WO2016000470A1

WO2016000470A1 - Memory control method and device

Info

Publication number: WO2016000470A1
Application number: PCT/CN2015/075704
Authority: WO
Inventors: 陈荔城; 刘垚; 陈明宇
Original assignee: 华为技术有限公司
Priority date: 2014-06-30
Filing date: 2015-04-01
Publication date: 2016-01-07
Also published as: CN105335306A; CN105335306B

Abstract

A memory control method and device, the method comprising: a memory control device (600) receives a control policy for a physical memory and a corresponding triggering condition (S101), the triggering condition comprising a change in state information of the physical memory and/or an access process received by the memory control device (600); the memory control device (600) monitors the state information of the physical memory and the access process (S102); when the triggering condition is satisfied, the memory control device (600) invokes the corresponding control policy to control the physical memory (S103). Therefore, the memory control device (600) serving as hardware acquires from a system the necessary control policy, physical memory control semantic information required for carrying out the control policy, and the triggering condition of the corresponding control measurement, such that when the triggering condition is satisfied, the memory control device (600) can invoke the control policy corresponding to the triggering condition to control the physical memory without a system raising a page fault in the control process, thus improving control efficiency.

Description

Memory control method and device

Technical field

The present invention relates to the field of computers, and in particular, to a memory control method and apparatus.

Background technique

In the system running, the processor accesses the physical memory through the access process. Currently, it is directly responsible for processing these through software, such as an operating system (OS), a virtual machine monitor (VMM), and the like. Access the process and control the physical memory accordingly.

When the system performs process control on physical memory, it generates a large number of signaling interactions with physical memory. A large part of the signaling interaction basically needs to be implemented by the system through interrupt processing (such as page fault), and the system is in each When interrupt processing is performed, the relevant context information in the physical memory at the time of interrupt processing needs to be saved, so that the control process consumes a large amount of system resources. It can be seen that the overhead of directly controlling the physical memory through the software system is very large. In some systems, the interrupt processing may even cause an average delay of more than 2600 CPU clock cycles, which greatly affects the overall working efficiency of the system.

It can be seen that the efficiency of the system directly controlling the physical memory as hardware is very low.

Summary of the invention

In order to solve the above technical problem, the present invention provides a memory control method and apparatus, which enable a system to control physical memory through a hardware control device, thereby improving efficiency.

The embodiment of the invention discloses the following technical solutions:

In a first aspect, the present invention provides a memory control method, the method comprising:

The memory control device receives a control policy for the physical memory and a corresponding trigger condition, where the control policy carries upper layer semantic information for implementing the control policy, where the trigger condition includes a change in state information of the physical memory and/or The access process received by the memory control device;

The memory control device monitors status information of the physical memory and the access process;

When the trigger condition is met, the memory control device invokes a corresponding control policy to control the physical memory.

In a first possible implementation of the first aspect,

The address information of the physical memory includes a physical address and a virtual address;

The memory control device performs a virtual real address translation operation between the physical address and the virtual address of the physical memory by using a translation look-aside buffer TLB included in the memory control device, so that:

The access process accesses the physical memory by using the virtual address of the physical memory through the memory control device; the memory control device uses the physical address of the physical memory to the physical memory by using the virtual real address translation operation Take control.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in the second possible implementation manner, when the triggering condition includes that the access process is specifically a request to lock a page, the method includes:

When the memory control device detects that the access process is specifically locking the specified page in the physical memory, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, specifically include:

The memory control device parses physical memory address information of the specified page used in the access process to determine physical page information of the specified page;

And if the specified page is in the physical memory, the memory control device locks the specified page in the physical memory;

If the specified page is not in the physical memory, the memory control device swaps in and locks the specified page in the physical memory.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation, when the access process specifically includes requesting to allocate a physical page for the direct memory access buffer DMA Buffer, the method includes:

When the memory control device monitors that the access process specifically allocates a physical page for the DMA buffer, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, specifically:

The memory control device allocates a physical page for the DMA Buffer from the physical memory;

The memory control device locks the allocated physical page in the physical memory, and locks a page table entry corresponding to the physical page in the TLB.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a fourth possible implementation manner, when the triggering condition includes that the accessing process specifically causes a page fault interrupt to occur, the method includes:

