JPH047768A - Buffer control system for computer system - Google Patents

Abstract

PURPOSE:To simplify the processing carried out at the software side and to facilitate the production of the software by replacing a buffer control module of the software with a controller (hardware) to control a virtual memory for each block included in a page. CONSTITUTION:Receiving a buffer securing request from a user 10, a buffer control means 3 gives a request to an operating system 2 to secure a virtual memory space having a size designated by the user 10. Then the system 2 refers to a control table to acquire the continuous idle blocks and designates a logical address and the size of the virtual memory space to request the hardware 5 to assign a real memory space. Thus the hardware 5 assigns a real memory 4 for each block. When a buffer release request is received, the system 2 designates a logical address and the hardware 5 releases the real memory space to display an unused state. Thus the processing is simplified at the software side and the production of the software is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is used for memory management of a communication control buffer when a computer system equipped with a virtual memory communicates via a communication line. The present invention relates to a buffer management method for a computer system that provides a user with a plurality of buffers in pages that are not stored contiguously in real memory as contiguous space in virtual memory.

〔overview〕

In a buffer management method for a computer system equipped with virtual memory, the present invention uses hardware to manage virtual memory in block units within a page (a variable unit within a page), which was previously performed by a software buffer management module. This simplifies the processing on the software side, making it easier to create software.

[Conventional technology]

Traditionally, Hanwha resources in this type of computer system have been managed by dividing a page into multiple fixed-length bars and couches in order to efficiently use buffer resources on virtual memory. The management light chains the requested number of free buffers and provides them to the user as buffer resources, and when the buffers in a page are used in multiple communication paths, the number of buffers secured is not constant, and Since there is no order in the allocation trigger and the release trigger between communication paths, a plurality of free buffers at a certain point in time do not necessarily exist in a continuous space on the virtual memory. Therefore, when transmitted and received messages span multiple buffers, there is no guarantee that the transmitted and received messages will be stored in a continuous space on the virtual memory.

[Problem that the invention seeks to solve]

In the conventional buffer resource management method described above, in order to use real memory efficiently, a virtual memory page is divided into multiple buffers and provided to the user, and the user's sending and receiving messages are the size of one buffer. In cases where the size of the buffer is larger, the buffer management light chains multiple buffers and provides them to the user.

When a user uses multiple buffers to store transmitted and received messages, the chained buffers are not necessarily contiguous spaces in virtual memory. Segments in buffer units that take into account the chained state of buffers when disassembling (hereinafter abbreviated as segments) and assembling chained received messages from discontinuous buffer spaces into continuous virtual memory space (hereinafter abbreviated as assembling). Since control and assembly control are required, segment processing and assembly processing are complicated.

The present invention aims to eliminate such drawbacks and to provide a method that can simplify processing on the software side and facilitate the creation of software.

[Means for solving problems]

The present invention includes a communication control means for communicating with a partner device via a communication line, and a buffer memory used by this communication control means, and this buffer memory is a virtual memory, and this virtual memory is allocated to real memory. In a buffer management method for a computer system including a control device, the control device includes means for allocating a variable length area to consecutive addresses on the virtual buffer memory in units of blocks on the real memory. Features.

[Effect]

When a buffer allocation request is received from a user, the buffer management means requests the operating system to allocate a virtual memory space of the size specified by the user, and the operating system refers to the management table and allocates consecutive free blocks. It requests the hardware to allocate real memory space by specifying the logical address and virtual space size, and the hardware allocates real memory in blocks.

When a buffer release request is received, the operating system specifies a logical address, and the hardware releases the real memory space and displays it as unused.

This makes it possible to simplify buffer management on the software side and segment and assemble processing using the buffers, making it easier to create software.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention.

The embodiment of the present invention includes a communication control means 1 that communicates with a partner device via a communication line, and a buffer memory (not shown) used by this communication control means 1, and this buffer memory is a virtual memory and a real memory. 4 is provided with a control device 5 for allocating this virtual memory, and this control device 5 includes means for allocating a variable length area to consecutive addresses on the virtual buffer memory in units of blocks on the real memory 4. .

