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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;
/* Ignore the cache size if a shared cache is configured. */
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;
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));
if (F_ISSET(conn, WT_CONN_CACHE_POOL))
WT_RET(__wt_conn_cache_pool_open(session));
else
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));
/*
* 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_spin_init(session, &cache->evict_lock);
__wt_spin_init(session, &cache->evict_walk_lock);
/*
* We pull some values from the cache statistics (rather than have two
* copies). Set them.
*/
__wt_cache_stats_update(conn, 0);
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_CONNECTION_IMPL *conn, uint32_t flags)
{
WT_CACHE *cache;
WT_UNUSED(flags);
cache = conn->cache;
WT_STAT_SET(conn->stats, cache_bytes_max, conn->cache_size);
WT_STAT_SET(
conn->stats, cache_bytes_inuse, __wt_cache_bytes_inuse(cache));
WT_STAT_SET(
conn->stats, cache_pages_inuse, __wt_cache_pages_inuse(cache));
WT_STAT_SET(
conn->stats, cache_bytes_dirty, __wt_cache_dirty_bytes(cache));
WT_STAT_SET(
conn->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);
if (cache->evict_cond != NULL)
WT_TRET(__wt_cond_destroy(session, cache->evict_cond));
__wt_spin_destroy(session, &cache->evict_lock);
__wt_spin_destroy(session, &cache->evict_walk_lock);
__wt_free(session, conn->cache);
return (ret);
}
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