Method to improve page out mechanism with compressed memory pools
View Patent ↗A system and method for setting a compression ratio for utilizing a compressed memory pool (which is backed by pinned memory) by a virtual memory manager (VMM). Compression of pages of corresponding segments can be tracked as part of a VMM paging algorithm that compresses pages to store in a compressed memory pool. A segment having pages with an average compression ratio below a threshold is identified. The identified segment pages are prevented from utilizing the compressed memory pool resulting in optimizing the use of the compressed memory pool.
1. A computer program product for setting a compression ratio for utilizing compressed memory by a virtual memory manager (VMM), the computer program product comprising a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory signal per se, the program instructions executable by a computer to cause the computer to perform a method, comprising:
tracking compression of pages of corresponding segments as part of a VMM paging algorithm that compresses pages to store in a compressed memory pool;
identifying a segment having pages with a compression ratio below a threshold; and
preventing the identified segment pages from utilizing the compressed memory pool.
2. The computer program product of claim 1 , further comprising:
sending the identified segment pages to disk paging space.
3. The computer program product of claim 1 , further comprising:
sending the non-identified segment pages having a compression ratio meeting a threshold to a compressed memory pool.
4. The computer program product of claim 1 , further comprising:
specifying an amount of pages in a segment to page-out; and
calculating the compression ratio based on the paged-out pages of the segment.
5. The computer program product of claim 4 , wherein the specified amount of pages is five percent or above of a total number of pages in the segment.
6. The computer program product of claim 4 , further comprising:
marking segments as uncompressible which have pages with an average compression ratio which is below the threshold; and
sending the pages of the segments marked uncompressible to disk paging space.
7. The computer program product of claim 4 , further comprising:
marking segments as compressible which have pages with an average compression ratio meeting or exceeding the threshold; and
sending the pages of the segments marked compressible to the compressed memory pool.
8. The computer program product of claim 1 , further comprising:
specifying an amount of pages in a segment to page-out;
calculating an average compression ratio of the pages based on the paged-out pages of the segment;
marking segments as uncompressible which have pages with an average compression ratio below the threshold; and
marking segments as compressible which have pages with an average compression ratio meeting or exceed the threshold.
9. The computer program product of claim 1 , wherein the threshold compression ratio is fifty percent compressibility for the pages.
10. A computer system for setting a compression ratio for utilizing compressed memory by a virtual memory manager (VMM), the computer system comprising:
one or more computer processors, one or more computer-readable storage media, and program instructions stored on one or more of the computer-readable storage media for execution by at least one of the one or more processors, the program instructions, comprising:
tracking compression of pages of corresponding segments as part of a VMM paging algorithm that compresses pages to store in a compressed memory pool;
identifying a segment having pages with a compression ratio below a threshold; and
preventing the identified segment pages from utilizing the compressed memory pool.
11. The computer system of claim 10 , further comprising:
sending the identified segment pages to disk paging space.
12. The computer system of claim 10 , further comprising:
sending the non-identified segment pages having a compression ratio meeting a threshold to a compressed memory pool.
13. The computer system of claim 10 , further comprising:
specifying an amount of pages in a segment to page-out; and
calculating the compression ratio based on the paged-out pages of the segment.
14. The computer system of claim 13 , wherein the specified amount of pages is five percent or above of a total number of pages in the segment.
15. The computer system of claim 13 , further comprising:
marking segments as uncompressible which have pages with an average compression ratio which is below the threshold; and
sending the pages of the segments marked uncompressible to disk paging space.
16. The computer system of claim 13 , further comprising:
marking segments as compressible which have pages with an average compression ratio meeting or exceeding the threshold; and
sending the pages of the segments marked compressible to the compressed memory pool.
17. The computer system of claim 10 , further comprising:
specifying an amount of pages in a segment to page-out;
calculating an average compression ratio of the pages based on the paged-out pages of the segment;
marking segments as uncompressible which have pages with an average compression ratio below the threshold; and
marking segments as compressible which have pages with an average compression ratio meeting or exceed the threshold.
18. The computer system of claim 10 , wherein the threshold compression ratio is fifty percent compressibility for the pages.