1 .. _hugetlbpage_index:
2
3 ====================
4 HugeTLBpage on ARM64
5 ====================
6
7 Hugepage relies on making efficient use of TLB
8 address translations. The benefit depends on b
9
10 - the size of hugepages
11 - size of entries supported by the TLBs
12
13 The ARM64 port supports two flavours of hugepa
14
15 1) Block mappings at the pud/pmd level
16 --------------------------------------
17
18 These are regular hugepages where a pmd or a p
19 block of memory. Regardless of the supported s
20 mappings reduce the depth of page table walk n
21 addresses.
22
23 2) Using the Contiguous bit
24 ---------------------------
25
26 The architecture provides a contiguous bit in
27 (D4.5.3, ARM DDI 0487C.a) that hints to the MM
28 contiguous set of entries that can be cached i
29
30 The contiguous bit is used in Linux to increas
31 pte (last) level. The number of supported cont
32 and level of the page table.
33
34
35 The following hugepage sizes are supported -
36
37 ====== ======== ==== ======== ===
38 - CONT PTE PMD CONT PMD PUD
39 ====== ======== ==== ======== ===
40 4K: 64K 2M 32M 1G
41 16K: 2M 32M 1G
42 64K: 2M 512M 16G
43 ====== ======== ==== ======== ===
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