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/*-
* Copyright (c) 2014-2017 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __evict_stat_walk --
* Walk all the pages in cache for a dhandle gathering stats information
*/
static void
__evict_stat_walk(WT_SESSION_IMPL *session)
{
WT_BTREE *btree;
WT_CACHE *cache;
WT_PAGE *page;
WT_REF *next_walk;
uint64_t dsk_size, gen_gap, gen_gap_max, gen_gap_sum, max_pagesize;
uint64_t min_written_size, num_memory, num_not_queueable, num_queued;
uint64_t num_smaller_allocsz, pages_clean, pages_dirty, pages_internal;
uint64_t pages_leaf, seen_count, size, visited_count;
uint64_t visited_age_gap_sum, unvisited_count, unvisited_age_gap_sum;
uint64_t walk_count, written_size_cnt, written_size_sum;
btree = S2BT(session);
cache = S2C(session)->cache;
next_walk = NULL;
dsk_size = gen_gap = gen_gap_max = gen_gap_sum = max_pagesize = 0;
num_memory = num_not_queueable = num_queued = 0;
num_smaller_allocsz = pages_clean = pages_dirty = pages_internal = 0;
pages_leaf = seen_count = size = visited_count = 0;
visited_age_gap_sum = unvisited_count = unvisited_age_gap_sum = 0;
walk_count = written_size_cnt = written_size_sum = 0;
min_written_size = UINT64_MAX;
while (__wt_tree_walk_count(session, &next_walk, &walk_count,
WT_READ_CACHE | WT_READ_NO_EVICT |
WT_READ_NO_GEN | WT_READ_NO_WAIT) == 0 &&
next_walk != NULL) {
++seen_count;
page = next_walk->page;
size = page->memory_footprint;
if (__wt_page_is_modified(page))
++pages_dirty;
else
++pages_clean;
if (!__wt_ref_is_root(next_walk) &&
!__wt_page_can_evict(session, next_walk, NULL))
++num_not_queueable;
if (F_ISSET_ATOMIC(page, WT_PAGE_EVICT_LRU))
++num_queued;
if (size > max_pagesize)
max_pagesize = size;
dsk_size = page->dsk != NULL ? page->dsk->mem_size : 0;
if (dsk_size != 0) {
if (dsk_size < btree->allocsize)
++num_smaller_allocsz;
if (dsk_size < min_written_size)
min_written_size = dsk_size;
++written_size_cnt;
written_size_sum += dsk_size;
} else
++num_memory;
if (WT_PAGE_IS_INTERNAL(page))
++pages_internal;
else
++pages_leaf;
/* Skip root pages since they are never considered */
if (__wt_ref_is_root(next_walk))
continue;
if (page->evict_pass_gen == 0) {
unvisited_age_gap_sum +=
(cache->evict_pass_gen - page->cache_create_gen);
++unvisited_count;
} else {
visited_age_gap_sum +=
(cache->evict_pass_gen - page->cache_create_gen);
gen_gap = cache->evict_pass_gen - page->evict_pass_gen;
if (gen_gap > gen_gap_max)
gen_gap_max = gen_gap;
gen_gap_sum += gen_gap;
++visited_count;
}
}
WT_STAT_DATA_SET(session, cache_state_gen_avg_gap,
visited_count == 0 ? 0 : gen_gap_sum / visited_count);
WT_STAT_DATA_SET(session, cache_state_avg_unvisited_age,
unvisited_count == 0 ? 0 : unvisited_age_gap_sum / unvisited_count);
WT_STAT_DATA_SET(session, cache_state_avg_visited_age,
visited_count == 0 ? 0 : visited_age_gap_sum / visited_count);
WT_STAT_DATA_SET(session, cache_state_avg_written_size,
written_size_cnt == 0 ? 0 : written_size_sum / written_size_cnt);
WT_STAT_DATA_SET(session, cache_state_gen_max_gap, gen_gap_max);
WT_STAT_DATA_SET(session, cache_state_max_pagesize, max_pagesize);
WT_STAT_DATA_SET(session,
cache_state_min_written_size, min_written_size);
WT_STAT_DATA_SET(session, cache_state_memory, num_memory);
WT_STAT_DATA_SET(session, cache_state_queued, num_queued);
WT_STAT_DATA_SET(session, cache_state_not_queueable, num_not_queueable);
WT_STAT_DATA_SET(session, cache_state_pages, walk_count);
WT_STAT_DATA_SET(session, cache_state_pages_clean, pages_clean);
WT_STAT_DATA_SET(session, cache_state_pages_dirty, pages_dirty);
WT_STAT_DATA_SET(session, cache_state_pages_internal, pages_internal);
WT_STAT_DATA_SET(session, cache_state_pages_leaf, pages_leaf);
WT_STAT_DATA_SET(session,
cache_state_refs_skipped, walk_count - seen_count);
WT_STAT_DATA_SET(session,
cache_state_smaller_alloc_size, num_smaller_allocsz);
WT_STAT_DATA_SET(session,
cache_state_unvisited_count, unvisited_count);
}
/*
* __wt_curstat_cache_walk --
* Initialize the statistics for a cache cache_walk pass.
*/
void
__wt_curstat_cache_walk(WT_SESSION_IMPL *session)
{
WT_BTREE *btree;
WT_CONNECTION_IMPL *conn;
WT_PAGE_INDEX *root_idx;
btree = S2BT(session);
conn = S2C(session);
/* Set statistics that don't require walking the cache. */
WT_STAT_DATA_SET(session,
cache_state_gen_current, conn->cache->evict_pass_gen);
/* Root page statistics */
root_idx = WT_INTL_INDEX_GET_SAFE(btree->root.page);
WT_STAT_DATA_SET(session,
cache_state_root_entries, root_idx->entries);
WT_STAT_DATA_SET(session,
cache_state_root_size, btree->root.page->memory_footprint);
__evict_stat_walk(session);
}
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