mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 03:52:35 +01:00
9ec19b9b41
The background is that one user had a lot of views and using some complex queries on information schema temporary memory of more than 2G was used. - Added new element 'total_alloc' to MEM_ROOT for easier debugging. - Added MAX_MEMORY_USED to information_schema.processlist. - Added new status variable "Memory_used_initial" that shows how much MariaDB uses at startup. This gives the base value for "Memory_used". - Reuse memory continuously for information schema queries instead of only freeing memory at query end. Other things - Removed some not needed set_notnull() calls for not null columns.
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/*
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Data structures for mysys/my_alloc.c (root memory allocator)
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*/
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#ifndef _my_alloc_h
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#define _my_alloc_h
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#define ALLOC_MAX_BLOCK_TO_DROP 4096
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#define ALLOC_MAX_BLOCK_USAGE_BEFORE_DROP 10
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct st_used_mem
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{ /* struct for once_alloc (block) */
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struct st_used_mem *next; /* Next block in use */
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size_t left; /* memory left in block */
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size_t size; /* size of block */
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} USED_MEM;
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typedef struct st_mem_root
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{
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USED_MEM *free; /* blocks with free memory in it */
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USED_MEM *used; /* blocks almost without free memory */
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USED_MEM *pre_alloc; /* preallocated block */
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/* if block have less memory it will be put in 'used' list */
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size_t min_malloc;
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size_t block_size; /* initial block size */
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size_t total_alloc;
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unsigned int block_num; /* allocated blocks counter */
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/*
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first free block in queue test counter (if it exceed
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MAX_BLOCK_USAGE_BEFORE_DROP block will be dropped in 'used' list)
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*/
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unsigned int first_block_usage;
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void (*error_handler)(void);
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} MEM_ROOT;
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#ifdef __cplusplus
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}
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#endif
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#endif
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