diff options
Diffstat (limited to 'mysys/my_alloc.c')
| -rw-r--r-- | mysys/my_alloc.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/mysys/my_alloc.c b/mysys/my_alloc.c index f494cce8dbe..1ab86476e41 100644 --- a/mysys/my_alloc.c +++ b/mysys/my_alloc.c @@ -29,7 +29,7 @@ void init_alloc_root(MEM_ROOT *mem_root, uint block_size, mem_root->min_malloc= 32; mem_root->block_size= block_size-MALLOC_OVERHEAD-sizeof(USED_MEM)-8; mem_root->error_handler= 0; - mem_root->block_num= 0; + mem_root->block_num= 4; /* We shift this with >>2 */ mem_root->first_block_usage= 0; #if !(defined(HAVE_purify) && defined(EXTRA_DEBUG)) if (pre_alloc_size) @@ -69,10 +69,11 @@ gptr alloc_root(MEM_ROOT *mem_root,unsigned int Size) reg2 USED_MEM **prev; Size= ALIGN_SIZE(Size); - if ( (*(prev= &mem_root->free)) != NULL ) + if ((*(prev= &mem_root->free)) != NULL) { - if( (*prev)->left < Size && - mem_root->first_block_usage++ >= MAX_BLOCK_USAGE_BEFORE_DROP ) + if ((*prev)->left < Size && + mem_root->first_block_usage++ >= ALLOC_MAX_BLOCK_USAGE_BEFORE_DROP && + (*prev)->left < ALLOC_MAX_BLOCK_TO_DROP) { next= *prev; *prev= next->next; /* Remove block from list */ @@ -85,7 +86,7 @@ gptr alloc_root(MEM_ROOT *mem_root,unsigned int Size) } if (! next) { /* Time to alloc new block */ - block_size= mem_root->block_size*((mem_root->block_num>>2)+1); + block_size= mem_root->block_size * (mem_root->block_num >> 2); get_size= Size+ALIGN_SIZE(sizeof(USED_MEM)); get_size= max(get_size, block_size); @@ -177,10 +178,8 @@ void free_root(MEM_ROOT *root, myf MyFlags) root->free=root->pre_alloc; root->free->left=root->pre_alloc->size-ALIGN_SIZE(sizeof(USED_MEM)); root->free->next=0; - root->block_num= 1; } - else - root->block_num= 0; + root->block_num= 4; root->first_block_usage= 0; DBUG_VOID_RETURN; } |