FIG. 2 is a diagram showing the relationship between the contents of the message storage area of the memory user and the message contents in the buffer in the embodiment of the present invention;
FIG. 3 is a diagram showing the configuration of logical addresses in the embodiment of the present invention;
FIG. 4 is a diagram showing the relationship between the management table for manipulating virtual memory and real memory in the embodiment of the present invention, and FIG. 5 is a control device that is aware of memory boundaries when accessing the buffer area in the embodiment of the present invention. 5 is a flowchart showing the flow of control in step 5.

As shown in Figure 2, data A in the user message area on the virtual memory is stored in six buffer areas as data A1 to A6, and headers H1 to H6 for communication control are added to the beginning of each buffer. be done. Further, data A in the user message area is stored in a continuous space on the real memory 4, but data A1 to A6 in the buffer area are not stored in a continuous space on the real memory 4.

As shown in Figure 3, the logical address of virtual memory is the segment number! , page number m1, block number n1, and intra-block relative position d. In Fig. 4, ■ indicates a segment management table, ■ indicates a page management table, ■ indicates a block management table, and real memory ■ indicates a page management table.
The correspondence relationship between the space above and the data stored in the space above the virtual memory ■ is shown.

Next, buffer reservation and buffer release will be described with reference to FIGS. 1 and 2, among the virtual methods of buffer management in communication control according to the embodiment of the present invention.

When the user 10 requests the buffer management means 3 to secure a buffer, the buffer management means 3 requests the operating system 2 to secure a virtual memory space of the size specified by the user 1. The logical address returned from the operating system 2 is returned to the user 10 as a buffer address. Buffer management means 3
The side does not directly allocate virtual memory space.

After obtaining consecutive free blocks from the page management table and block management table, the operating system 2 requests the control device 5 to allocate a space in the real memory 4 by specifying the logical address and the size of the virtual space. Upon completion, the logical address at the beginning of the virtual memory space is returned to the buffer management means 3. At this time, the control device 5 side allocates real memory in block units and sets the real address and in-use indication in the block management table.

When the user 10 requests a buffer release request,
The buffer management means 3 specifies a logical address and requests the operating system 2 to return the virtual memory space. The operating system 2 requests the control device 5 to release the real memory space by specifying a logical address. Control device 5
releases the space in the real memory 4 based on the block management table and sets an unused indication in the block management table.

The flow of access control of the real memory 4 by the control device 5 during instruction execution is as shown in FIG. This adds memory access control to obtain the address of.

[Effects of the Invention] As explained above, according to the present invention, the control device (hardware) manages virtual memory in blocks of blocks within a page, which was conventionally performed by a software buffer management module, so that software side The processing (buffer management processing, segmentation using buffers, and assembly processing) can be simplified, and furthermore, the simplification of processing has the effect of making it easier to create software.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention. FIG. 2 is a diagram showing the relationship between the messages sent and received by the user and the messages on the buffer according to the embodiment of the present invention. FIG. 3 is a diagram showing the configuration of logical addresses of virtual memory according to the embodiment of the present invention. FIG. 4 is a diagram showing a conversion table between logical addresses on virtual memory and real addresses on real memory according to the embodiment of the present invention. FIG. 5 is a diagram showing the operation of hardware when executing an instruction to access a buffer according to an embodiment of the present invention. ■... Communication control means, 2... Operating system, 3... Buffer management means, 4. Real memory, 5.
...Control device, 1o...User. Part ■ Illustration 1 Logical Dress Sacrifice Group Number 1 Guest Flag Example Fun Ridding Dress Hit 7 Dresses

Claims (1)

[Claims] 1. A communication control means for communicating with a partner device via a communication line, and a buffer memory used by the communication control means, the buffer memory being a virtual memory, and the virtual memory being stored in the real memory. In a buffer management method for a computer system including a control device that allocates memory, the control device allocates a variable length area to consecutive addresses on the virtual buffer memory in units of blocks on the real memory. A buffer management method for a computer system comprising: