blocks that contains uncompressed and compressed frames. This patch was
designed by Heikki and Inaam, implemented by Inaam, and refined and reviewed
by Marko and Sunny.
buf_buddy_n_frames, buf_buddy_min_n_frames, buf_buddy_max_n_frames: Remove.
buf_page_belongs_to_unzip_LRU(): New predicate:
bpage->zip.data && buf_page_get_state(bpage) == BUF_BLOCK_FILE_PAGE.
buf_pool_t, buf_block_t: Add the linked list unzip_LRU. A block in the
regular LRU list is in unzip_LRU iff buf_page_belongs_to_unzip_LRU() holds.
buf_LRU_free_block(): Add a third return value to refine the case
"cannot free the block".
buf_LRU_search_and_free_block(): Update the documentation to reflect the
implementation.
buf_LRU_stat_t, buf_LRU_stat_cur, buf_LRU_stat_sum, buf_LRU_stat_arr[]:
Statistics for the unzip_LRU algorithm.
buf_LRU_stat_update(): New function: Update the statistics. Called once
per second by srv_error_monitor_thread().
buf_LRU_validate(): Validate the unzip_LRU list as well.
buf_LRU_evict_from_unzip_LRU(): New predicate: Use the unzip_LRU before
falling back to the regular LRU?
buf_LRU_free_from_unzip_LRU_list(), buf_LRU_free_from_common_LRU_list():
Subfunctions of buf_LRU_search_and_free_block().
buf_LRU_search_and_free_block(): Reimplement. Try to evict an uncompressed
page from the unzip_LRU list before falling back to evicting an entire block
from the common LRU list.
buf_unzip_LRU_remove_block_if_needed(): New function.
buf_unzip_LRU_add_block(): New function: Add a block to the unzip_LRU list.
in *.h files, so that the function signatures in the *.h and *.c files fully
match each other.
ut_dulint_sort(): Add a UNIV_INTERN qualifier also to the function definition.
buf_pool->mutex: Rename to buf_pool_mutex, so that the wrappers will have
to be used when changes are merged from other source trees.
buf_pool->zip_mutex: Rename to buf_pool_zip_mutex.
buf_pool_mutex_own(), buf_pool_mutex_enter(), buf_pool_mutex_exit():
Wrappers for buf_pool_mutex.
mutex is temporarily released.
buf_LRU_free_block(), buf_buddy_alloc_clean(): Add an output parameter that
will be assigned TRUE when the buffer pool mutex is released.
This bug was spotted by and fix provided by Sunny.
buf_LRU_block_remove_hashed_page(): Return the new state of the block.
Only call buf_LRU_block_free_hashed_page()
if buf_LRU_block_remove_hashed_page() did not return BUF_BLOCK_ZIP_FREE,
that is, the control block was not freed.
buf_LRU_insert_zip_clean(): New function, for inserting a compressed-only
block into buf_pool->zip_clean in the LRU order.
buf_LRU_block_remove_hashed_page(), buf_LRU_free_block():
Add the flag "zip" for controlling if the compressed page of an uncompressed
page should be removed. For now, assume zip==TRUE.
buf_LRU_get_free_block(): Replace the test for UT_LIST_GET_LEN(buf_pool->free)
with a test for the return value of buf_LRU_get_free_only(). Do not
free zip.data, as it must already have been freed.
buf_flush_insert_into_flush_list(), buf_flush_insert_sorted_into_flush_list():
Remove compressed-only blocks from the buf_pool->zip_clean list.
buf_flush_remove(): Restore compressed-only blocks to
the buf_pool->zip_clean list.
buf_page_init_for_read(): Uncompress compressed-only blocks when possible.
Currently, there cannot be any compressed-only blocks in the buffer pool;
they would be inserted by buf_LRU_free_block(bpage, zip=FALSE).
buf_LRU_get_free_block(): Document that the block is in the state
BUF_BLOCK_READY_FOR_USE.
buf_block_alloc(): Change the state of the block to BUF_BLOCK_MEMORY
and document it.
Replace those invocations of buf_block_alloc() with
buf_LRU_get_free_block() where the allocated block is used for buffer
pool input and output. However, temporary copies of B-tree pages
during reorganization are not used for file I/O, and such blocks are
still allocated with buf_block_alloc().
buf_LRU_free_block(): Free compressed-only pages and their
descriptors with buf_buddy_free().
buf_LRU_get_free_only(): New function for returning a block from
buf_pool->free if one is available. Split from buf_LRU_get_free_block().
buf_buddy_alloc_zip(): Rename from buf_buddy_alloc_low() and make static.
Remove parameter "split". Always try to split.
buf_buddy_free_block(): Rename to buf_buddy_block_free().
buf_buddy_block_register(): New function for registering buf_block_t
objects reserved by the allocator.
buf_buddy_alloc_from(): New function for allocating an object from a
bigger object, and putting the unused parts on the free list.
buf_buddy_alloc_clean_zip(): New function for allocating memory by
replacing an unmodified compressed page.
buf_buddy_alloc_low(): New function for allocating memory, either from
the free lists of compressed pages, from the global free list, or from
unmodified pages in the buffer pool.
Introduce FIL_PAGE_ZBLOB_DATA as a synonym for FIL_PAGE_FILE_FLUSH_LSN.
btr_store_big_rec_extern_fields(): Make the assertion about
dict_table_zip_size() more accurate.
buf_LRU_get_free_block(), buf_block_alloc(): Add parameter zip_size.
buf_calc_zblob_page_checksum(): Remove. Replace with page_zip_calc_checksum().
buf_page_init(): Remove parameter zip_size.
buf_page_io_complete(): Add a placeholder for handling compressed pages.
trx_doublewrite_page_inside(): Remove redundant function.
page_zip_write_rec(): Relax an overly tight assertion about blob_no.
