JPH01216446A - Real storage fixing processing system - Google Patents

Abstract

PURPOSE:To perform a real storage fixing processing operated at high speed by provid ing real storage fixing mode display settable by each program in a processor, and identifying the feasibility/infeasibility of the cancellation of allocation of a real storage area by the real storage fixing mode display. CONSTITUTION:The real storage fixing mode display 21 can be set by a program executed in the processor 2, and it is displayed whether or not a mode is the real storage fixing mode. A real storage managing part 20 tests the real storage fixing mode display 21 in case of requiring the cancellation of the allocation state of a real storage area 4 allocated in a virtual storage area 3, and performs no allocation cancellation processing when the mode is set at the real storage fixing mode, and executes the allocation cancellation processing when another necessary condition is satisfied only when the mode is set at the one other than the real storage fixing mode. In such a way, in the program in which it is enough to perform the processing by prohibiting allocation cancellation for the area where real storage is already allocat ed, it is enough to set the real storage fixing mode display 21, and since it is not required to request and execute the fixing and the cancellation of the fixing of individ ual area to be used to the real storage managing part 20, a processing time can be reduced.

Description

[Detailed Description of the Invention] [Summary] Regarding a processing method for fixing the allocation state for a required period in a virtual memory computer that allocates a real storage area to a virtual storage area, a faster real memory fixation processing method is proposed. It has a real memory management unit that manages the allocation and release of real storage areas on main memory to required virtual storage areas, and accesses the virtual storage areas to which the real storage areas are allocated. In a computer that executes a program, a real memory fixed mode display that can be set to a predetermined state by the program is provided, and the real memory management unit displays the allocation state of the real memory area allocated to the virtual storage area. The configuration is such that whether or not the process to be canceled can be executed is determined based on the setting state of the real storage fixed mode display.

[Industrial application field]

The present invention relates to a processing method for fixing an allocation state unchanged for a required period in a virtual storage computer that allocates a real storage area to a virtual storage area.

[Conventional technology]

FIG. 3 is a block diagram showing an example of the configuration of a computer. In a computer using a so-called virtual memory system, programs and data in, for example, the entire area of the virtual memory space are stored in the external storage device 1, and the required amount in the virtual space 3 is Divide and allocate the real storage area 4 on the main memory of the processing device 2 to the virtual storage area of
By loading that part of the program or data from the external storage device 1 into the real storage area 4, it becomes possible for the processing device 2 to actually access the virtual storage area.

Each real storage area 4 is a storage area in which the main memory is divided into, for example, pages of a certain size, and the real storage management unit 5 manages these real storage areas and allocates them to virtual storage areas as is well known. For the real storage area, an address conversion means called a page table or the like indicating the correspondence between virtual addresses and real addresses is set.

When a program that is loaded into the real storage area 4 and executed tries to access a virtual storage area, and a state is detected that the area is not loaded into the real storage area (this is called a page fault state), an interrupt occurs. The real storage management unit 5 is notified by means such as the following.

The real storage management unit 5 determines an unallocated real storage area, allocates it to the virtual storage area of the access request, loads the information of that part from the external storage device 1, and makes it accessible as described above. do.

In that case, if all the real storage areas have been allocated, select a real storage area that meets the predetermined conditions from among the allocated areas using known appropriate logic and allocate it to the virtual storage area. After performing processing to release the data, the data is allocated to the virtual storage area for which access is requested as described above.

The execution of the program that encounters the page fault is suspended at least until it can be accessed as described above, so the program saves the control information necessary to resume execution and waits for it to become executable. become.

As is well known, in order to execute services provided by an operating system, there are various programs called kernel primitive routines that service the lowest layer control, which are called in response to a predetermined request from an application program. .

The programs for each service in this kernel primitive routine perform processing that completes in a relatively short time, so all necessary virtual storage areas are allocated real storage areas, and execution is not interrupted by page faults. Assuming that this does not occur, the processing speed is increased by configuring a configuration that does not take into account the saving of restart control information or interference by other programs executed during suspension.

To this end, each program 6 of the kernel primitive routine, as shown in the flow of processing in FIG. is specified to request real memory fixation, and the real memory management unit 5 executes real memory fixation processing in processing step 11.

The real storage fixing process is a process that checks whether real storage areas have been allocated to the specified virtual storage areas, allocates real storage areas to all of them, makes them accessible, and fixes each allocated real storage area. be. The real memory management unit 5 needs to perform this process for each real memory management unit.

A fixed state is a state that indicates that deallocation of a real storage area that has been set in that state is prohibited, and a request to unallocate a real storage area that has been set to a fixed state in real storage management information is not accepted. The real storage management unit 5 guarantees that the allocation state will be maintained until the actual memory is allocated.

After the fixing process is finished in the real memory management unit 5, a kernel primitive routine process is executed in a process step 12,
When the process of accessing the fixed area is completed, in process step 13 the real memory management unit 5 is requested to release the real memory fixation, and in process step 14 the specified area is unfixed.

[Problem to be solved by the invention]

As mentioned above, in order to prevent page faults from occurring, the kernel primitive routine requests the real memory management unit 5 to fix the real memory at the beginning of execution, and performs the fixing process, but in reality, in most cases, the virtual memory area is For example, a real storage area has already been allocated to the area of the service requester.

