CN1427342A - Internal storage management system and its distribution method - Google Patents
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Abstract
A memory management system is composed of memory management module interface consisting of a group of functions for the initialization of structure, memory request and memory release, several memory block managing modules as the basic unit for memory management, and each memory block managing unit for preserving the information on each memory block. Its allocation method features that the memory block managing array is combined with memory block lining table, and the pre-allocation and class management are used for eliminating fragments and improving system performance.
Description
(1) technical field
The present invention relates to a kind of internal storage management system and distribution method thereof.
(2) prior art
Usually, the management method of the dynamic use internal memory that operating system provides is the memory management of making according to generalized case, is the application and the release of internal memory, and in general this method can realize with chained list or storehouse.The chain table method is arranged free block with the chain sheet form, if there is the situation of application internal memory to occur, just the head from chained list begins to search for idle memory block, if this memory block is less than the required size of application internal memory, then prolonging chained list and continuing search,, and distributing and use up to the memory block that finds enough sizes; If have the situation of releasing memory to occur, just memory block be put into the afterbody of idle queues.Stacking method is similar with the formation method when the application internal memory, only takes out free memory block from stack top; During release memory block is put into stack top.All there is a common feature in these two kinds of methods, promptly tell the memory block of the required size of application during storage allocation from bigger memory block, and remainder is continued to be kept in the free memory chained list as a free memory block.
In a lot of application scenarios, operating system dynamically uses the frequency of internal memory very high, and the memory size of each application is unfixing again, and needs uninterrupted the execution for a long time.If the EMS memory management process of using this operating system to provide owing to apply for incessantly for a long time and releasing memory, to the end, will inevitably produce a large amount of very little free blocks.If at this moment by certain instrument internal memory situation, it is a lot of to find that total operable amount of ram also has, but will apply for a bigger memory block time, system is but answered does not have enough internal memories.
As Fig. 1, the memory management mode of using operating system to provide, when the application internal memory, at first the head from the free memory chained list begins to seek the enough memory blocks of size, the size of first free memory 1 and second free memory 2 is not enough, and the size of the 3rd free memory 3 surpasses the size of application request memory, so from free memory 3 behind the storage allocation (representing the internal memory of this internal memory application distribution), the remainder of the 3rd free memory 3 is very little memory blocks, becomes memory fragmentation 4.Behind the application system long-play, there is a large amount of memory fragmentation 4 in the internal memory, not only influence application internal memory required time also will finally cause internal memory to exhaust, and not have enough big free memory to be used for bigger Memory Allocation.
The settling mode of common above-mentioned situation is to realize that by certain program the internal memory free block merges, but when this program of execution, the performance of system can descend significantly.And application system is to move always, and therefore the decline of the system performance of bringing is unacceptable.Especially some application system that memory management, system performance are had higher requirements, as: the frequent signaling systems that require dynamically to use internal memory etc., this memory management way obviously can't satisfy system requirements.
(3) summary of the invention
The object of the present invention is to provide a kind of internal storage management system and distribution method thereof, need the frequent application system of dynamically using internal memory to be applicable to, thereby significantly reduce the memory fragmentation of system's generation in service, improve the efficient that internal memory uses, improve the performance of application system, the security when also having improved simultaneously the speed of memory management and internal memory and using.
A kind of internal storage management system provided by the present invention, comprise memory management module interface, several memory block management modules that link to each other with the memory management module interface and several memory block management unit that link to each other with each memory block management module, wherein: the memory management module interface, form by one group of function, finishing initialization, internal memory application, the internal memory release function of structure, is the interface of application access internal memory; The memory block management unit is the elementary cell of memory management, the memory block that each memory block management unit is managed corresponding to a quilt, the relevant information of preserving this memory block; The memory block management module, by linked list maintenance and one group of memory block management unit of management, this pairing memory block size in group memory block management unit is identical.
Above-mentioned internal storage management system, wherein, the handled information of memory block management module comprises: the size of memory block; The total block data of memory block; The piece number of free memory block; The use peak value of memory block; The label of first free block; The label of last free block; The pointer of first internal storage location; The pointer of first memory block management unit; And the signal lamp of memory block.
Above-mentioned internal storage management system, wherein, the handled information in memory block management unit comprises: memory block idle marker position; Next free block label; The actual use of memory block length; Memory block applicant sign; Memory block releaser sign.
A kind of memory allocation method provided by the present invention requires to enter the Memory Allocation process according to the internal memory application, comprises the following steps: 1) according to the memory size of being applied for, the optimal memory block management module of ascending selection; 2) judge whether there is idle memory block in this memory management module: (1) then extracts first free memory block if exist from this memory block management module, its step comprises: a) first free memory block in selected this group; B) this memory block is deleted from idle chained list; C) the free memory block chained list of this memory block management module is operated, and upgraded the information of pairing memory block management unit; D) this block address memory is returned this internal memory application success; (2) if do not exist, judge whether bigger memory block management module: a), then select next memory block management module, and be back to step 2) if exist; B) if do not exist, then this internal memory application failure.
The present invention has adopted above-mentioned technical solution, realize memory management with the memory block management array with the mode that the memory block chained list combines, and the mechanism of employing internal memory predistribution and Classification Management, reaching high real-time and to eliminate the purpose of memory fragmentation, thereby improved the performance of application system widely.The present invention is good replenishing with perfect to existing memory management mechanism.
(4) description of drawings
Fig. 1 is the memory management mode synoptic diagram that existing operating system provides
Fig. 2 is an internal storage management system structural representation of the present invention
Fig. 3 is the memory allocation method process flow diagram
(5) embodiment
As shown in Figure 2, the present invention, promptly a kind of internal storage management system comprises memory management module interface 5, several memory block management modules 6 that link to each other with memory management module interface 5 and several memory block management unit 7 that link to each other with each memory block management module 6.
