Menu
Does the Linux on x86-64 support multiple huge page sizes (e.g., both 2MB and 1GB page sizes beyond the 4KB base page size)? If yes, is there a way to specify that for a given allocation which huge page size to use? In other words, my question is if "MAP_HUGETLB" flag is used while doing mmap() it maps them allocation to hugepages of default size. Is there anyway to request an allocation to be mapped on to non-default hugepage size?
729
The default page size is fixed by what the MMU (memory management unit) of the CPU supports. In 32-bit protected mode x86 supports two kinds of pages: normal ones, 4 KiB. huge ones, 4 MiB.
So, formally defining hugepage, it is a utility that drives virtual memory management in the Linux system. And as the name itself suggests, “huge” sized pages which are in addition to the standard 4KB page size can be managed using the concept. One can easily handle pages as huge as 1GB.
Not quite yet, but it's working its way through the LKML. At a guess, the feature will be available in a few releases time.
You will then be able to use the flags MAP_HUGE_2MB and MAP_HUGE_1GB to configure this explicitly.
50
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
