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arm64/mm: enable HugeTLB migration for contiguous bit HugeTLB pages 

Let arm64 subscribe to the previously added framework in which
architecture can inform whether a given huge page size is supported for
migration.  This just overrides the default function
arch_hugetlb_migration_supported() and enables migration for all
possible HugeTLB page sizes on arm64.

With this, HugeTLB migration support on arm64 now covers all possible
HugeTLB options.

          CONT PTE    PMD    CONT PMD    PUD
          --------    ---    --------    ---
  4K:        64K      2M        32M      1G
  16K:        2M     32M         1G
  64K:        2M    512M        16G

Link: http://lkml.kernel.org/r/1545121450-1663-6-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2019-03-05 15:43:58 -08:00 committed by Linus Torvalds
parent 4a03a058d1
commit 5480280d3f
2 changed files with 25 additions and 0 deletions
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5
arch/arm64/include/asm/hugetlb.h
View File

@ -20,6 +20,11 @@
#include <asm/page.h>
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
#define arch_hugetlb_migration_supported arch_hugetlb_migration_supported
extern bool arch_hugetlb_migration_supported(struct hstate *h);
#endif
#define __HAVE_ARCH_HUGE_PTEP_GET
static inline pte_t huge_ptep_get(pte_t *ptep)
{

20
arch/arm64/mm/hugetlbpage.c
View File

@ -27,6 +27,26 @@
#include <asm/tlbflush.h>
#include <asm/pgalloc.h>
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
bool arch_hugetlb_migration_supported(struct hstate *h)
{
size_t pagesize = huge_page_size(h);
switch (pagesize) {
#ifdef CONFIG_ARM64_4K_PAGES
case PUD_SIZE:
#endif
case PMD_SIZE:
case CONT_PMD_SIZE:
case CONT_PTE_SIZE:
return true;
}
pr_warn("%s: unrecognized huge page size 0x%lx\n",
__func__, pagesize);
return false;
}
#endif
int pmd_huge(pmd_t pmd)
{
return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);