JPS63118852A - Control system for virtual memory - Google Patents

Abstract

PURPOSE:To realize the effective use of a virtual address space and reduction of the program executing time by recognizing presence of a proper variable part and a common invariable part that can be shared by other programs and storing these variable and invariable parts into a proper address space. CONSTITUTION:The virtual memories 21-23 contain proper address spaces 25-27. Then it is recognized that the proper variable parts (a) and (c) and an invariable part (x) that can be shared by other programs are contained in the programs stored in the memories 21-23. These parts (a), (c) and (x) are stored in the spaces 25-27. Thus the parts (a)-(x) are set into the spaces 25 and 27 when programs are loaded to the memories 21-23. Then the space 26 is expended to omit dynamic security and initialization of both parts (a) and (c).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control method for a virtual storage device when there is an unchangeable part shared by a plurality of programs.

[Prior art]

In general, a computer's real (main) storage device has a much shorter access time but a smaller storage capacity; conversely, an external storage device such as an auxiliary storage disk device has a longer access time but a much smaller storage capacity. big. Therefore, programs, data, etc. do not need to exist in their entirety on the real storage device, and only the portion of, for example, one page required for the current execution needs to be on the real storage device. Other pages to be executed later are stored in an external storage device and recalled to the real storage device as needed. A virtual storage device is constructed in which the real address of the real storage device and the virtual address of the external storage device are linked using an address conversion table, and a large-capacity external storage device is incorporated into the real storage device using software and an interface. .

FIG. 4 shows a memory map of a program storage method in a conventional virtual storage device. In the same figure, 1
0, 11.12 is a virtual storage device A provided in parallel,
These virtual storage devices A, B, and C have common address spaces 1, 2.3, and mutually independent unique address spaces 5, 6.7, respectively. Common address space 1.
2. 3 corresponds to the real storage device which is substantially the same, and each intervening address space corresponds to the separately provided external storage device, forming a multiple virtual storage device.

When storing a program consisting of variable part a and constant part X in virtual storage device A, and a program consisting of variable part C and constant part X in virtual storage device C, conventionally, constant part The variable part a is stored in the address space 1, 2.3, the variable part a is stored in the unique address space 5, and the variable part C is stored in the unique address space 7.
I remember each of them. Invariant part X which is such a common part
When loading a program having That is, processing is performed using the address conversion table, consistency with the unchanged part X is achieved, and the program is executed.

[Problem that the invention seeks to solve]

In the conventional control method, the unchanging part X of the program is placed in the shared address space 1.2.3, that is, in the real storage device, so the capacity of the real storage device, which is the main memory, is reduced, and by that amount,
The important task of cueing more tasks is being restricted. Another problem is that it becomes necessary to dynamically secure the variable parts a and c and to initialize them to match them with the constant part X.

This invention was made in view of the above circumstances, and it is possible to improve the efficiency of program execution and the efficiency of the virtual storage device without narrowing the shared address space of the virtual storage device and without requiring dynamic allocation and initialization of moving parts. The purpose of this paper is to provide a control method for virtual storage devices.

[Means for solving problems]

Virtual storage devices 21, 22. ．． 23 is unique address space 2
5, 26.27, and the virtual storage devices 21.22.
In the program stored in 23, unique variable parts a, c
It recognizes that there is a constant part X that can be shared by other programs, and stores both the variable parts a and c and the constant part X in the unique address spaces 25, 26, and 27.

[Effect]

When loading a program into the virtual storage devices 21, 22, and 23, the variable parts a and c and the fixed part Dynamic allocation and initialization of parts a and c are unnecessary.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 shows a memory map of the program storage method in the virtual storage device of the present invention. In the figure, 21, 22, 23 are virtual storage devices provided in parallel, and virtual storage values [21, 22, 23 are a common address space 24 and mutually independent unique address spaces 25, 26, .
27 each. The common address space 24 is substantially the same shared real (main) storage, and each unique address space is a separate external storage. These common address spaces 24 and unique address spaces 25, 2
6.27 are integrated by an arithmetic processing unit (not shown) to construct multiple virtual storage devices 21, 22, and 23, respectively.

The virtual storage devices 21 and 23 each store a program having a common part. A program consisting of a variable part a and an unchanging part X is stored in the virtual space 21, and a program consisting of a variable part C and an unchanging part X is stored in the virtual space 23. Department.

In the virtual storage device 21, the variable part a and the fixed part I remember. Therefore,
Before a program is executed, no program is stored in the common address space 24.

FIG. 2 is a diagram illustrating details of the memory map and data movement in the unique address space 25 or 27 of the virtual storage device 21 or 23.

The variable part a (or a will be simply explained below in C1) 31 of the stored program consists of an initial setting part, an execution control part, and a data part, and the constant part X32 is a common routine A, routine B, etc. Z etc. 1 For example I F-T
Each routine is composed of HAN routines.

The initial setting section is set so that when the program is started, it is first given a program execution control function and is able to access the data section and call each routine A etc. included in the constant section X. It is something.

The execution control section advances the processing of the program while calling each routine A of the unchanged section X.

The data portion contains unique data required when executing the program.

The operation will be explained according to FIG.

In step S1, it is determined whether the program to be executed has a shared part, that is, an unchanged part X. If so, the process proceeds to step S2, and first, only the variable part a is loaded from the unique address space 25 (external storage device) to the common address space 24 (real storage device).

In step $3, it is determined whether the constant portion X already exists on the common address space 24 (real storage device). If it does not exist, it is loaded from the unique address space 24 (external storage device) to the common address space 24 (real storage device) in step S4. If the constant part X already exists in the common address space 24 in another program, the constant part X is set to be shared, and its loading becomes unnecessary, and the process directly proceeds to step S5.

In step S5, the initial setting section of variable section a is executed on the real storage device to perform initial setting. Next, in step S6, a desired routine in the unchanged portion X is called and the execution of the program is advanced.

In step S1, if there is no shared part, proceed to step 37 and step S8, load the program as usual,
And execute.

- In the above embodiment, the constant portion X of the program is shared between a plurality of virtual storage devices, but the constant portion X may be shared between different programs within the same virtual storage device.

〔Effect of the invention〕

As described above, according to the present invention, variable parts can be dynamically allocated without narrowing the common address space.

Since the processing of the address conversion table is also unnecessary, the remaining capacity of the real storage device can be allocated to processing other tasks, making it possible to effectively utilize the overall virtual address space and shorten the program execution time.

[Brief explanation of the drawing]

Fig. 1 is a memory map diagram of the virtual storage device control method of the present invention, Fig. 2 is a detailed memory map diagram of Fig. 1, Fig. 3 is a flowchart for explaining the operation, and Fig. 4 is a conventional memory map diagram. be. 21.22.23...Virtual storage device, 24...Common address space, 25, 26.27...Unique address space, a, c...Variable part, X...Unchangeable part. Agent Masuo Oiwa (two idiots) procedural amendment (1 puke Showa 1999, month, day

Claims (1)

[Scope of Claims] A virtual storage device constructed from an arithmetic processing unit, a real storage device, and an auxiliary storage device, wherein the virtual storage device is provided with a unique address space corresponding to the auxiliary storage device, and the virtual storage device has a unique address space corresponding to the auxiliary storage device. Recognizing that a program to be stored has a unique variable part and a common constant part that can be shared by other programs, and storing both the variable part and the constant part in the unique address space. Features a virtual storage device control method.