diff options
Diffstat (limited to 'storage/innodb_plugin/buf/buf0lru.c')
| -rw-r--r-- | storage/innodb_plugin/buf/buf0lru.c | 214 |
1 files changed, 68 insertions, 146 deletions
diff --git a/storage/innodb_plugin/buf/buf0lru.c b/storage/innodb_plugin/buf/buf0lru.c index a69b2658c51..5124787eba1 100644 --- a/storage/innodb_plugin/buf/buf0lru.c +++ b/storage/innodb_plugin/buf/buf0lru.c @@ -1,6 +1,6 @@ /***************************************************************************** -Copyright (c) 1995, 2010, Innobase Oy. All Rights Reserved. +Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software @@ -272,7 +272,7 @@ next_page: mutex_enter(&((buf_block_t*) bpage)->mutex); is_fixed = bpage->buf_fix_count > 0 - || !((buf_block_t*) bpage)->is_hashed; + || !((buf_block_t*) bpage)->index; mutex_exit(&((buf_block_t*) bpage)->mutex); if (is_fixed) { @@ -355,7 +355,7 @@ scan_again: while (bpage != NULL) { buf_page_t* prev_bpage; - ibool prev_bpage_buf_fix = FALSE; + mutex_t* block_mutex = NULL; ut_a(buf_page_in_file(bpage)); @@ -368,18 +368,21 @@ scan_again: if (buf_page_get_space(bpage) != id) { /* Skip this block, as it does not belong to the space that is being invalidated. */ + goto next_page; } else if (buf_page_get_io_fix(bpage) != BUF_IO_NONE) { /* We cannot remove this page during this scan yet; maybe the system is currently reading it in, or flushing the modifications to the file */ all_freed = FALSE; + goto next_page; } else { - mutex_t* block_mutex = buf_page_get_mutex(bpage); + block_mutex = buf_page_get_mutex(bpage); mutex_enter(block_mutex); if (bpage->buf_fix_count > 0) { + mutex_exit(block_mutex); /* We cannot remove this page during this scan yet; maybe the system is currently reading it in, or flushing @@ -389,106 +392,59 @@ scan_again: goto next_page; } + } + + ut_ad(mutex_own(block_mutex)); #ifdef UNIV_DEBUG - if (buf_debug_prints) { - fprintf(stderr, - "Dropping space %lu page %lu\n", - (ulong) buf_page_get_space(bpage), - (ulong) buf_page_get_page_no(bpage)); - } + if (buf_debug_prints) { + fprintf(stderr, + "Dropping space %lu page %lu\n", + (ulong) buf_page_get_space(bpage), + (ulong) buf_page_get_page_no(bpage)); + } #endif - if (buf_page_get_state(bpage) != BUF_BLOCK_FILE_PAGE) { - /* This is a compressed-only block - descriptor. Ensure that prev_bpage - cannot be relocated when bpage is freed. */ - if (UNIV_LIKELY(prev_bpage != NULL)) { - switch (buf_page_get_state( - prev_bpage)) { - case BUF_BLOCK_FILE_PAGE: - /* Descriptors of uncompressed - blocks will not be relocated, - because we are holding the - buf_pool_mutex. */ - break; - case BUF_BLOCK_ZIP_PAGE: - case BUF_BLOCK_ZIP_DIRTY: - /* Descriptors of compressed- - only blocks can be relocated, - unless they are buffer-fixed. - Because both bpage and - prev_bpage are protected by - buf_pool_zip_mutex, it is - not necessary to acquire - further mutexes. */ - ut_ad(&buf_pool_zip_mutex - == block_mutex); - ut_ad(mutex_own(block_mutex)); - prev_bpage_buf_fix = TRUE; - prev_bpage->buf_fix_count++; - break; - default: - ut_error; - } - } - } else if (((buf_block_t*) bpage)->is_hashed) { - ulint page_no; - ulint zip_size; + if (buf_page_get_state(bpage) != BUF_BLOCK_FILE_PAGE) { + /* This is a compressed-only block + descriptor. Do nothing. */ + } else if (((buf_block_t*) bpage)->index) { + ulint page_no; + ulint zip_size; - buf_pool_mutex_exit(); + buf_pool_mutex_exit(); - zip_size = buf_page_get_zip_size(bpage); - page_no = buf_page_get_page_no(bpage); + zip_size = buf_page_get_zip_size(bpage); + page_no = buf_page_get_page_no(bpage); - mutex_exit(block_mutex); + mutex_exit(block_mutex); - /* Note that