When the memory control device detects that the access process specifically causes a page fault interrupt to occur, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, specifically:

The memory control device determines a replacement page of the page that caused the page fault interrupt and feeds back to the sender that sent the access process.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in a fifth possible implementation manner, when the trigger condition includes a change in state information of the physical memory, specifically, a change in memory capacity, include:

When the memory control device monitors that the change of the state information of the physical memory is specifically changed by the memory capacity, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, specifically include:

When the physical memory capacity changes, specifically, the physical memory capacity increases, the memory control device determines the capacity and type of the increased physical memory, and updates the state information after the physical memory change;

When the physical memory capacity changes, specifically, the physical memory capacity decreases, the memory control device copies the reduced page content stored in the physical memory to the free space of the remaining memory in the physical memory, and updates the State information after a change in physical memory.

With reference to the first aspect or the first or second or the third or the fourth or the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the method further includes:

When the state information of the physical memory changes, the memory control device feeds back the state information after the physical memory change to the sender that sends the control policy for the physical memory and the corresponding trigger condition, the change Including memory capacity changes, memory type changes, or memory usage rates that meet predetermined thresholds;

The memory control device receives a control policy sent by the sender corresponding to the changed state information of the physical memory and a corresponding trigger condition.

In a second aspect, the present invention provides a memory control device, including:

a receiving unit, configured to receive a control policy for the physical memory and a corresponding triggering condition, where the control policy carries upper layer semantic information for implementing the control policy, where the triggering condition includes a change of state information of the physical memory / or the access process received by the memory control device;

a monitoring unit, configured to monitor status information of the physical memory and the access process;

a control unit, configured to invoke a corresponding when the result of the monitoring unit satisfies the trigger condition The control strategy controls the physical memory.

In a first possible implementation manner of the second aspect, when the address information of the physical memory includes a physical address and a virtual address, the method further includes:

And a converting unit, configured to perform a virtual real address translation operation between the physical address and the virtual address of the physical memory by using a translation look-aside buffer TLB included by the translation buffer TLB:

The access process uses the virtual address of the physical memory to access the physical memory through the conversion unit; the conversion unit controls the physical memory by using the physical address of the physical memory by the virtual real address translation operation .

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the method includes:

When the result of the monitoring unit meets the triggering condition, the control unit specifically uses the request to lock the page, and is specifically used to:

Parsing physical memory address information of the specified page used in the access process to determine physical page information of the specified page;

If the specified page is in the physical memory, the specified page is locked in the physical memory;

If the specified page is not in the physical memory, the specified page is swapped in and locked in the physical memory.

In conjunction with the second possible implementation of the second aspect, in a third possible implementation manner, the method includes:

The control unit is specifically configured to: when the result of the listening unit meets the trigger condition, that the access process specifically includes requesting to allocate a physical page for the direct memory access buffer DMA Buffer,

Allocating a physical page for the DMA Buffer from the physical memory;

The allocated physical page is locked in the physical memory, and the page table entry corresponding to the physical page is locked in the TLB.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a fourth possible implementation manner, the method includes:

The control unit is specifically configured to: when the result of the listening unit meets the trigger condition, that the access process specifically causes a page fault interrupt to occur, specifically:

A replacement page of the page that caused the page fault interrupt is determined and fed back to the sender that sent the access process.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a fifth possible implementation manner, the method includes:

The control unit is specifically configured to: when the result of the monitoring unit meets the triggering condition, the triggering condition includes that the change of the state information of the physical memory is specifically changed by the memory capacity, specifically:

When the physical memory capacity changes, specifically, the physical memory capacity is reduced, copying the page content stored in the reduced physical memory into the free space of the remaining memory in the physical memory, and updating the physical memory after the change Status information.

With reference to the second aspect or the first or second or the third or the fourth or the fifth possible implementation manner of the second aspect, in a sixth possible implementation manner, the method further includes:

a feedback unit, configured to: when the state information of the physical memory changes, feed back the state information after the physical memory is changed to a sender that sends the control policy for the physical memory and a corresponding trigger condition, where the change Including memory capacity changes, memory type changes, or memory usage rates that meet predetermined thresholds;

The receiving unit is further configured to receive a control policy that is sent by the sender and corresponding to the state information after the change of the physical memory, and a corresponding trigger condition.

