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authorBob Liu <lliubbo@gmail.com>2012-12-11 16:00:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-11 17:22:22 -0800
commitfa475e517adb422cb3492e636195f9b2c0d009c8 (patch)
tree832d357b2c403087ee9980742ecc1ad4e546ccb4 /mm/huge_memory.c
parent6219049ae1ce32b89236646cccaec2a5fc6c4fd2 (diff)
thp: introduce hugepage_vma_check()
Multiple places do the same check. Signed-off-by: Bob Liu <lliubbo@gmail.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Ni zhan Chen <nizhan.chen@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c38
1 files changed, 17 insertions, 21 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9ae97242aa8..26002683a16 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1894,6 +1894,20 @@ static struct page
}
#endif
+static bool hugepage_vma_check(struct vm_area_struct *vma)
+{
+ if ((!(vma->vm_flags & VM_HUGEPAGE) && !khugepaged_always()) ||
+ (vma->vm_flags & VM_NOHUGEPAGE))
+ return false;
+
+ if (!vma->anon_vma || vma->vm_ops)
+ return false;
+ if (is_vma_temporary_stack(vma))
+ return false;
+ VM_BUG_ON(vma->vm_flags & VM_NO_THP);
+ return true;
+}
+
static void collapse_huge_page(struct mm_struct *mm,
unsigned long address,
struct page **hpage,
@@ -1934,17 +1948,8 @@ static void collapse_huge_page(struct mm_struct *mm,
hend = vma->vm_end & HPAGE_PMD_MASK;
if (address < hstart || address + HPAGE_PMD_SIZE > hend)
goto out;
-
- if ((!(vma->vm_flags & VM_HUGEPAGE) && !khugepaged_always()) ||
- (vma->vm_flags & VM_NOHUGEPAGE))
- goto out;
-
- if (!vma->anon_vma || vma->vm_ops)
- goto out;
- if (is_vma_temporary_stack(vma))
+ if (!hugepage_vma_check(vma))
goto out;
- VM_BUG_ON(vma->vm_flags & VM_NO_THP);
-
pmd = mm_find_pmd(mm, address);
if (!pmd)
goto out;
@@ -2152,20 +2157,11 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
progress++;
break;
}
-
- if ((!(vma->vm_flags & VM_HUGEPAGE) &&
- !khugepaged_always()) ||
- (vma->vm_flags & VM_NOHUGEPAGE)) {
- skip:
+ if (!hugepage_vma_check(vma)) {
+skip:
progress++;
continue;
}
- if (!vma->anon_vma || vma->vm_ops)
- goto skip;
- if (is_vma_temporary_stack(vma))
- goto skip;
- VM_BUG_ON(vma->vm_flags & VM_NO_THP);
-
hstart = (vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK;
hend = vma->vm_end & HPAGE_PMD_MASK;
if (hstart >= hend)