the following call will acquire - an S-latch on the page */ + /* Note that the following call will acquire + and release an X-latch on the page. */ - btr_search_drop_page_hash_when_freed( - id, zip_size, page_no); - goto scan_again; - } - - if (bpage->oldest_modification != 0) { + btr_search_drop_page_hash_when_freed( + id, zip_size, page_no); + goto scan_again; + } - buf_flush_remove(bpage); - } + if (bpage->oldest_modification != 0) { - /* Remove from the LRU list. */ + buf_flush_remove(bpage); + } - if (buf_LRU_block_remove_hashed_page(bpage, TRUE) - != BUF_BLOCK_ZIP_FREE) { - buf_LRU_block_free_hashed_page((buf_block_t*) - bpage); - } else { - /* The block_mutex should have been - released by buf_LRU_block_remove_hashed_page() - when it returns BUF_BLOCK_ZIP_FREE. */ - ut_ad(block_mutex == &buf_pool_zip_mutex); - ut_ad(!mutex_own(block_mutex)); - - if (prev_bpage_buf_fix) { - /* We temporarily buffer-fixed - prev_bpage, so that - buf_buddy_free() could not - relocate it, in case it was a - compressed-only block - descriptor. */ - - mutex_enter(block_mutex); - ut_ad(prev_bpage->buf_fix_count > 0); - prev_bpage->buf_fix_count--; - mutex_exit(block_mutex); - } + /* Remove from the LRU list. */ - goto next_page_no_mutex; - } -next_page: + if (buf_LRU_block_remove_hashed_page(bpage, TRUE) + != BUF_BLOCK_ZIP_FREE) { + buf_LRU_block_free_hashed_page((buf_block_t*) bpage); mutex_exit(block_mutex); + } else { + /* The block_mutex should have been released + by buf_LRU_block_remove_hashed_page() when it + returns BUF_BLOCK_ZIP_FREE. */ + ut_ad(block_mutex == &buf_pool_zip_mutex); + ut_ad(!mutex_own(block_mutex)); } - -next_page_no_mutex: +next_page: bpage = prev_bpage; } @@ -501,6 +457,7 @@ next_page_no_mutex: } } +#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG /********************************************************************//** Insert a compressed block into buf_pool->zip_clean in the LRU order. */ UNIV_INTERN @@ -532,6 +489,7 @@ buf_LRU_insert_zip_clean( UT_LIST_ADD_FIRST(list, buf_pool->zip_clean, bpage); } } +#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */ /******************************************************************//** Try to free an uncompressed page of a compressed block from the unzip @@ -572,7 +530,7 @@ buf_LRU_free_from_unzip_LRU_list( UNIV_LIKELY(block != NULL) && UNIV_LIKELY(distance > 0); block = UT_LIST_GET_PREV(unzip_LRU, block), distance--) { - enum buf_lru_free_block_status freed; + ibool freed; ut_ad(buf_block_get_state(block) == BUF_BLOCK_FILE_PAGE); ut_ad(block->in_unzip_LRU_list); @@ -582,24 +540,9 @@ buf_LRU_free_from_unzip_LRU_list( freed = buf_LRU_free_block(&block->page, FALSE); mutex_exit(&block->mutex); - switch (freed) { - case BUF_LRU_FREED: + if (freed) { return(TRUE); - - case BUF_LRU_CANNOT_RELOCATE: - /* If we failed to relocate, try - regular LRU eviction. */ - return(FALSE); - - case BUF_LRU_NOT_FREED: - /* The block was buffer-fixed or I/O-fixed. - Keep looking. */ - continue; } - - /* inappropriate return value from - buf_LRU_free_block() */ - ut_error; } return(FALSE); @@ -630,10 +573,9 @@ buf_LRU_free_from_common_LRU_list( UNIV_LIKELY(bpage != NULL) && UNIV_LIKELY(distance > 0); bpage = UT_LIST_GET_PREV(LRU, bpage), distance--) { - enum buf_lru_free_block_status freed; - unsigned accessed; - mutex_t* block_mutex - = buf_page_get_mutex(bpage); + ibool freed; + unsigned accessed; + mutex_t* block_mutex = buf_page_get_mutex(bpage); ut_ad(buf_page_in_file(bpage)); ut_ad(bpage->in_LRU_list); @@ -643,8 +585,7 @@ buf_LRU_free_from_common_LRU_list( freed = buf_LRU_free_block(bpage, TRUE); mutex_exit(block_mutex); - switch (freed) { - case BUF_LRU_FREED: + if (freed) { /* Keep track of pages that are evicted without ever being accessed. This gives us a measure of the effectiveness of readahead */ @@ -652,21 +593,7 @@ buf_LRU_free_from_common_LRU_list( ++buf_pool->stat.n_ra_pages_evicted; } return(TRUE); - - case BUF_LRU_NOT_FREED: - /* The block was dirty, buffer-fixed, or I/O-fixed. - Keep looking. */ - continue; - - case BUF_LRU_CANNOT_RELOCATE: - /* This should never occur, because we - want to discard the compressed page too. */ - break; } - - /* inappropriate return value from - buf_LRU_free_block() */ - ut_error; } return(FALSE); @@ -1348,17 +1275,16 @@ buf_LRU_make_block_old( Try to free a block. If bpage is a descriptor of a compressed-only page, the descriptor object will be freed as well. -NOTE: If this function returns BUF_LRU_FREED, it will temporarily +NOTE: If this function returns TRUE, it will temporarily release buf_pool_mutex. Furthermore, the page frame will no longer be accessible via bpage. The caller must hold buf_pool_mutex and buf_page_get_mutex(bpage) and release these two mutexes after the call. No other buf_page_get_mutex() may be held when calling this function. -@return BUF_LRU_FREED if freed, BUF_LRU_CANNOT_RELOCATE or -BUF_LRU_NOT_FREED otherwise. */ +@return TRUE if freed, FALSE otherwise. */ UNIV_INTERN -enum buf_lru_free_block_status +ibool buf_LRU_free_block( /*===============*/ buf_page_t* bpage, /*!< in: block to be freed */ @@ -1383,7 +1309,7 @@ buf_LRU_free_block( if (!buf_page_can_relocate(bpage)) { /* Do not free buffer-fixed or I/O-fixed blocks. */ - return(BUF_LRU_NOT_FREED); + return(FALSE); } #ifdef UNIV_IBUF_COUNT_DEBUG @@ -1395,7 +1321,7 @@ buf_LRU_free_block( /* Do not completely free dirty blocks. */ if (bpage->oldest_modification) { - return(BUF_LRU_NOT_FREED); + return(FALSE); } } else if (bpage->oldest_modification) { /* Do not completely free dirty blocks. */ @@ -1403,7 +1329,7 @@ buf_LRU_free_block( if (buf_page_get_state(bpage) != BUF_BLOCK_FILE_PAGE) { ut_ad(buf_page_get_state(bpage) == BUF_BLOCK_ZIP_DIRTY); - return(BUF_LRU_NOT_FREED); + return(FALSE); } goto alloc; @@ -1412,14 +1338,8 @@ buf_LRU_free_block( If it cannot be allocated (without freeing a block from the LRU list), refuse to free bpage. */ alloc: - buf_pool_mutex_exit_forbid(); - b = buf_buddy_alloc(sizeof *b, NULL); - buf_pool_mutex_exit_allow(); - - if (UNIV_UNLIKELY(!b)) { - return(BUF_LRU_CANNOT_RELOCATE); - } - + b = buf_page_alloc_descriptor(); + ut_a(b); memcpy(b, bpage, sizeof *b); } @@ -1518,7 +1438,9 @@ alloc: } if (b->state == BUF_BLOCK_ZIP_PAGE) { +#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG buf_LRU_insert_zip_clean(b); +#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */ } else { /* Relocate on buf_pool->flush_list. */ buf_flush_relocate_on_flush_list(bpage, b); @@ -1585,7 +1507,7 @@ alloc: mutex_enter(block_mutex); } - return(BUF_LRU_FREED); + return(TRUE); } /******************************************************************//** @@ -1797,16 +1719,16 @@ buf_LRU_block_remove_hashed_page( ut_a(bpage->zip.data); ut_a(buf_page_get_zip_size(bpage)); +#if defined UNIV_DEBUG || defined UNIV_BUF_DEBUG UT_LIST_REMOVE(list, buf_pool->zip_clean, bpage); +#endif /* UNIV_DEBUG || UNIV_BUF_DEBUG */ mutex_exit(&buf_pool_zip_mutex); buf_pool_mutex_exit_forbid(); buf_buddy_free(bpage->zip.data, page_zip_get_size(&bpage->zip)); - bpage->state = BUF_BLOCK_ZIP_FREE; - buf_buddy_free(bpage, sizeof(*bpage)); buf_pool_mutex_exit_allow(); - UNIV_MEM_UNDESC(bpage); + buf_page_free_descriptor(bpage); return(BUF_BLOCK_ZIP_FREE); case BUF_BLOCK_FILE_PAGE: |