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branches/zip: Allow the buddy allocator to work for 16-kilobyte pages,

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twice the maximum block size of the buddy system.

buf_page_t: Note that state may change from BUF_BLOCK_READY_FOR_USE
to BUF_BLOCK_MEMORY without buf_page_get_mutex() protection
[only buf_pool->mutex].

buf_buddy_get_slot(): Extend the output to BUF_BUDDY_SIZES.

buf_buddy_alloc(), buf_buddy_free(): Allow sizes up to UNIV_PAGE_SIZE.

buf_buddy_alloc_low(), buf_buddy_free_low(), buf_buddy_alloc_clean():
Allow i==BUF_BUDDY_SIZES.
This commit is contained in:
marko
2006-12-20 15:56:58 +00:00
parent 77417e46f1
commit 9244a3a503
4 changed files with 52 additions and 31 deletions
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12
include/buf0buf.h
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@@ -70,7 +70,7 @@ enum buf_page_state {
BUF_BLOCK_NOT_USED; @see buf_block_state_valid() */
BUF_BLOCK_NOT_USED, /* is in the free list */
BUF_BLOCK_READY_FOR_USE, /* when buf_get_free_block returns
BUF_BLOCK_READY_FOR_USE, /* when buf_LRU_get_free_block returns
a block, it is in this state */
BUF_BLOCK_FILE_PAGE, /* contains a buffered file page */
BUF_BLOCK_MEMORY, /* contains some main memory object */
@@ -912,8 +912,8 @@ for compressed and uncompressed frames */
struct buf_page_struct{
/* None of the following bit-fields must be modified without
holding block->mutex or buf_pool->zip_mutex, since they can be
stored in the same machine word. Some of them are
holding buf_page_get_mutex() [block->mutex or buf_pool->zip_mutex],
since they can be stored in the same machine word. Some of them are
additionally protected by buf_pool->mutex. */
unsigned space:32; /* tablespace id */
@@ -921,7 +921,11 @@ struct buf_page_struct{
unsigned state:3; /* state of the control block
(@see enum buf_page_state); also
protected by buf_pool->mutex */
protected by buf_pool->mutex.
State transitions from
BUF_BLOCK_READY_FOR_USE to
BUF_BLOCK_MEMORY need not be
protected by buf_page_get_mutex(). */
unsigned flush_type:2; /* if this block is currently being
flushed to disk, this tells the
flush_type (@see enum buf_flush) */