Memory management module interface 5 is made up of one group of function, finishes initialization, internal memory application, the internal memory release function of structure, is the interface of application access internal memory.
Memory block management unit 7 is elementary cells of memory management, the memory block that each memory block management unit is managed corresponding to a quilt, the relevant information of preserving this memory block.Handled information comprises: memory block idle marker position; Next free block label; The actual use of memory block length; Memory block applicant sign; Memory block releaser sign.
Memory block management module 6, by linked list maintenance and one group of memory block management unit 7 of management, these group memory block management unit 7 pairing memory block sizes are identical.Handled information comprises: the size of memory block; The total block data of memory block; The piece number of free memory block; The use peak value of memory block; The label of first free block; The label of last free block; The pointer of first internal storage location; The pointer of first memory block management unit; And the signal lamp of memory block.
The present invention is applied in the memory management of communication system, suppose two memory block management modules are arranged, respectively management size be 16 byte quantity be 1000 one group of memory block and size be 32 byte quantity be 2000 another organize memory block, the memory block of each 16 byte or 32 bytes is all to there being the memory block management unit of oneself.The memory management module interface is the inlet of the public memory block of management.
Next free block sign in the sign of first free block in the memory block management module, the sign of last free block and the memory block management unit is respectively that two groups of internal memory free blocks of 16 and 32 link with size, becomes chained list.
As shown in Figure 3, memory allocation method of the present invention comprises the following steps:
1) according to the memory size of being applied for, the optimal memory block management module of ascending selection;
2) judge whether there is idle memory block in this memory management module:
(1) if exist, then from this memory block management module, extract first free memory block, its step comprises:
A) first free memory block in selected this group;
B) this memory block is deleted from idle chained list;
C) the free memory block chained list of this memory block management module is operated, and upgraded the information of pairing memory block management unit;
D) this block address memory is returned this internal memory application success;
(2) if do not exist, judge whether bigger memory block management module:
A) if exist, then select next memory block management module, and be back to step 2);
B) if do not exist, then this internal memory application failure.
When the application program internal memory, the internal memory application part in the memory management module interface is at first according to the size of applying for internal memory, the optimal memory block management module of ascending selection.Take out the free memory block administrative unit again in the free memory block administrative unit chained list from this memory block management module, the memory block of this memory block management unit correspondence is the internal memory of this internal memory application distribution.If do not have free memory block in this memory block management module, then apply for bigger memory block successively.If all do not have free memory block in the bigger memory block management module, then application failure.
Claims (4)
1. an internal storage management system comprises memory management module interface, several memory block management modules that link to each other with the memory management module interface and several memory block management unit that link to each other with each memory block management module, wherein:
The memory management module interface is made up of one group of function, finishes initialization, internal memory application, the internal memory release function of structure, is the interface of application access internal memory;
The memory block management unit is the elementary cell of memory management, the memory block that each memory block management unit is managed corresponding to a quilt, the relevant information of preserving this memory block;
The memory block management module, by linked list maintenance and one group of memory block management unit of management, this pairing memory block size in group memory block management unit is identical.
2. internal storage management system according to claim 1 is characterized in that, the handled information of described memory block management module comprises: the size of memory block; The total block data of memory block; The piece number of free memory block; The use peak value of memory block; The label of first free block; The label of last free block; The pointer of first internal storage location; The pointer of first memory block management unit; And the signal lamp of memory block.
3. internal storage management system according to claim 1 is characterized in that, the handled information in described memory block management unit comprises: memory block idle marker position; Next free block label; The actual use of memory block length; Memory block applicant sign; Memory block releaser sign.
4. a memory allocation method requires to enter the Memory Allocation process according to the internal memory application, comprises the following steps:
1) according to the memory size of being applied for, the optimal memory block management module of ascending selection;
2) judge whether there is idle memory block in this memory management module:
(1) if exist, then from this memory block management module, extract first free memory block, its step comprises:
A) first free memory block in selected this group;
B) this memory block is deleted from idle chained list;
C) the free memory block chained list of this memory block management module is operated, and upgraded the information of pairing memory block management unit;
D) this block address memory is returned this internal memory application success;
(2) if do not exist, judge whether bigger memory block management module:
A) if exist, then select next memory block management module, and be back to step 2);
B) if do not exist, then this internal memory application failure.
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| CN1317911C (en) * | 2004-03-03 | 2007-05-23 | 乐金电子(中国)研究开发中心有限公司 | Device and method of managing the mobile terminal dynamic memory |
| CN100359489C (en) * | 2004-07-13 | 2008-01-02 | 中兴通讯股份有限公司 | Method for internal memory allocation in the embedded real-time operation system |
| CN100377104C (en) * | 2005-02-28 | 2008-03-26 | 中国科学院计算技术研究所 | RAM accessing information real-time capturing device and method |
| CN100382048C (en) * | 2005-11-08 | 2008-04-16 | 中兴通讯股份有限公司 | A managing method for EMS memory |
| CN100395712C (en) * | 2005-12-22 | 2008-06-18 | 华为技术有限公司 | Source management method for software system |
| CN100452761C (en) * | 2004-04-27 | 2009-01-14 | 华为技术有限公司 | Method of data packet storage in communication equipment |
| CN100462940C (en) * | 2007-01-30 | 2009-02-18 | 金蝶软件（中国）有限公司 | Method and apparatus for cache data in memory |
| CN100466602C (en) * | 2005-04-28 | 2009-03-04 | 华为技术有限公司 | Method for dynamically sharing space of memory |
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| CN1652616B (en) * | 2004-02-07 | 2010-04-14 | 华为技术有限公司 | Adaptive system managing method |
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