JPH09146830A - Memory management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform a communication control processing in an overload state by designating the overload state level of a memory and an overload request level indicating priority by a user and performing memory management matched with a system form. SOLUTION: A level analysis processing part 31 compares the propriety of a securing request level N specified by a memory securing request by a memory securing function 21 with the two kinds of levels set in an initial setting part 10 and judges it. A state management processing part 32 monitors the memory, obtains the residual amount of a resident area and performs management. In this case, a value for which the size M of the securing request designated by the memory securing function 21 is subtracted from the size L of the residual memory area of the memory stationary area 40 is defined as the size K of the residual memory area for an operation. A memory secured result judgement processing part 35 judges whether or not the area of the size specified by the securing request level N specified by the memory securing request from the memory securing function 21 can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory management system for managing memory reservation and release in a communication control system, and more particularly to a memory management system for realizing efficient use of memory in an overloaded state.

[0002]

2. Description of the Related Art When communication is performed between computers via a network such as a LAN or WAN, the amount of data to be communicated increases, which may cause a shortage of memory in the computers, resulting in an overloaded state. In such a case, there has been proposed a technique for performing memory management so as to secure a necessary storage area in the memory and release an area storing unnecessary data.

As a conventional technique of this type, there is, for example, the technique disclosed in Japanese Patent Laid-Open No. 4-112249. In this document, a predetermined memory size is stored when a continuous area of memory is secured by using the link format, and the memory size stored at the time of securing is decremented by "1" when releasing the area. A memory management system that secures and releases continuous memory without using a management table, memory relocation, etc. With this technique, it is possible to reduce a wasteful area in using the word memory.

As another conventional technique, for example, there is a technique disclosed in Japanese Unexamined Patent Publication No. 4-97468. The document describes a memory management system that monitors the memory usage at regular intervals and replenishes the memory according to the increase in communication load when the communication load increases rapidly.

By the way, in communication control in an overloaded state, there is a need to maintain a logical connection with a communication partner, or to disconnect an existing logical connection and generate a new logical connection. It may occur. In such a case, it is necessary to determine the priority of connection. However, each of the above-described conventional memory management methods unconditionally secures a finite memory, which may increase the load and may cause a situation in which the control requested by the user cannot be performed.

[0006]

As described above, the conventional memory management technique unconditionally secures a finite memory in the communication control under an overloaded state, which increases the load, and There is a drawback that the requested control may not be possible.

The present invention enables the user to specify the overload state level and the overload request level, realizes memory management according to the system form, and efficiently performs communication control processing in the overload state. It is an object of the present invention to provide a memory management method that enables the above.

[0008]

In order to achieve the above object, the memory management system of the present invention divides a memory area into a plurality of management units, and determines the size of the area and the priority of a request to secure the area. The memory resident area management is performed by comparing the memory reservation request and the two types of levels set by the initial setting means with the initial setting means for performing the initial setting in the management of the memory resident area at the two levels shown. It is configured to include management means for performing.

In another aspect, the user sets two types of levels set by the initial setting means.

Another memory management method that achieves the above object is to divide a memory area into a plurality of management units, and use two levels of memory indicating the size of the area and the priority of the area reservation request. The management unit includes initial setting means for performing initial setting in management of the resident area, memory management function storage means for storing a memory securing function and a memory releasing function used for memory management, and a management section for executing memory management. Is a level analysis processing unit that analyzes the validity of the memory reservation request, a state management processing unit that manages the state of the memory resident area, a memory reservation result judgment processing unit that judges the effectiveness of the memory reservation, and a memory reservation A notification processing unit for notifying the result to the memory management function storage unit is provided.

In still another aspect, the memory allocation result determination processing means determines whether or not an area of a specified size can be allocated at the allocation request level specified by the memory allocation request.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a computer system which realizes a memory reservation method according to an embodiment of the present invention.

As shown in the figure, the memory allocation method of this embodiment stores an initial setting section 10 for initializing memory management in the system, and a memory management function storing memory reservation function and memory release function used for memory management. Part 20
And a management unit 30 that executes memory management. Further, as shown in the figure, the resident area 40 of the memory is divided into J areas of level 1 to level J in order from the smallest area size. That is, level 1 is the smallest remaining memory area. It should be noted that only the characteristic configuration of the present embodiment is shown in the figure, and other configurations are omitted.

The initial setting section 10 manages two types of levels designated by the user in consideration of the system configuration to request memory reservation. The two types of levels specified here are
An allocation request level N (N) designated by the memory allocation function of the memory management function storage unit 20 and any one of level 1 to level J of the memory resident area 40 divided into J pieces and indicating the priority of the memory allocation request. Is an arbitrary natural number) and.
By designating these two types of levels, the size of the area of the memory for which securing is requested and the priority of the request are designated.

The memory management function storage unit 20 stores a memory reservation function 21 used for allocating a memory and a memory release function 22 used for allocating a memory.

The memory reservation function 21 specifies the size of the area to be reserved and the request level as an argument, and makes a memory reservation request to the management unit 30. As the return value from the management unit 30, the head address of the secured area is returned. Further, the memory release function 22 specifies the start address of the area to be released as an argument and makes a memory release request to the management unit 30.