It can be seen from the above technical solution that the memory control device as a hardware acquires necessary control strategies from the system, physical memory control semantic information required to complete the control policies, and corresponding trigger conditions for controlling the measurement, so that when a trigger condition is met, The memory control device can control the physical memory by calling a control policy corresponding to the trigger condition, and the system does not need to perform interrupt processing in the control process, thereby improving control efficiency.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

FIG. 1 is a flowchart of a method for memory control according to an embodiment of the present invention;

2 is a schematic diagram of a method for performing physical page locking on physical memory according to an embodiment of the present invention;

3 is a structural diagram of a device for memory control according to an embodiment of the present invention;

4 is a structural diagram of a device for memory control according to an embodiment of the present invention;

FIG. 5 is a structural diagram of a device for memory control according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of hardware of a memory control device according to an embodiment of the present invention.

detailed description

It can be seen from the prior art that using a system (OS) as software to control physical memory as hardware requires frequent hardware and software interactions, which causes a great overhead to the system itself and causes a large amount of processing delay. But in fact, the control of physical memory is that most of the control operations on physical memory are relatively simple, not necessarily using complex software to complete, you can use other hardware (such as memory controller, Memory) Control ler) to perform these control operations, such as the judgment of illegal address access, the first visit of the page, and page replacement. In response to this feature, an embodiment of the present invention provides a memory control method and apparatus, using a memory control device as a hardware to acquire necessary control policies from a system, physical memory control semantic information required to complete these control strategies, and corresponding control measurements. The triggering condition is such that when a trigger condition is met, the memory control device can call the control strategy corresponding to the trigger condition to control the physical memory, and the system does not need to perform interrupt processing in the process of control, thereby greatly improving the control. effectiveness.

The embodiment of the present invention further integrates hardware (for example, a typical translation lookaside buffer (TLB)) that can perform address translation between a virtual address and a physical address according to the physical address and the virtual address of the physical memory. As part of the memory control device, the memory control device can also process an access process using a virtual address to access physical memory, which further improves the scope of application of the embodiments of the present invention.

The technical solutions in the embodiments of the present invention will be clearly described in conjunction with the drawings in the embodiments of the present invention. Some embodiments, rather than all of the embodiments, are invented. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Embodiment 1

This embodiment will describe how the memory control device controls the physical memory. Referring to FIG. 1 , it is a flowchart of a memory control method according to an embodiment of the present invention, where the method includes:

S101: The memory control device receives a control policy for the physical memory and a corresponding trigger condition, where the control policy carries upper layer semantic information for implementing the control policy, where the trigger condition includes a change of state information of the physical memory. / or the access process received by the memory control device.

It should be noted that the control strategy described herein is mainly used to guide the memory control device to control physical memory, such as limiting the available physical memory quota of the access process, setting page priority, locking the page, etc., but performing these The control policy needs to use the corresponding upper layer semantic information, such as operation commands, and may include: process creation or termination, virtual address allocation or release, etc., and send operation commands, such as how to lock (Pin) a physical page in physical memory, Pin A page entry corresponding to a virtual address space is in the TLB, and so on. The upper layer semantic information also refers to semantic information that is not included in the original hardware and is mainly executed by software.

The triggering condition may be one or more, and each of the triggering conditions may be corresponding to one or more control policies. The related content will be described in different embodiments in the second embodiment, and details are not described herein again.

The memory control device can acquire the control policies and the corresponding triggering conditions in multiple manners, such as obtaining from the system (OS), or by setting in advance, etc., how the present invention acquires the policy for the memory control device. And the corresponding trigger conditions are not limited.

S102: The memory control device monitors status information of the physical memory and the access process.

S103: When the trigger condition is met, the memory control device invokes a corresponding control policy to control the physical memory.

The two steps need to be explained that since the control policy and the trigger condition acquired in S101 have a corresponding relationship, once the trigger condition is met, the memory control device 6 already has the necessary upper layer semantic information. Therefore, the memory control device invokes the corresponding control strategy, that is, the upper layer semantic information can be used for corresponding processing according to the control strategy, for example, locking a specified page in physical memory, processing a page fault interrupt, and the like that the system needs to be processed and physical. Memory related situation. Determining the category of the access process can be done by accessing the process identifier (pid).

