MANAGING A COLLECTION OF DATA

• US 20190324682A1
• Filed: 07/03/2019
• Published: 10/24/2019
• Est. Priority Date: 10/02/2008
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Bartik, Jane H., Heller, Lisa C., Osisek, Damian L., Schmidt, Donald W., West, JR., Patrick M., Yeh, Phil C.
• Granted Patent: US 10,620,877 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 12/06 Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication G06F12/08 takes precedence
• CPC Class Codes: G06F 12/0802 Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
• CPC Class Codes: G06F 13/24 using interrupt G06F13/32 takes precedence
• CPC Class Codes: G06F 2212/461 Sector or disk block
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0653 Monitoring storage devices or systems
• CPC Class Codes: G06F 3/0656 Data buffering arrangements
• CPC Class Codes: G06F 3/0673 Single storage device
• CPC Class Codes: G06F 9/30145 Instruction analysis, e.g. decoding, instruction word fields

Abstract

A measurement sampling facility takes snapshots of the central processing unit (CPU) on which it is executing at specified sampling intervals to collect data relating to tasks executing on the CPU. The collected data is stored in a buffer, and at selected times, an interrupt is provided to remove data from the buffer to enable reuse thereof. The interrupt is not taken after each sample, but in sufficient time to remove the data and minimize data loss.

Claims

1. A computer program product for facilitating managing a collection of data within a processing environment, the computer program product comprising:

a computer readable storage medium readable by a processing circuit and storing instructions for performing a method comprising;

obtaining a request for data sampling to be performed, wherein the request indicates a type of data sampling, said type comprising basic sampling, diagnostic sampling or a combination of basic sampling and diagnostic sampling;

storing in a data block of a buffer, based on the request, data relating to execution of one or more tasks of the processing environment, wherein a plurality of stores to the data block are performed;

determining whether the data block has sufficient space for another store of data;

based on determining the data block has insufficient space for the other store, determining whether an alert indicator is set for the data block;

based on determining the alert indicator is set, indicating an interrupt is to be performed; and

storing data of the other store in another data block of the buffer, based on determining the data block has insufficient space.

2. The computer program product of claim 1, wherein the alert indicator is stored in the data block.

3. The computer program product of claim 2, wherein the data block comprises a plurality of data entries, and wherein each store to the data block is to a different data entry of the plurality of data entries.

4. The computer program product of claim 3, wherein the data block further comprises a trailer entry, and wherein the trailer entry includes the alert indicator.

5. The computer program product of claim 4, wherein the method further comprises setting a block full indicator in the trailer entry of the data block, based on determining the data block has insufficient space.

6. The computer program product of claim 3, wherein contents of a data entry address register are used to select the data entry to be stored into, said contents of the data entry address register being updated based on storing the data.

7. The computer program product of claim 1, wherein the method further comprises performing the interrupt, based on completing processing associated with the other store.

8. The computer program product of claim 7, wherein the method further comprises, based on performing the interrupt:

reading data out of the buffer and storing the data on at least one storage medium;

resetting a block full indicator set based on determining there was insufficient space in the data block; and

re-establishing one or more alert indicators for the buffer.

9. The computer program product of claim 1, wherein the data block is pointed to by an entry in a sample data block table.

10. A computer system for facilitating managing a collection of data within a processing environment, the computer system comprising:

a memory; and

a processor in communication with the memory, wherein the computer system is configured to perform a method, said method comprising;

obtaining a request for data sampling to be performed, wherein the request indicates a type of data sampling, said type comprising basic sampling, diagnostic sampling or a combination of basic sampling and diagnostic sampling;

storing in a data block of a buffer, based on the request, data relating to execution of one or more tasks of the processing environment, wherein a plurality of stores to the data block are performed;

determining whether the data block has sufficient space for another store of data;

based on determining the data block has insufficient space for the other store, determining whether an alert indicator is set for the data block;

based on determining the alert indicator is set, indicating an interrupt is to be performed; and

storing data of the other store in another data block of the buffer, based on determining the data block has insufficient space.

11. The computer system of claim 10, wherein the data block comprises a plurality of data entries and a trailer entry, and wherein each store to the data block is to a different data entry of the plurality of data entries, and wherein the trailer entry includes the alert indicator.

12. The computer system of claim 11, wherein contents of a data entry address register are used to select the data entry to be stored into, said contents of the data entry address register being updated based on storing the data.

13. The computer system of claim 10, wherein the method further comprises performing the interrupt, based on completing processing associated with the other store.

14. The computer system of claim 13, wherein the method further comprises, based on performing the interrupt:

reading data out of the buffer and storing the data on at least one storage medium;

resetting a block full indicator set based on determining there was insufficient space in the data block; and

re-establishing one or more alert indicators for the buffer.

15. The computer system of claim 10, wherein the data block is pointed to by an entry in a sample data block table.

16. A computer-implemented method of facilitating managing a collection of data within a processing environment, the computer-implemented method comprising:

obtaining a request for data sampling to be performed, wherein the request indicates a type of data sampling, said type comprising basic sampling, diagnostic sampling or a combination of basic sampling and diagnostic sampling;

storing in a data block of a buffer, based on the request, data relating to execution of one or more tasks of the processing environment, wherein a plurality of stores to the data block are performed;

determining whether the data block has sufficient space for another store of data;

based on determining the data block has insufficient space for the other store, determining whether an alert indicator is set for the data block;

based on determining the alert indicator is set, indicating an interrupt is to be performed; and

storing data of the other store in another data block of the buffer, based on determining the data block has insufficient space.

17. The computer-implemented method of claim 16, wherein the data block comprises a plurality of data entries and a trailer entry, and wherein each store to the data block is to a different data entry of the plurality of data entries, and wherein the trailer entry includes the alert indicator.

18. The computer-implemented method of claim 17, wherein contents of a data entry address register are used to select the data entry to be stored into, said contents of the data entry address register being updated based on storing the data.

19. The computer-implemented method of claim 16, further comprising, performing the interrupt, based on completing processing associated with the other store, and wherein based on performing the interrupt:

reading data out of the buffer and storing the data on at least one storage medium;

resetting a block full indicator set based on determining there was insufficient space in the data block; and

re-establishing one or more alert indicators for the buffer.

20. The computer-implemented method of claim 16, wherein the data block is pointed to by an entry in a sample data block table.