The management unit 30 realizes various processes for memory management, and a level analysis processing unit 31 for analyzing the request level in the memory reservation request and a state management processing unit for managing the state of the memory resident area. 32, and a memory securing access processing unit 33 for securing a memory resident area
The memory release access processing unit 34 for releasing the memory resident area, the memory reservation result judgment processing unit 35 for judging the effectiveness of the memory reservation, and the memory management function storage unit 20 for the memory reservation result. The notification processing unit 36.

The level analysis processing unit 31 judges the validity of the reservation request level N specified by the memory reservation request by the memory reservation function 21 by comparing it with the two types of levels set in the initial setting 10. If the security request level N is determined to be unreasonable, that is, if the security request cannot be accepted with the priority corresponding to the security request level N, the notification processing unit 36 is notified of the security request level N being unreasonable. Notify as If the securement request level N is determined to be valid, that is, if the securement request can be accepted with the priority, the state management processing unit 3
Proceed to processing in 2.

The state management processing unit 32 monitors the memory, obtains the remaining amount of the memory resident area, and manages it. Here, a value obtained by subtracting the size M of the securing request specified by the memory securing function 21 from the size L of the remaining memory region of the memory resident region 40 is the size of the working remaining memory region, that is, the memory resident region The remaining amount is K (= LM).

The memory allocation result determination processing unit 35 determines whether or not the area of the specified size can be allocated at the allocation request level N specified by the memory allocation request from the memory allocation function 21.

The notification processing unit 36 receives the judgment result of the memory reservation result judgment unit 35 or the notification of the illegal request level from the level analysis processing unit 31, and notifies the memory management function storage unit 20 of the result of the memory reservation.

The memory securing access processing unit 33 and the memory releasing access processing unit 34 are used to access the memory resident area 40 at the time of memory securing or memory releasing, respectively.

Hereinafter, referring to the flow chart of FIG.
A process of determining whether or not the memory can be secured by the memory securing result determination processing unit 35 will be described.

First, it is determined which of the levels 1 to J the remaining work memory area K obtained by the state management processing unit 32 corresponds to the overload state set by the initial setting unit 10. (Step 201). The value of the obtained overload state level is j. Here, the overload state level j initially corresponds to the level J, and every time there is no free area in the area of the level, the level J-1, level J-2, ..., Level 2, level It becomes 1.

Next, the reservation request level N designated by the memory reservation function 21 is compared with the overload state level j (step 202). Here, a method of comparing the securing request level N and the overload state level j will be described in detail. First, as the determination correction value G, the lowest securing request level that can be designated by the memory securing function 21 is changed to the overload state level. Set the value obtained by subtracting the lowest rank. Then, the overload state level J and the determination correction value G are subtracted from the securing request level N.
The obtained value is defined as the judgment value A.

When the judgment value A is 0 or less, the work remaining memory area K is set to the remaining memory area L because it can be secured (steps 203 and 204). Then, the memory securing access processing unit 33 notifies the memory resident area 40 of the secured size and secures the required memory area (step 205). The secured result is notified from the notification processing unit 36 to the memory management function storage unit 20 and used for updating the memory securing function 21 (step 206). On the other hand, when the determination value A is 1 or more, the notification processing unit 36 notifies the memory management function storage unit 20 that it cannot secure (steps 203 and 20).
7).

When the memory area is released, first, the start address of the area specified by the memory release function 22 is notified to the memory release access processing section 34 of the management section 30.
Then, the memory release access processing unit 34 obtains the size of the area from the start address of the area to be released, and sets a value obtained by adding the size of the area to be released to the remaining memory area L to the new remaining memory area L. And free the space.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not necessarily limited to the above embodiments.

[0030]

As described above, according to the present invention,
Since the user can specify the memory overload status level and the overload request level indicating the priority, memory management can be performed according to the system configuration, and communication control processing in the overload status can be performed efficiently. There is an effect that can be achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a computer system that implements a memory management system according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the present embodiment.

[Explanation of symbols]

 10 initial setting unit 20 memory management function storage unit 21 memory allocation function 22 memory release function 30 management unit 31 level analysis processing unit 32 state management processing unit 33 memory allocation access processing unit 34 memory release access processing unit 35 memory allocation result judgment Processing unit 36 Notification processing unit 40 Memory resident area

Claims (5)

[Claims] 1. A memory area is divided into a plurality of management units,
Initializing means for performing initial setting in management of the resident area of the memory at two levels indicating the size of the area and the priority of the area securing request, and the memory securing request and 2 set by the initial setting means. A memory management method comprising: a management unit that manages a memory resident area by comparing the levels with types. 2. The memory management system according to claim 1, wherein the user sets two types of levels set by the initial setting means. 3. The memory area is divided into a plurality of management units,
Initialization means for performing initialization in management of the resident area of the memory at two levels indicating the size of the area and the priority of the request to secure the area, and a memory securing function and a memory releasing function used for the memory management are stored. A memory management function storage unit and a management unit that executes memory management are provided, and the management unit includes a level analysis processing unit that analyzes the validity of the memory reservation request and a state management processing unit that manages the state of the memory resident area. A memory management method comprising: a memory reservation result determination processing unit for judging the effectiveness of memory reservation; and a notification processing unit for notifying the memory management function storage unit of the result of memory reservation. 4. The memory allocation result determination processing means, at the allocation request level designated by the memory allocation request,
4. The memory management method according to claim 3, wherein it is determined whether an area having a designated size can be secured. 5. The memory management system according to claim 3, wherein the user sets two types of levels set by the initial setting means.