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/*-
* Copyright (c) 2014-2016 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __cache_config_local --
* Configure the underlying cache.
*/
static int
__cache_config_local(WT_SESSION_IMPL *session, bool shared, const char *cfg[])
{
WT_CACHE *cache;
WT_CONFIG_ITEM cval;
WT_CONNECTION_IMPL *conn;
uint32_t evict_workers_max, evict_workers_min;
conn = S2C(session);
cache = conn->cache;
/*
* If not using a shared cache configure the cache size, otherwise
* check for a reserved size. All other settings are independent of
* whether we are using a shared cache or not.
*/
if (!shared) {
WT_RET(__wt_config_gets(session, cfg, "cache_size", &cval));
conn->cache_size = (uint64_t)cval.val;
}
WT_RET(__wt_config_gets(session, cfg, "cache_overhead", &cval));
cache->overhead_pct = (u_int)cval.val;
WT_RET(__wt_config_gets(session, cfg, "eviction_target", &cval));
cache->eviction_target = (u_int)cval.val;
WT_RET(__wt_config_gets(session, cfg, "eviction_trigger", &cval));
cache->eviction_trigger = (u_int)cval.val;
WT_RET(__wt_config_gets(session, cfg, "eviction_dirty_target", &cval));
cache->eviction_dirty_target = (u_int)cval.val;
WT_RET(__wt_config_gets(session, cfg, "eviction_dirty_trigger", &cval));
cache->eviction_dirty_trigger = (u_int)cval.val;
/*
* The eviction thread configuration options include the main eviction
* thread and workers. Our implementation splits them out. Adjust for
* the difference when parsing the configuration.
*/
WT_RET(__wt_config_gets(session, cfg, "eviction.threads_max", &cval));
WT_ASSERT(session, cval.val > 0);
evict_workers_max = (uint32_t)cval.val - 1;
WT_RET(__wt_config_gets(session, cfg, "eviction.threads_min", &cval));
WT_ASSERT(session, cval.val > 0);
evict_workers_min = (uint32_t)cval.val - 1;
if (evict_workers_min > evict_workers_max)
WT_RET_MSG(session, EINVAL,
"eviction=(threads_min) cannot be greater than "
"eviction=(threads_max)");
conn->evict_workers_max = evict_workers_max;
conn->evict_workers_min = evict_workers_min;
return (0);
}
/*
* __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));
}
return (0);
}
/*
* __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 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", false, &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_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;
uint64_t inuse, leaf, used;
conn = S2C(session);
cache = conn->cache;
stats = conn->stats;
inuse = __wt_cache_bytes_inuse(cache);
/*
* There are races updating the different cache tracking values so
* be paranoid calculating the leaf byte usage.
*/
used = cache->bytes_overflow + cache->bytes_internal;
leaf = inuse > used ? inuse - used : 0;
WT_STAT_SET(session, stats, cache_bytes_max, conn->cache_size);
WT_STAT_SET(session, stats, cache_bytes_inuse, inuse);
WT_STAT_SET(session, stats, cache_overhead, cache->overhead_pct);
WT_STAT_SET(
session, stats, cache_pages_inuse, __wt_cache_pages_inuse(cache));
WT_STAT_SET(
session, stats, cache_bytes_dirty, __wt_cache_dirty_inuse(cache));
WT_STAT_SET(session, stats,
cache_eviction_maximum_page_size, cache->evict_max_page_size);
WT_STAT_SET(session, stats, cache_pages_dirty, cache->pages_dirty);
WT_STAT_SET(
session, stats, cache_bytes_internal, cache->bytes_internal);
WT_STAT_SET(
session, stats, cache_bytes_overflow, cache->bytes_overflow);
WT_STAT_SET(session, stats, cache_bytes_leaf, leaf);
}
/*
* __wt_cache_destroy --
* Discard the underlying cache.
*/
int
__wt_cache_destroy(WT_SESSION_IMPL *session)
{
WT_CACHE *cache;
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
conn = S2C(session);
cache = conn->cache;
if (cache == NULL)
return (0);
/* The cache should be empty at this point. Complain if not. */
if (cache->pages_inmem != cache->pages_evict)
__wt_errx(session,
"cache server: exiting with %" PRIu64 " pages in "
"memory and %" PRIu64 " pages evicted",
cache->pages_inmem, cache->pages_evict);
if (cache->bytes_inmem != 0)
__wt_errx(session,
"cache server: exiting with %" PRIu64 " bytes in memory",
cache->bytes_inmem);
if (cache->bytes_dirty != 0 || cache->pages_dirty != 0)
__wt_errx(session,
"cache server: exiting with %" PRIu64
" bytes dirty and %" PRIu64 " pages dirty",
cache->bytes_dirty, cache->pages_dirty);
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_queue);
__wt_free(session, conn->cache);
return (ret);
}
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