/*
* __wt_cache_config --
* Configure or reconfigure the current cache and shared cache.
*/
int
__wt_cache_config(WT_SESSION_IMPL *session, bool reconfigure, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_CONNECTION_IMPL *conn;
bool now_shared, was_shared;
conn = S2C(session);
WT_ASSERT(session, conn->cache != NULL);
WT_RET(__wt_config_gets_none(session, cfg, "shared_cache.name", &cval));
now_shared = cval.len != 0;
was_shared = F_ISSET(conn, WT_CONN_CACHE_POOL);
/* Cleanup if reconfiguring */
if (reconfigure && was_shared && !now_shared)
/* Remove ourselves from the pool if necessary */
WT_RET(__wt_conn_cache_pool_destroy(session));
else if (reconfigure && !was_shared && now_shared)
/*
* Cache size will now be managed by the cache pool - the
* start size always needs to be zero to allow the pool to
* manage how much memory is in-use.
*/
conn->cache_size = 0;
/*
* Always setup the local cache - it's used even if we are
* participating in a shared cache.
*/
WT_RET(__cache_config_local(session, now_shared, cfg));
if (now_shared) {
WT_RET(__wt_cache_pool_config(session, cfg));
WT_ASSERT(session, F_ISSET(conn, WT_CONN_CACHE_POOL));
if (!was_shared)
WT_RET(__wt_conn_cache_pool_open(session));
}
/*
* Resize the thread group if reconfiguring, otherwise the thread group
* will be initialized as part of creating the cache.
*/
if (reconfigure)
WT_RET(__wt_thread_group_resize(
session, &conn->evict_threads,
conn->evict_threads_min, conn->evict_threads_max,
WT_THREAD_CAN_WAIT | WT_THREAD_PANIC_FAIL));
return (0);
}
/*
* __wt_cache_config --
* Configure or reconfigure the current cache and shared cache.
*/
int
__wt_cache_config(WT_SESSION_IMPL *session, int reconfigure, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_CONNECTION_IMPL *conn;
int now_shared, was_shared;
conn = S2C(session);
WT_ASSERT(session, conn->cache != NULL);
WT_RET(__wt_config_gets_none(session, cfg, "shared_cache.name", &cval));
now_shared = cval.len != 0;
was_shared = F_ISSET(conn, WT_CONN_CACHE_POOL);
/* Cleanup if reconfiguring */
if (reconfigure && was_shared && !now_shared)
/* Remove ourselves from the pool if necessary */
WT_RET(__wt_conn_cache_pool_destroy(session));
else if (reconfigure && !was_shared && now_shared)
/*
* Cache size will now be managed by the cache pool - the
* start size always needs to be zero to allow the pool to
* manage how much memory is in-use.
*/
conn->cache_size = 0;
/*
* Always setup the local cache - it's used even if we are
* participating in a shared cache.
*/
WT_RET(__cache_config_local(session, now_shared, cfg));
if (now_shared) {
WT_RET(__wt_cache_pool_config(session, cfg));
WT_ASSERT(session, F_ISSET(conn, WT_CONN_CACHE_POOL));
if (!was_shared)
WT_RET(__wt_conn_cache_pool_open(session));
}
return (0);
}
/*读取配置信息，将配置信息设置到当前conn的cache信息*/
int __wt_cache_config(WT_SESSION_IMPL *session, int reconfigure, const char *cfg[])
{
WT_CONFIG_ITEM cval;
WT_CONNECTION_IMPL *conn;
int now_shared, was_shared;
conn = S2C(session);
WT_ASSERT(session, conn->cache != NULL);
WT_RET(__wt_config_gets_none(session, cfg, "shared_cache.name", &cval));
now_shared = cval.len != 0;
was_shared = F_ISSET(conn, WT_CONN_CACHE_POOL);
/* Cleanup if reconfiguring */
if (reconfigure && was_shared && !now_shared)
/* Remove ourselves from the pool if necessary */
WT_RET(__wt_conn_cache_pool_destroy(session)); /*如果原来是cache pool管理connection cache,现在的配置设置成独立的cache管理，那么从cache pool中删除管理关系*/
else if (reconfigure && !was_shared && now_shared)
/*
* Cache size will now be managed by the cache pool - the
* start size always needs to be zero to allow the pool to
* manage how much memory is in-use.
*/
conn->cache_size = 0;
/*配置connection的cache*/
WT_RET(__cache_config_local(session, now_shared, cfg));
if (now_shared) {
WT_RET(__wt_cache_pool_config(session, cfg)); /*对cache pool的配置更新*/
WT_ASSERT(session, F_ISSET(conn, WT_CONN_CACHE_POOL));
if (!was_shared)
WT_RET(__wt_conn_cache_pool_open(session)); /*将connection cache加入到cache pool当中进行管理*/
}
return 0;
}