It can be seen that the memory control device as a hardware acquires necessary control policies from the system, physical memory control semantic information required to complete the control policies, and trigger conditions for corresponding control measurements, so that when a trigger condition is met, the memory control device can Call the corresponding trigger condition The control strategy controls the physical memory, and the system does not need to perform interrupt processing in the process of control, which greatly improves the control efficiency.

Embodiment 2

This embodiment will expand the trigger condition on the basis of the first embodiment, and describe how the memory control device processes and controls the physical memory according to different trigger conditions.

Before the description of the triggering condition is described, the physical memory includes a physical address and a virtual address. The physical address and the virtual address generally have a mapping relationship. In the prior art, as a software. When the system controls or accesses the physical memory, you need to pay attention to the physical address of the physical memory. For example, when you perform the Direct Memory Access (DMA) operation command on the physical memory, you need to have various restrictions. For example, the physical address must be continuous. , must start from a low address, etc., the operation process is rather cumbersome. In the embodiment of the present invention, the memory control device integrates the TLB as an integral part of itself, and flexibly applies the conversion function of the virtual real address to the control of the physical memory. Optionally, the embodiment of the present invention further includes:

The address information of the physical memory includes a physical address and a virtual address.

The memory control device performs a virtual real address translation operation between the physical address and the virtual address of the physical memory by using a TLB included in the memory control device, so that:

That is to say, the access process for the physical memory can directly access the virtual address of the physical memory, so that in some cases, it is no longer necessary to consider whether the physical address of the accessed physical memory is continuous and from the low address. Initially, only the continuous virtual address needs to be used directly for related operations, and the detailed content will be described in the section on how the memory control device supports DMA operations.

The following describes the deployment of the triggering conditions, and describes how the memory control device processes and controls the physical memory according to different triggering conditions. At least five different trigger condition conditions are provided, which may be implemented on the basis of the first embodiment, or may be implemented on the basis of adding a virtual real address translation in the embodiment, which is not limited by the present invention. .

The first case:

Optionally, when the triggering condition includes that the accessing process is specifically a request to lock a page, the method includes:

When the memory control device detects that the access process is specifically requesting to lock the specified page in the physical memory, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory. Specifically include:

The memory control device parses the physical memory address information of the specified page used in the access process to determine physical page information of the specified page.

And if the specified page is in the physical memory, the memory control device locks the specified page in the physical memory.

Because the memory control device itself cannot know the priority or importance of the page saved in the physical memory for the current application scenario, when the physical memory is controlled, it is very likely that the important page is swapped out of the physical memory. As a result, the efficiency of the system is reduced. Therefore, after the system considers the priority or importance of the page, in order to prevent some important pages from being swapped out of physical memory, the system sends an access process to the memory control device to lock the specified page. When the memory control device receives the access process that requires the specified page to be locked, the corresponding trigger condition is triggered, and the memory control device invokes the corresponding control policy, including the query page, the lock page, and the like.

Further illustrated by way of example,

For example, in the embodiment, the application scenario of the locked page is as shown in FIG. 2 . FIG. 2 is a schematic diagram of a method for physically locking a physical memory according to an embodiment of the present invention.

S201: The system sends, to the memory control device, a access process in which an address space (which may refer to a specified page) is in memory, and the access process (or a Pin command) The format can be: Pin start_addr len (or Pin pid). The Pin command is added to the command queue of the memory control device. The Pin command can be encapsulated and implemented by calling the mlock or mlock_al l function of the system standard, thereby keeping the system interface compatible, without any modification to the application system, and without requiring the system interrupt to switch to the kernel state, and the system does not need to process .

S202: When the memory control device schedules execution from the command queue to the Pin command, acquires an operation type (Pin) and an operation parameter (an address space) of the Pin command.

S203: The memory control device queries the TLB in the memory control device by using a virtual address of the specified page, and obtains a physical address of the specified page.

S204: If the specified page has not been allocated, the memory control device locks the specified page in the physical memory by setting an attribute of the specified page to be locked (PG_mlocked). In the subsequent operation of the physical memory, the specified page that is locked will not be swapped out of the physical memory.

