diff options
Diffstat (limited to 'Documentation/arm64/hugetlbpage.rst')
| -rw-r--r-- | Documentation/arm64/hugetlbpage.rst | 41 |
1 files changed, 0 insertions, 41 deletions
diff --git a/Documentation/arm64/hugetlbpage.rst b/Documentation/arm64/hugetlbpage.rst deleted file mode 100644 index b44f939e5210..000000000000 --- a/Documentation/arm64/hugetlbpage.rst +++ /dev/null @@ -1,41 +0,0 @@ -==================== -HugeTLBpage on ARM64 -==================== - -Hugepage relies on making efficient use of TLBs to improve performance of -address translations. The benefit depends on both - - - - the size of hugepages - - size of entries supported by the TLBs - -The ARM64 port supports two flavours of hugepages. - -1) Block mappings at the pud/pmd level --------------------------------------- - -These are regular hugepages where a pmd or a pud page table entry points to a -block of memory. Regardless of the supported size of entries in TLB, block -mappings reduce the depth of page table walk needed to translate hugepage -addresses. - -2) Using the Contiguous bit ---------------------------- - -The architecture provides a contiguous bit in the translation table entries -(D4.5.3, ARM DDI 0487C.a) that hints to the MMU to indicate that it is one of a -contiguous set of entries that can be cached in a single TLB entry. - -The contiguous bit is used in Linux to increase the mapping size at the pmd and -pte (last) level. The number of supported contiguous entries varies by page size -and level of the page table. - - -The following hugepage sizes are supported - - - ====== ======== ==== ======== === - - CONT PTE PMD CONT PMD PUD - ====== ======== ==== ======== === - 4K: 64K 2M 32M 1G - 16K: 2M 32M 1G - 64K: 2M 512M 16G - ====== ======== ==== ======== === |