MANAGING MEMORY OF A COMPUTER

• US 20130036282A1
• Filed: 08/02/2012
• Published: 02/07/2013
• Est. Priority Date: 08/03/2011
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kawachiya, Kiyokuni, Ogata, Kazunori
• Granted Patent: US 9,003,146 B2
• Time in Patent Office: Days
• US Class Current: 711/163
• CPC Class Codes: G06F 12/02 Addressing or allocation; Relocation program address sequencing G06F9/00; arrangements for selecting an address in a digital store G11C8/00
• CPC Class Codes: G06F 12/0253 Garbage collection, i.e. reclamation of unreferenced memory
• CPC Class Codes: G06F 12/14 Protection against unauthorised use of memory or access to memory
• CPC Class Codes: G06F 12/1433 for a module or a part of a module
• CPC Class Codes: G06F 9/46 Multiprogramming arrangements

Abstract

A method for managing data in a memory of a computer. The method includes the steps of: prohibiting a specified memory area in a memory from being accessed temporarily or intermittently; and attaching, to first data, a first mark indicating that the first data has been read when a page fault has occurred as a result of an access by any process to read on the first data; where the first data is present in a specified memory area prohibited from being accessed; and where at least one of the steps is carried out using a computer device.

Claims

1. A method for managing data in a memory of a computer, the method comprising the steps of:

prohibiting a specified memory area in a memory from being accessed temporarily or intermittently; and

attaching, to first data, a first mark indicating that said first data has been read when a page fault has occurred as a result of an access by any process to read on said first data;

wherein said first data is present in a specified memory area prohibited from being accessed; and

wherein at least one of the steps is carried out using a computer device.

2. The method according to claim 1, further comprising the step of:

prohibiting said specified memory area in said memory from being accessed for writing after said step of attaching step said first mark.

3. The method according to claim 2, further comprising the step of:

attaching, to second data, a second mark indicating that said second data has been written when a page fault has occurred as a result of an access by any process to write on said second data, wherein said second data is present in a specified memory area prohibited from being accessed for writing.

4. The method according to claim 3, further comprising the steps of:

moving each of said first data having said first mark and each of said second data having said second mark into individual memory partitions.

5. The method according to claim 4, wherein said step of moving each of said first data having said first mark and each of said second data having said second mark is performed in response to a garbage collection or a restart of a process that executes an access that causes said page fault.

6. A method for managing data in a memory of a computer, the method comprising the steps of:

prohibiting a specified memory area in the memory from being accessed for writing temporarily or intermittently; and

attaching, to data, a mark indicating that said data has been written when a page fault has occurred as a result of an access by any process to write on said data;

wherein said data is present in the memory area prohibited from being accessed for writing; and

wherein at least one of the steps is carried out using a computer device.

7. The method according to claim 6, further comprising the step of:

moving said data having said mark into a separate memory partition.

8. A non-transitory computer readable storage medium tangibly embodying a computer readable program code having computer readable instructions which when implemented, cause a computer to carry out the steps of a method comprising:

prohibiting a specified memory area in a memory from being accessed temporarily or intermittently; and

attaching, to first data, a first mark indicating that said first data has been read when a page fault has occurred as a result of an access by any process to read on said first data;

wherein said first data is present in a specified memory area prohibited from being accessed.

9. The computer readable storage medium according to claim 8, further comprising the step of:

prohibiting said specified memory area in said memory from being accessed for writing after said step of attaching step said first mark.

10. The computer readable storage medium according to claim 9, further comprising the step of:

attaching, to second data, a second mark indicating that said second data has been written when a page fault has occurred as a result of an access by any process to write on said second data, wherein said second data is present in a specified memory area prohibited from being accessed for writing.

11. The computer readable storage medium according to claim 10, further comprising the step of:

moving each of said first data having said first mark and each of said second data having said second mark into individual memory partitions.

12. The computer readable storage medium according to claim 11, wherein said step of moving each of said first data having said first mark and each of said second data having said second mark is performed in response to a garbage collection or a restart of a process that executes an access that causes said page fault.

13. A system for managing data in a memory of a computer, the system comprising:

program instructions to prohibit a specified memory area in a memory from being accessed temporarily or intermittently; and

program instructions to attach, to first data, a first mark indicating that said first data has been read when a page fault has occurred as a result of an access by any process to read on said first data;

wherein said first data is present in a specified memory area prohibited from being accessed.

14. The system according to claim 13, further comprising:

program instructions to prohibit said specified memory area in said memory from being accessed for writing after said first mark is attached.

15. The system according to claim 14, further comprising:

program instructions to attach, to second data, a second mark indicating that said second data has been written when a page fault has occurred as a result of an access by any process to write on said second data, wherein said second data is present in a specified memory area prohibited from being accessed for writing.

16. The system according to claim 15, further comprising:

program instructions to move each of said first data having said first mark and each of said second data having said second mark into individual memory partitions.

17. The system according to claim 16, wherein each of said first data having said first mark and each of said second data having said second mark is moved in response to a garbage collection or a restart of a process that executes an access that causes said page fault.