If all the necessary areas have been allocated in this way, a request is made to the real memory management unit 5 to transfer control as described above, and the real memory management unit 5 individually fixes and fixes each area. Performing cancellation processing is redundant processing, and it is desirable to eliminate such overhead.

The object of the present invention is to provide a real memory fixed processing method that reduces such overhead and increases speed.

[Means to solve the problem]

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

This is a system in which programs and data in the virtual storage space held in the external storage device 1 shown in the figure are loaded into the real storage area 4 of the processing device 2 and executed, and the real storage fixed mode display 2I allows each program to be set in the processing device 2. and real memory management section 2.
In the process of allocating a real storage area to a virtual storage area, 0 identifies whether the real storage area can be released or not by the real storage fixed mode display 21.

[For production]

The real storage management unit 20 executed by the processing device 2 manages the allocation and release of real storage areas on the main memory to required virtual storage areas.

The real memory fixed mode display 21 provided in the processing device 2 can be set by a program executed in the processing bag W2, and serves to display whether or not the real memory fixed mode is set.

When the real storage management unit 20 needs to release the allocation status of the real storage area allocated to the virtual storage area, it tests the real storage fixed mode display 21 and cancels the allocation if the real storage fixed mode is set. Only when the release process is not executed and the real storage fixed mode is not executed, the release process is executed if other required conditions are satisfied.

By using the above processing method, in a program that can be processed by prohibiting the deallocation of areas to which real memory has been allocated, it is only necessary to set the real memory fixed mode display 21, and it is sufficient to set the real memory fixed mode display 21. Since it is no longer necessary to request the real storage management unit 20 to fix and unfix the data, processing time is reduced.

〔Example〕

In FIG. 1, the parts indicated by the same reference numerals as in FIG. In the same manner as above, management is executed to allocate and release the real storage area on the main memory to the required virtual storage area. Note that even when the real storage fixing function according to the present invention is provided, the function of setting and fixing the fixing state for each real storage area, as in the conventional case described above, is required for use as described later and for other cases. is necessary.

In the kernel primitive routine of the above example, the processing part related to real memory fixation is changed according to the present invention, and the program 22 first changes the real memory provided in the processing device 2 in processing step 30, as shown in the processing flow of FIG. 2, for example. The memory fixation mode display 21 is set to the real memory fixation mode.

The real memory fixed mode display 21 is set by a required program and provided in a storage area of the main memory of the processing device 2 so that it can be read by the real memory management unit 20, and displays the real memory fixed mode when in an on state, for example. Display non-fixed mode in off state. If necessary, use the real memory fixed mode display 21 as a counter, for example, set the non-fixed mode to 0°, and set the count value ゛1゛ or more to the real memory fixed mode, and set the actual memory fixed mode display 21 to 0° each time the mode is set/cancelled. It is also possible to count up/down by 1'.

Next, in processing step 31, provisional access is executed to the necessary virtual storage area using a predetermined command to check whether a real storage area has been allocated.

As a result, if all the necessary areas have been allocated real storage areas, in processing step 32, the processing of kernel primitives that require access to those areas is executed, and when finished, in processing step 33, the real storage fixed mode display 21 is displayed. Reset (or countdown) to non-fixed mode.

Therefore, as described above, if there is no unallocated area, the process of the kernel primitive routine is performed without performing the control transfer with the real memory management unit 20 and the real memory fixing process as in the prior art.

However, when it is necessary to release the allocation state, the real memory management unit 20 displays the real memory fixed mode display 21 as a test screen, does not execute the allocation release process in the real memory fixed mode, and performs other necessary operations only in the non-fixed mode. If the conditions are satisfied, the release process is executed, so the purpose of fixing the real memory is achieved as described above.

As a result of the check in process step 31, the real memory fixed mode display 21 is reset to the non-fixed mode in process step 34, and then the real memory fixed mode display 21 is reset to the non-fixed mode in process step 10 of FIG. Start the conventional process.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in a process for fixing the real memory allocation state of a virtual memory computer for a required period, when it is sufficient to simply prohibit real memory deallocation, Since it is only necessary to set the real memory fixed mode display, the processing time is reduced and the processing efficiency of the computer is improved, which is a significant industrial effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a flowchart of processing of the present invention, FIG. 3 is a block diagram showing an example of a conventional configuration, and FIG. 4 is a flowchart of conventional processing. In the figure, 1 is an external storage device, 2 is a processing device, 3 is a virtual space,
4 is the real storage area, 5.20 is the real storage management section, 6
．． 22 is a program, 421 is a real memory fixed mode display, 10 to 14 are processing steps, and 30 to 34 are processing steps.

Claims (1)

[Claims] A real memory management unit (
20) and executes a program (22) that accesses the virtual storage area to which the real storage area is allocated, a real storage fixed mode display (21) that can be set to a predetermined state by the program is provided. , the real storage management unit (20) displays the real storage fixed mode display (2) to indicate whether or not a process for canceling the allocation state can be executed for the real storage area (4) allocated to the virtual storage area.
1) A real memory fixed processing method characterized by identification based on the setting state.