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.

popular demand.

to the buddy system for allocating compressed pages and their descriptors.

buf_buddy_free_block(): New function: Deallocate the buffer frame.

buf_buddy_free(), buf_buddy_free_low(): Return void instead of a pointer
to a freed buffer frame.

clean compressed pages (BUF_BLOCK_ZIP_PAGE).

introduced ib_longlong and %ll length specifier are not C89.)

row_ext_t: Change char* buf to byte* buf to avoid signedness warnings.

Change the type of all bit fields to unsigned.

rec_get_next_ptr(): Add (byte*) casts to avoid arithmetics on void*.

page_zip_decompress_clust(): Do not mix declarations and code.

free block in order to create two adjacent free blocks that can be
recombined.  Add some debug assertions.

buf_buddy_relocate(): New function: Try to relocate a free block.

buf_buddy_alloc_free_low() to buf_buddy_alloc_low().

Add parameter "split" for enabling splits.

compressed pages from the buffer pool.

Makefile.am: Add buf0buddy.h, buf0buddy.ic.

buf/Makefile.am: Add buf0buddy.c.

Introduce the constants BUF_BUDDY_LOW and BUF_BUDDY_SIZES.

buf_pool_t: Add zip_mutex and the lists zip_clean and zip_free[].

buf_page_get_mutex(): Return &buf_pool->zip_mutex instead of NULL.

buf_buddy_get_offset(), buf_buddy_get(), buf_buddy_get_slot(),
buf_buddy_alloc_free(), buf_buddy_alloc_free_low(): New functions.

and document the possible list memberships.

buf_LRU_block_remove_hashed_page() changes the state of the block.
This error was introduced in r1090.

to free_or_flush_list.  The list node pointers can be shared, because a
block can never be belong to both lists at the same time.

as the field will be read without mutex protection in buf_page_io_complete().

(state == BUF_BLOCK_ZIP_PAGE).  Make use of buf_page_in_file()
and buf_page_get_mutex().

buf_block_get_newest_modification(): Rename to
buf_page_get_newest_modification().

Add m_nonempty for facilitating the test in page_zip_alloc().  This
reduces the combined size of the bit-fields to 32 bits.  Thus,
sizeof(page_zip_des_t) == 2 machine words on 32-bit and wider systems.

LRU_position and possibly freed_page_clock.  All these fields are
protected by buf_pool->mutex rather than buf_page_get_mutex().

buf_page_set_accessed(): Add a mutex_own() assertion.

on a NULL pointer.  This error was introduced in r1082.

of the buffer pool from buf_block_t to buf_page_t.  Replace some buf_block_t*
parameters with buf_page_t*.  Add accessor functions.

decompression from page_zip_des_t to buf_page_t, because the fields
needed in compression are modified without holding the block mutex.
All writes to bit-fields sharing a machine word must be protected
by the same mutex or rw-lock.

buf_block_buf_fix_inc_func() to eliminate an #ifdef in every invocation.

to ut_uint64_align_down() and ut_uint64_align_up(), to reflect the rename
of ib_ulonglong to ib_uint64_t in r1085.

64 bits.  "long long" might be longer than 64 bits on some systems.

buf_block_t.  Move the fields "hash" and "file_page_was_freed" from
buf_block_t to buf_page_t.

buf_page_in_file(): New function, for checking block state in assertions.

was broken in r1066.

of the fields "freed_page_clock" and "old".

buf_page_t and page_zip_des_t.

storage size from 16 to 3 bits.

page_zip_get_size(), page_zip_set_size(): New functions.

Replace direct references to page_zip_des_t:size with calls to
buf_block_get_zip_size(), page_zip_get_size(), and page_zip_set_size().

for log sequence numbers, to replace dulint.

buf_block_get_state().

buf_block_init(), buf_page_init_for_backup_restore(): Assign
block->page.zip.state after invoking page_zip_des_init(&block->page).

introduced in r1057 are of the int type.

which should have been replaced in r1057.

threshold.

and uncompressed buffer pool pages.

buf_block_t: Replace page_zip, space, and offset with buf_page_t page.
Replace some integers with bit-fields.

enum buf_block_state: Rename to buf_page_state.  Add BUF_BLOCK_ZIP_PAGE.

page_zip_des_t: Add the field "state".  Make the integer fields bit-fields.

page_zip_copy(): Document which fields are copied.

buf_block_state_valid(): New macro for replacing the magic_n check