If the physical page is swapped out (present=0), the memory control device initiates Swap, swaps the specified page into the physical memory, and further performs a lock page on the specified page. Operation.

S205: After the execution of the Pin command is completed, the memory control device may further notify the system, for example, may send response information.

The second case:

Optionally, when the access process specifically includes requesting to allocate a physical page for a direct memory access buffer (DMA Buffer), the method includes:

The memory control device locks the allocated physical page in the physical memory, and The page table entry corresponding to the physical page is locked in the TLB.

What needs to be explained for DMA is that DMA has a wide range of applications. For example, DMA is required to read and write data from a file on disk to memory; DMA is required to send and receive network packets from the network card to the memory; from the PCIE device The storage space needs to use DMA when reading and writing data to memory.

That is, the access process allocates a DMA Buffer space in the virtual address space through the operating system, and sends a command requesting a DMA Buffer physical space to the memory controller;

The memory controller executes a command for allocating a physical space of the DMA Buffer, the hardware allocates corresponding physical pages, and locks the pages in the memory, and locks the corresponding page table entries in the TLB in the memory controller; The physical pages allocated for the DMA Buffer can be arbitrarily allocated without having to occupy a contiguous physical address space; thus breaking the limitation of the DMA on the DMA Buffer requiring continuous physical pages.

The operating system sends a DMA request to the DMA controller using the virtual address space corresponding to the DMA Buffer and the disk space information to be accessed.

The DMA controller sends a data read/write request to the memory controller using a virtual address;

The memory controller directly queries the TLB on the virtual address to obtain the corresponding physical address, thereby reading data from a peripheral device (such as a disk) into a physical page where the DMA Buffer is located or writing data from the DMA Buffer to the peripheral device. .

The third case:

Optionally, when the triggering condition includes that the accessing process specifically causes a page fault interrupt to occur, the method includes:

It should be noted here that the situation of the page fault interruption mainly refers to the visit of the access process. The target page of the question is not stored in the physical memory. When a page fault interrupt occurs due to an access process, the memory control device needs to determine an alternate page for this page fault interrupt. Compared with the prior art, the process of determining the replacement page in the prior art is required to be completed by the memory control device in the embodiment of the present invention, that is, in the process of determining the replacement page. Finding a blank page, whether it can be a replacement page, and whether the page is clean can be done by the memory control device. This greatly simplifies the operating load of the system in the event of page faults and increases the processing speed of the system.

The fourth situation:

Optionally, when the triggering condition includes the change of the state information of the physical memory, specifically, the memory capacity changes, including:

When the physical memory capacity changes, specifically, the physical memory capacity increases, the memory control device determines the capacity and type of the increased physical memory, and updates the state information after the physical memory change.

It should be noted that the physical memory is currently hot swappable, and the type of physical memory is more diverse. Therefore, the capacity and type of the physical memory controlled by the memory control device may change at any time. In the embodiment of the present invention, the memory control device can monitor the change of the state information of the physical memory, and can perform corresponding processing and operations on the change of the capacity of the physical memory.

Further examples are given through actual application scenarios:

When the physical memory is hot swapped, the underlying hardware (such as the BIOS) sends a corresponding hot plug of the memory to the memory control device through a corresponding interface, where the corresponding interface may be Advanced configuration and power management interface (Advanced Configuration and Power Management Interface, ACPI).

When the memory control device receives the memory hot plug event, the memory structure in the physical memory is correspondingly adjusted, and when the capacity of the physical memory is increased, for example, the newly inserted physical memory, the The memory control device adds the newly added physical memory to the Free List of the memory management (if the system is a free page linked list of the Buddy System in Linux); when the capacity of the physical memory is reduced, for example, the physical When a part of the memory is removed, the valid data contained in the extracted physical memory needs to be first added to the free page in the remaining physical memory, and the correspondence between the corresponding data and the storage address in the physical memory is reset. Therefore, the processing of the memory hot swap event by the memory control device does not require the participation of the system, and the system can be completely transparent.

