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Bug#54914: InnoDB: performance drop with innodb_change_buffering=all

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Reduce ibuf_mutex and ibuf_pessimistic_insert_mutex contention further.

Protect ibuf->empty by the insert buffer root page latch, not ibuf_mutex.

ibuf_tree_root_get(): Assert that ibuf_mutex is owned by the
caller. Assert that the stamped page number is correct. Assert that
ibuf->empty agrees with the root page.

ibuf_size_update(): Do not update ibuf->empty.

ibuf_init_at_db_start(): Update ibuf->empty while holding the root page latch.

ibuf_add_free_page(): Return TRUE/FALSE instead of DB_SUCCESS/DB_STRONG_FAIL.

ibuf_remove_free_page(): Release ibuf_pessimistic_insert_mutex as
early as possible.

ibuf_contract_ext(): Rely on a dirty read of ibuf->empty, unless the
server is being shut down. Never acquire ibuf_mutex. Eliminate n_stored.

ibuf_contract_after_insert(): Never acquire ibuf_mutex. Perform dirty
reads of ibuf->size and ibuf->max_size.

ibuf_insert_low(): Only acquire ibuf_mutex for mode==BTR_MODIFY_TREE.
Perform dirty reads of ibuf->size and ibuf->max_size. Update
ibuf->empty while holding the root page latch.

ibuf_delete_rec(): Update ibuf->empty while holding the root page latch.

ibuf_is_empty(): Release ibuf_mutex earlier.
This commit is contained in:
Marko Mäkelä 2010-08-10 13:22:48 +03:00
commit 271e6ae341
2 changed files with 134 additions and 127 deletions
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11
storage/innobase/include/ibuf0ibuf.ic
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@ -46,11 +46,12 @@ struct ibuf_struct{
ulint seg_size; /*!< allocated pages of the file
segment containing ibuf header and
tree */
ibool empty; /*!< after an insert to the ibuf tree
is performed, this is set to FALSE,
and if a contract operation finds
the tree empty, this is set to
TRUE */
ibool empty; /*!< Protected by the page
latch of the root page of the
insert buffer tree
(FSP_IBUF_TREE_ROOT_PAGE_NO). TRUE
if and only if the insert
buffer tree is empty. */
ulint free_list_len; /*!< length of the free list */
ulint height; /*!< tree height */
dict_index_t* index; /*!< insert buffer index */