_cond));
__wt_spin_destroy(session, &cache->evict_lock);
__wt_spin_destroy(session, &cache->evict_walk_lock);
__wt_free(session, cache->evict);
__wt_free(session, conn->cache);
return (ret);
}
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