Method and apparatus for computer memory management by monitoring frequency of process access

Patent metadata

Field	Value
Publication number	US-9846626-B2
Application number	US-201514754011-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Dec 31, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A memory monitoring method and a computing system. The computing system includes a processor, a memory and a monitor. The monitor obtains memory unit access information and process information of the computer system. The memory unit access information includes the number of access times of each memory unit of the memory. The process information includes information about a mapping relationship between a virtual address and a physical address of each memory units accessed by the current running process. After generating monitoring information, which includes the frequency at which the current running process accesses each memory unit, according to the memory unit access information and the process information, the monitor feeds the monitoring information back to the processor. Thus, the processor can perform memory management according to the monitoring information.

First claim

What is claimed is:

1. A memory monitoring method performed by a monitor in a computer system, comprising:
listening, with the monitor separately coupled to a central processing unit (CPU), on a memory bus of the computer system to obtain memory unit access information of the computer system, wherein the memory unit access information comprises a number of access times of each memory unit of the computer system;
obtaining process information of the computer system, comprising:
receiving a memory access address from the CPU;
detecting a special memory access address from the memory access address using a specific identifier of the memory access address, wherein the special memory access address comprises encoded process information of the computer system, and wherein the specific identifier comprises information for identifying a presence of the encoded process information in the memory access address; and
decoding the detected special memory access address to obtain the process information, wherein the process information comprises information about a mapping relationship between a virtual address and a physical address of a current running process of the computer system, and wherein the physical address of the current running process is a physical address of each memory unit accessed by the current running process;

generating monitoring information according to the memory unit access information and the process information, wherein the monitoring information comprises a frequency at which the current running process accesses each memory unit; and
feeding the monitoring information back to the CPU of the computer system, wherein the monitoring information is used by the CPU for managing memory.

2. The method according to claim 1 , wherein listening on the memory bus of the computer system comprises performing bypass listening on the memory bus of the computer system.

3. The method according to claim 1 , wherein generating the monitoring information according to the memory unit access information and the process information comprises:
generating, according to the number of access times of each memory unit of the computer system and the process information, the frequency at which the current running process accesses each memory unit; and
classifying the number of access times of each memory unit of the computer system into a number of access times of one or more of a Bank, a Rank, a memory module, and a memory channel so as to obtain statistics information, wherein the statistics information comprises the number of access times of one or more of the Bank, the Rank, the memory module, and the memory channel.

4. The method according to claim 1 , wherein feeding the monitoring information back to the CPU of the computer system comprises:
storing the monitoring information into a buffer created in advance in the computer system; and
updating a memory status bit accessed by the CPU to indicate that the monitoring information has been stored into the buffer.

5. The method according to claim 1 , wherein feeding the monitoring information back to the CPU of the computer system comprises:
receiving, from the CPU, a command to obtain the monitoring information; and
feeding the monitoring information back to the CPU.

6. The method according to claim 1 , wherein the memory unit access information further comprises a reuse distance of each memory unit of the computer system, and wherein the method further comprises feeding the reuse distance of each memory unit of the computer system back to the CPU.

7. The method according to claim 1 , wherein the specific identifier includes a plurality of flag bits.

8. A computer system, comprising:
a processor;
a memory comprising instructions and a plurality of memory units; and
a monitor separately coupled from the processor, wherein the instructions cause the monitor to be configured to:
listen on a memory bus of the computer system to obtain memory unit access information of the computer system, wherein the memory unit access information comprises a number of access times of each memory unit of the memory;
obtain process information of the computer system, comprising:
receive a memory access address from the processor;
detect a special memory access address from the memory access address using a specific identifier of the memory access address, wherein the special memory access address comprises encoded process information of the computer system, and wherein the specific identifier comprises information configured to identify a presence of the encoded process information in the memory access address; and
decode the detected special memory access address to obtain the process information of the computer system, wherein the process information comprises information about a mapping relationship between a virtual address and a physical address of a current running process of the computer system, and wherein the physical address of the current running process is a physical address of each memory unit accessed by the current running process;

generate monitoring information according to the memory unit access information and the process information, wherein the monitoring information comprises a frequency at which the current running process accesses each memory unit; and
feed the monitoring information back to the processor of the computer system, wherein the monitoring information is used by the processor for managing memory.

9. The computing system according to claim 8 , wherein the instructions cause the monitor to be configured to perform bypass listening on the memory bus of the computer system to obtain the memory unit access information of the computer system.

10. The computing system according to claim 8 , wherein the instructions cause the monitor to be configured to:
generate, according to the number of access times of each memory unit of the memory and the process information, the frequency at which the current running process accesses each memory unit; and
classify the number of access times of each memory unit of the memory into a number of access times of one or more of a Bank, a Rank, a memory module, and a memory channel, so as to obtain statistics information, wherein the statistics information comprises the number of access times of one or more of the Bank, the Rank, the memory module, and the memory channel.

11. The computing system according to claim 8 , wherein the instructions cause the monitor to be configured to:
store the monitoring information into a buffer created in advance in the computer system; and
update a memory status bit accessed by the processor to indicate that the monitoring information has been stored into the buffer.

12. The computing system according to claim 8 , wherein the instructions cause the monitor to be configured to:
receive, from the processor, a command to obtain the monitoring information; and
feed the monitoring information back to the processor.

13. The computing system according to claim 8 , wherein the memory unit access information further comprises a reuse distance of each memory unit of the memory, and wherein the monitor is further configured to feed the reuse distance of each memory unit of the memory back to the processor.

14. The computing system according to claim 8 , wherein the specific identifier includes a plurality of flag bits.

Assignees

• Huawei Tech Co Ltd

Inventors

• Cui Zehan
• Chen Mingyu
• Chen Licheng
• Chen Mingyang

Classifications

• G06F2201/815

  Virtual · CPC title

• G06F2201/88

  Monitoring involving counting · CPC title

• G06F12/10

  Address translation · CPC title

• G06F11/3466

  Performance evaluation by tracing or monitoring · CPC title

• G06F11/3452

  Performance evaluation by statistical analysis · CPC title