(1) Background
For the arm64, the hugetlb page size can be 32M (PMD + Contiguous bit).
In the 4K page environment, the max page order is 10 (max_order - 1),
so 32M page is the gigantic page.
The arm64 MMU supports a Contiguous bit which is a hint that the TTE
is one of a set of contiguous entries which can be cached in a single
TLB entry. Please refer to the arm64v8 mannul :
DDI0487A_f_armv8_arm.pdf (in page D4-1811)
(2) The bug
After I tested the libhugetlbfs, I found the test case "counter.sh"
will fail with the gigantic page (32M page in arm64 board).
This patch set adds support for gigantic surplus hugetlb pages,
allowing the counter.sh unit test to pass.
v1 -- > v2:
1.) fix the compiler error in X86.
2.) add new patches for NUMA.
The patch #2 ~ #5 are new patches.
Huang Shijie (6):
mm: hugetlb: rename some allocation functions
mm: hugetlb: add a new parameter for some functions
mm: hugetlb: change the return type for alloc_fresh_gigantic_page
mm: mempolicy: intruduce a helper huge_nodemask()
mm: hugetlb: add a new function to allocate a new gigantic page
mm: hugetlb: support gigantic surplus pages
include/linux/mempolicy.h | 8 +++
mm/hugetlb.c | 128 ++++++++++++++++++++++++++++++++++++----------
mm/mempolicy.c | 20 ++++++++
3 files changed, 130 insertions(+), 26 deletions(-)
--
2.5.5
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