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thp: rename split_huge_page_pmd() to split_huge_pmd()

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We are going to decouple splitting THP PMD from splitting underlying
compound page.

This patch renames split_huge_page_pmd*() functions to split_huge_pmd*()
to reflect the fact that it doesn't imply page splitting, only PMD.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Steve Capper <steve.capper@linaro.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
2016-01-15 16:52:42 -08:00
committed by Linus Torvalds
parent b1caa957ae
commit 78ddc53473
10 changed files with 25 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
mm/huge_memory.c
View File

@@ -1233,13 +1233,13 @@ alloc:
if (unlikely(!new_page)) {
if (!page) {
split_huge_page_pmd(vma, address, pmd);
split_huge_pmd(vma, pmd, address);
ret |= VM_FAULT_FALLBACK;
} else {
ret = do_huge_pmd_wp_page_fallback(mm, vma, address,
pmd, orig_pmd, page, haddr);
if (ret & VM_FAULT_OOM) {
split_huge_page(page);
split_huge_pmd(vma, pmd, address);
ret |= VM_FAULT_FALLBACK;
}
put_user_huge_page(page);
@@ -1252,10 +1252,10 @@ alloc:
true))) {
put_page(new_page);
if (page) {
split_huge_page(page);
split_huge_pmd(vma, pmd, address);
put_user_huge_page(page);
} else
split_huge_page_pmd(vma, address, pmd);
split_huge_pmd(vma, pmd, address);
ret |= VM_FAULT_FALLBACK;
count_vm_event(THP_FAULT_FALLBACK);
goto out;
@@ -3131,17 +3131,7 @@ again:
goto again;
}
void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
pmd_t *pmd)
{
struct vm_area_struct *vma;
vma = find_vma(mm, address);
BUG_ON(vma == NULL);
split_huge_page_pmd(vma, address, pmd);
}
static void split_huge_page_address(struct mm_struct *mm,
static void split_huge_pmd_address(struct vm_area_struct *vma,
unsigned long address)
{
pgd_t *pgd;
@@ -3150,7 +3140,7 @@ static void split_huge_page_address(struct mm_struct *mm,
VM_BUG_ON(!(address & ~HPAGE_PMD_MASK));
pgd = pgd_offset(mm, address);
pgd = pgd_offset(vma->vm_mm, address);
if (!pgd_present(*pgd))
return;
@@ -3159,13 +3149,13 @@ static void split_huge_page_address(struct mm_struct *mm,
return;
pmd = pmd_offset(pud, address);
if (!pmd_present(*pmd))
if (!pmd_present(*pmd) || !pmd_trans_huge(*pmd))
return;
/*
* Caller holds the mmap_sem write mode, so a huge pmd cannot
* materialize from under us.
*/
split_huge_page_pmd_mm(mm, address, pmd);
__split_huge_page_pmd(vma, address, pmd);
}
void vma_adjust_trans_huge(struct vm_area_struct *vma,
@@ -3181,7 +3171,7 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma,
if (start & ~HPAGE_PMD_MASK &&
(start & HPAGE_PMD_MASK) >= vma->vm_start &&
(start & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= vma->vm_end)
split_huge_page_address(vma->vm_mm, start);
split_huge_pmd_address(vma, start);
/*
* If the new end address isn't hpage aligned and it could
@@ -3191,7 +3181,7 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma,
if (end & ~HPAGE_PMD_MASK &&
(end & HPAGE_PMD_MASK) >= vma->vm_start &&
(end & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= vma->vm_end)
split_huge_page_address(vma->vm_mm, end);
split_huge_pmd_address(vma, end);
/*
* If we're also updating the vma->vm_next->vm_start, if the new
@@ -3205,6 +3195,6 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma,
if (nstart & ~HPAGE_PMD_MASK &&
(nstart & HPAGE_PMD_MASK) >= next->vm_start &&
(nstart & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= next->vm_end)
split_huge_page_address(next->vm_mm, nstart);
split_huge_pmd_address(next, nstart);
}
}