Further, the memory control device may also identify a type of physical memory, such as a newly added physical memory, and the memory control device determines a storage type of the newly added physical memory, such as PCM or DRAM. For example, in the case of reducing physical memory, the memory control device determines the storage type of the remaining physical memory. When the memory control device needs to store data in the physical memory, different types of data may be stored into a corresponding type of physical memory according to the type of the data, for example, according to the characteristics of the PCM non-volatile, the system indicates The memory control device places important data structures in the PCM space to improve system reliability and stability. According to the PCM read slow write feature, the system can instruct the memory control device to place the program code segment and the read-only data segment in the PCM space. Other data with more write access can be allocated to the DRAM space.

The fifth situation:

Optionally, it also includes:

It should be noted here that the present situation mainly means that the memory control device also has a system to the system. The state information of the physical memory is fed back, so that the system determines a corresponding control policy according to the current state information of the physical memory, and sends the newly determined control policy to the memory control device. By directly controlling the feedback of the memory control device of the physical memory, the system can effectively grasp the change of the state information of the physical memory, thereby sending a more practical control strategy to the memory control device, and allowing the memory to be controlled. The device is able to control the physical memory more specifically.

The fifth case may be implemented on the basis of the first embodiment or the virtual real address translation is added in the embodiment, and may be at least the other four cases (the first case to the fourth case). Combined implementation. For example, the fifth case may be implemented in combination with the fourth case. When the fourth case occurs (that is, a hot plug event occurs), the capacity or type of the physical memory basically changes. In this case, the fifth situation is triggered, so that the system will further release the state information of the current physical memory fed back by the memory control device to the memory control device to issue a more targeted control strategy and corresponding trigger. condition. There are also many possible combinations of triggers, which are no longer exhaustive.

In summary, the memory control device as a hardware acquires the necessary control strategies from the system, the physical memory control semantic information required to complete the control strategies, and the trigger conditions for corresponding control measurements, such that when a trigger condition is met, the memory control The device can control the physical memory by calling a control policy corresponding to the trigger condition, and the system does not need to perform interrupt processing in the control process, thereby greatly improving the control efficiency.

Embodiment 3

Referring to FIG. 3, FIG. 3 is a structural diagram of a device for memory control according to an embodiment of the present invention, including:

The receiving unit 301 is configured to receive a control policy for the physical memory and a corresponding triggering condition, where the control policy carries upper layer semantic information for implementing the control policy, where the triggering condition includes a change of status information of the physical memory. And/or the access process received by the memory control device.

For a description of the content of the receiving unit 301, refer to the related description in Embodiment 1 S101, and details are not described herein again.

The monitoring unit 302 is configured to monitor status information of the physical memory and the access process.

For a description of the content performed by the monitoring unit 302, refer to the related description in Embodiment 1 S102, and details are not described herein again.

The control unit 303 is configured to invoke the corresponding control policy to control the physical memory when the result of the monitoring unit satisfies the trigger condition.

For a description of the content of the control unit 303, refer to the related description in Embodiment 1 S103, and details are not described herein again.

Optionally, on the basis of the embodiment shown in FIG. 3, when the address information of the physical memory includes a physical address and a virtual address, the memory control apparatus may further include a converting unit 401, where FIG. 4 is implemented according to the present invention. The device structure diagram of a memory control provided by the example, as shown in FIG. 4, further includes:

The converting unit 401 is configured to perform a virtual real address translation operation between the physical address and the virtual address of the physical memory by using a translation look-aside buffer TLB included by the translation buffer TLB.

For a description of the content of the conversion unit 401, refer to the related description of the virtual real address translation operation between the physical address and the virtual address in the second embodiment, and details are not described herein again.

The following describes the deployment of the triggering conditions, and describes how the memory control device processes and controls the physical memory according to different triggering conditions. The embodiment of the present invention provides at least five different triggering conditions. The triggering condition may be implemented on the basis of the first embodiment, or may be implemented based on the addition of the virtual real address translation in the embodiment, which is not limited by the present invention.

The first case:

Optional, including:

The control unit is specifically configured to: when the result of the monitoring unit meets the triggering condition, that the access process is specifically a locked page, specifically:

The second case:

Optional, including:

Allocating a physical page for the DMA Buffer from the physical memory;

The third case:

Optional, including:

The fourth situation:

Optional, including:

The fifth situation:

Optionally, on the basis of the embodiment shown in FIG. 3, the memory control device may further include a feedback unit 501, where FIG. 5 is a device for memory control according to an embodiment of the present invention. The composition, as shown in Figure 5, also includes:

The feedback unit 501 is configured to: when the state information of the physical memory changes, feed back the state information after the physical memory is changed to a sender that sends the control policy for the physical memory and a corresponding trigger condition, where Changes include changes in memory capacity, memory type changes, or memory usage that meet predetermined thresholds;

The receiving unit 301 is further configured to receive a control policy that is sent by the sender and that corresponds to the state information after the physical memory is changed, and a corresponding trigger condition.

