Dynamic page sizing of page table entries
In accordance with one embodiment each page table entry maps a variable page size (per entry), if multiple continuous virtual pages map to contiguous physical pages. This may drastically reduce the number of translation lookaside buffer (TLB) entries needed since each entry can potentially map a larger chunk of memory, in some embodiments.
1. An apparatus comprising:
a graphics processor;
a graphics driver to receive a memory block allocation and, in response to said allocation, to set a page table entry to indicate a variable page table block size to match a size of the allocation; and
a memory coupled to said processor.
2. The apparatus of claim 1 , said graphics driver to set the page table entry to indicate the block size.
3. The apparatus of claim 1 , said graphics driver to use a base memory unit size and to specify a multiple of said size as the variable page table block size in a page table entry.
4. The apparatus of claim 3 wherein said base memory unit size is 4 KB.
5. The apparatus of claim 1 wherein said graphics driver to dynamically indicate said page table block size in multiples of 4 KB.
6. The apparatus of claim 1 , said graphics driver to dynamically indicate one of at least four selectable variable page table block sizes.
7. The apparatus of claim 1 , said graphics driver to indicate the page table block size at a size other than 4 KB, 64 KB, or 2 MB.
8. The apparatus of claim 1 , said graphics driver to indicate the page table entry size to reduce the number of translation lookaside buffer entries.
9. A system comprising:
a graphics processor;
a graphics driver to receive a memory block allocation and, in response to said allocation, to set a page table entry to indicate a variable page table block size to match a size of the allocation;
a memory coupled to said graphics processor; and
a central processing unit to provide said memory block allocation to said graphics driver.
10. The system of claim 9 , said graphics driver to set the page table entry to indicate the block size.
11. The system of claim 9 , said graphics driver to use a base memory unit size and to specify a multiple of said size as the variable page table block size in a page table entry.
12. The system of claim 11 wherein said base memory unit size is 4 KB.
13. The system of claim 9 wherein said graphics driver to dynamically indicate said page table block size in multiples of 4 KB.
14. The system of claim 9 , said graphics driver to dynamically indicate one of at least four selectable variable page table block sizes.
15. The system of claim 9 , said graphics driver to indicate the page table block size at a size other than 4 KB, 64 KB, or 2 MB.
16. The system of claim 9 , said graphics driver to indicate the page table entry size to reduce the number of translation lookaside buffer entries.
17. One or more non-transitory computer readable media storing instructions to perform a sequence comprising:
receiving a request for a page table size based on a size of memory block allocation; and
in response to said allocation, setting a page table entry to indicate a variable page table block size to match the allocation size.
18. The media of claim 17 , said media storing instructions to perform a sequence including setting the page table entry to indicate that allocation size.
19. The media of claim 17 , said media storing instructions to perform a sequence including using a base memory unit size and to specify a multiple of said size as the variable page table block size in a page table entry.
20. The media of claim 19 , said media storing instructions to perform a sequence further storing instructions to perform a sequence wherein said base memory unit size is 4 KB.
21. The media of claim 17 , said media storing instructions to perform a sequence including dynamically setting said page table block size in multiples of 4 KB.
22. The media of claim 17 , said media storing instructions to perform a sequence including dynamically setting one of at least four selectable variable page table block sizes.
23. The media of claim 17 , said media storing instructions to perform a sequence including setting the page table block size at a size other than 4 KB, 64 KB, or 2 MB.
24. The media of claim 17 , said media storing instructions to perform a sequence including setting the page table entry size to reduce the number of translation lookaside buffer entries.