/*
* __evict_force_check --
* Check if a page matches the criteria for forced eviction.
*/
static int
__evict_force_check(WT_SESSION_IMPL *session, WT_REF *ref)
{
WT_BTREE *btree;
WT_PAGE *page;
btree = S2BT(session);
page = ref->page;
/* Leaf pages only. */
if (WT_PAGE_IS_INTERNAL(page))
return (0);
/*
* It's hard to imagine a page with a huge memory footprint that has
* never been modified, but check to be sure.
*/
if (page->modify == NULL)
return (0);
/* Pages are usually small enough, check that first. */
if (page->memory_footprint < btree->splitmempage)
return (0);
else if (page->memory_footprint < btree->maxmempage)
return (__wt_leaf_page_can_split(session, page));
/* Trigger eviction on the next page release. */
__wt_page_evict_soon(page);
/* Bump the oldest ID, we're about to do some visibility checks. */
__wt_txn_update_oldest(session, false);
/* If eviction cannot succeed, don't try. */
return (__wt_page_can_evict(session, ref, NULL));
}
/*
* __evict_force_check --
* Check if a page matches the criteria for forced eviction.
*/
static bool
__evict_force_check(WT_SESSION_IMPL *session, WT_REF *ref)
{
WT_BTREE *btree;
WT_PAGE *page;
btree = S2BT(session);
page = ref->page;
/* Leaf pages only. */
if (WT_PAGE_IS_INTERNAL(page))
return (false);
/*
* It's hard to imagine a page with a huge memory footprint that has
* never been modified, but check to be sure.
*/
if (page->modify == NULL)
return (false);
/* Pages are usually small enough, check that first. */
if (page->memory_footprint < btree->splitmempage)
return (false);
/*
* If this session has more than one hazard pointer, eviction will fail
* and there is no point trying.
*/
if (__wt_hazard_count(session, page) > 1)
return (false);
/*
* If we have already tried and the transaction state has not moved on,
* eviction is highly likely to fail.
*/
if (page->modify->last_eviction_id == __wt_txn_oldest_id(session))
return (false);
if (page->memory_footprint < btree->maxmempage)
return (__wt_leaf_page_can_split(session, page));
/* Trigger eviction on the next page release. */
__wt_page_evict_soon(session, ref);
/* Bump the oldest ID, we're about to do some visibility checks. */
WT_IGNORE_RET(__wt_txn_update_oldest(session, 0));
/* If eviction cannot succeed, don't try. */
return (__wt_page_can_evict(session, ref, NULL));
}