It can be seen that the memory control device as a hardware acquires necessary control policies from the system, physical memory control semantic information required to complete the control policies, and trigger conditions for corresponding control measurements, so that when a trigger condition is met, the memory control device can The control system corresponding to the trigger condition is called to control the physical memory, and the system does not need to perform interrupt processing in the process of control, thereby greatly improving the control efficiency.

Embodiment 4

Referring to FIG. 6, FIG. 6 is a schematic diagram of a hardware structure of a memory control device according to an embodiment of the present invention. The memory control device 600 includes a memory 601 and a receiver 602, and the memory 601 and the receiver respectively. The processor 603 is configured to store a set of program instructions, and the processor 603 is configured to invoke the program instructions stored by the memory 601 to perform the following operations:

Triggering the receiver 602 to receive a control policy for physical memory and a corresponding trigger condition, the control policy carrying upper layer semantic information for implementing the control policy, the trigger condition including a change of status information of the physical memory And/or an access process received by the memory control device;

Monitoring status information of physical memory and the access process;

When the trigger condition is met, the corresponding control strategy is invoked to control the physical memory.

Optionally, the processor 603 may be a central processing unit (CPU), and the memory 601 may be an internal memory of a random access memory (RAM) type, and the receiver 602 may be Contains a common physical interface, The physical interface may be an Ethernet interface or an Asynchronous Transfer Mode (ATM) interface. The processor 603, the receiver 602, and the memory 601 may be integrated into one or more independent circuits or hardware, such as an Application Specific Integrated Circuit (ASIC).

It should be noted that those skilled in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage. In the medium, the program, when executed, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

The foregoing is a detailed description of a memory control method and apparatus provided by the present invention. The principles and embodiments of the present invention are described herein with reference to specific embodiments. The description of the above embodiments is only for helping to understand the method of the present invention. And the core idea of the present invention; at the same time, those skilled in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. In summary, the content of the present specification should not be construed as the present invention. limits.

Claims

A memory control method, the method comprising:

The memory control device receives a control policy for the physical memory and a corresponding trigger condition, where the control policy carries upper layer semantic information for implementing the control policy, where the trigger condition includes a change in state information of the physical memory and/or The access process received by the memory control device;

The memory control device monitors status information of the physical memory and the access process;

When the trigger condition is met, the memory control device invokes a corresponding control policy to control the physical memory.
The method of claim 1 wherein

The address information of the physical memory includes a physical address and a virtual address;

The memory control device performs a virtual real address translation operation between the physical address and the virtual address of the physical memory by using a translation look-aside buffer TLB included in the memory control device, so that:

The access process accesses the physical memory by using the virtual address of the physical memory through the memory control device; the memory control device uses the physical address of the physical memory to the physical memory by using the virtual real address translation operation Take control.
The method according to claim 1 or 2, wherein when the triggering condition includes that the accessing process is specifically a request to lock a page, the method includes:

When the memory control device detects that the access process is specifically locking the specified page in the physical memory, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, specifically include:

The memory control device parses physical memory address information of the specified page used in the access process to determine physical page information of the specified page;

And if the specified page is in the physical memory, the memory control device locks the specified page in the physical memory;

If the specified page is not in the physical memory, the memory control device swaps in and locks the specified page in the physical memory.
The method according to claim 3, wherein when the accessing process specifically comprises requesting to allocate a physical page for the direct memory access buffer DMA Buffer, the method comprises:

When the memory control device detects that the access process is specifically a DMA Buffer distributor When the page is processed, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, including:

The memory control device allocates a physical page for the DMA Buffer from the physical memory;

The memory control device locks the allocated physical page in the physical memory, and locks a page table entry corresponding to the physical page in the TLB.
The method according to claim 1 or 2, wherein when the triggering condition includes that the accessing process specifically causes a page fault interrupt to occur, the method includes:

