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Merge mysql-5.1 to mysql-5.5.

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This commit is contained in:
Marko Mäkelä 2013-08-21 08:48:04 +03:00
commit c6177ded7e
1 changed files with 17 additions and 29 deletions
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46
storage/innobase/buf/buf0buf.c
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@ -2290,7 +2290,6 @@ loop:
buf_pool, space, offset, fold);
}
loop2:
if (block && buf_pool_watch_is_sentinel(buf_pool, &block->page)) {
block = NULL;
}
@ -2407,6 +2406,11 @@ wait_until_unfixed:
goto loop;
}
/* Buffer-fix the block so that it cannot be evicted
or relocated while we are attempting to allocate an
uncompressed page. */
bpage->buf_fix_count++;
/* Allocate an uncompressed page. */
buf_pool_mutex_exit(buf_pool);
mutex_exit(&buf_pool->zip_mutex);
@ -2416,34 +2420,20 @@ wait_until_unfixed:
buf_pool_mutex_enter(buf_pool);
mutex_enter(&block->mutex);
mutex_enter(&buf_pool->zip_mutex);
/* Buffer-fixing prevents the page_hash from changing. */
ut_ad(bpage == buf_page_hash_get_low(buf_pool,
space, offset, fold));
{
buf_page_t* hash_bpage;
if (--bpage->buf_fix_count
|| buf_page_get_io_fix(bpage) != BUF_IO_NONE) {
hash_bpage = buf_page_hash_get_low(
buf_pool, space, offset, fold);
if (UNIV_UNLIKELY(bpage != hash_bpage)) {
/* The buf_pool->page_hash was modified
while buf_pool->mutex was released.
Free the block that was allocated. */
buf_LRU_block_free_non_file_page(block);
mutex_exit(&block->mutex);
block = (buf_block_t*) hash_bpage;
goto loop2;
}
}
if (UNIV_UNLIKELY
(bpage->buf_fix_count
|| buf_page_get_io_fix(bpage) != BUF_IO_NONE)) {
/* The block was buffer-fixed or I/O-fixed
while buf_pool->mutex was not held by this thread.
Free the block that was allocated and try again.
This should be extremely unlikely. */
mutex_exit(&buf_pool->zip_mutex);
/* The block was buffer-fixed or I/O-fixed while
buf_pool->mutex was not held by this thread.
Free the block that was allocated and retry.
This should be extremely unlikely, for example,
if buf_page_get_zip() was invoked. */
buf_LRU_block_free_non_file_page(block);
mutex_exit(&block->mutex);
@ -2454,8 +2444,6 @@ wait_until_unfixed:
/* Move the compressed page from bpage to block,
and uncompress it. */
mutex_enter(&buf_pool->zip_mutex);
buf_relocate(bpage, &block->page);
buf_block_init_low(block);
block->lock_hash_val = lock_rec_hash(space, offset);