When the memory control device detects that the access process specifically causes a page fault interrupt to occur, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, specifically:

The memory control device determines a replacement page of the page that caused the page fault interrupt and feeds back to the sender that sent the access process.
The method according to claim 1 or 2, wherein when the triggering condition includes a change in state information of the physical memory, specifically, a change in memory capacity, the method includes:

When the memory control device monitors that the change of the state information of the physical memory is specifically changed by the memory capacity, the triggering condition is met, and the memory control device invokes a corresponding control policy to control the physical memory, specifically include:

When the physical memory capacity changes, specifically, the physical memory capacity increases, the memory control device determines the capacity and type of the increased physical memory, and updates the state information after the physical memory change;

When the physical memory capacity changes, specifically, the physical memory capacity decreases, the memory control device copies the reduced page content stored in the physical memory to the free space of the remaining memory in the physical memory, and updates the State information after a change in physical memory.
The method according to any one of claims 1 to 6, further comprising:

When the state information of the physical memory changes, the memory control device feeds back the state information after the physical memory change to the sender that sends the control policy for the physical memory and the corresponding trigger condition, the change Including memory capacity changes, memory type changes, or memory usage rates that meet predetermined thresholds;

The memory control device receives a control policy sent by the sender corresponding to the changed state information of the physical memory and a corresponding trigger condition.
A memory control device, comprising:

a receiving unit, configured to receive a control policy for the physical memory and a corresponding triggering condition, where the control policy carries upper layer semantic information for implementing the control policy, where the triggering condition includes a change of state information of the physical memory / or the access process received by the memory control device;

a monitoring unit, configured to monitor status information of the physical memory and the access process;

And a control unit, configured to: when the result of the listening unit meets the trigger condition, invoke a corresponding control policy to control the physical memory.
The device according to claim 8, wherein when the address information of the physical memory includes a physical address and a virtual address, the method further includes:

And a converting unit, configured to perform a virtual real address translation operation between the physical address and the virtual address of the physical memory by using a translation look-aside buffer TLB included by the translation buffer TLB:

The access process uses the virtual address of the physical memory to access the physical memory through the conversion unit; the conversion unit controls the physical memory by using the physical address of the physical memory by the virtual real address translation operation .
The device according to claim 8 or 9, comprising:

When the result of the monitoring unit meets the triggering condition, the control unit specifically uses the request to lock the page, and is specifically used to:

Parsing physical memory address information of the specified page used in the access process to determine physical page information of the specified page;

If the specified page is in the physical memory, the specified page is locked in the physical memory;

If the specified page is not in the physical memory, the specified page is swapped in and locked in the physical memory.
The device according to claim 10, comprising:

The control unit is specifically configured to: when the result of the listening unit meets the trigger condition, that the access process specifically includes requesting to allocate a physical page for the direct memory access buffer DMA Buffer,

Allocating a physical page for the DMA Buffer from the physical memory;

The allocated physical page is locked in the physical memory, and the page table entry corresponding to the physical page is locked in the TLB.
The device according to claim 8 or 9, comprising:

The control unit is specifically configured to: when the result of the listening unit meets the trigger condition, that the access process specifically causes a page fault interrupt to occur, specifically:

A replacement page of the page that caused the page fault interrupt is determined and fed back to the sender that sent the access process.
The device according to claim 8 or 9, comprising:

The control unit is specifically configured to: when the result of the monitoring unit meets the triggering condition, the triggering condition includes that the change of the state information of the physical memory is specifically changed by the memory capacity, specifically:

When the physical memory capacity changes, specifically, the physical memory capacity is reduced, copying the page content stored in the reduced physical memory into the free space of the remaining memory in the physical memory, and updating the physical memory after the change Status information.
The device according to any one of claims 8 to 13, further comprising:

a feedback unit, configured to: when the state information of the physical memory changes, feed back the state information after the physical memory is changed to a sender that sends the control policy for the physical memory and a corresponding trigger condition, where the change Including memory capacity changes, memory type changes, or memory usage rates that meet predetermined thresholds;

The receiving unit is further configured to receive a control policy that is sent by the sender and corresponding to the state information after the change of the physical memory, and a corresponding trigger condition.