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| author | David Rientjes <rientjes@google.com> | 2012-05-29 15:06:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-29 16:22:19 -0700 |
| commit | edad9d2c337d43278a9d5aeb0ed531c2e838f8a6 (patch) | |
| tree | 9cd9aba0647d5d1eedd602451cd34f2d514fd30d /mm/huge_memory.c | |
| parent | aa2e878efa7949c8502c9760f92835222714f090 (diff) | |
| download | lwn-edad9d2c337d43278a9d5aeb0ed531c2e838f8a6.tar.gz lwn-edad9d2c337d43278a9d5aeb0ed531c2e838f8a6.zip | |
mm, thp: allow fallback when pte_alloc_one() fails for huge pmd
The transparent hugepages feature is careful to not invoke the oom
killer when a hugepage cannot be allocated.
pte_alloc_one() failing in __do_huge_pmd_anonymous_page(), however,
currently results in VM_FAULT_OOM which invokes the pagefault oom killer
to kill a memory-hogging task.
This is unnecessary since it's possible to drop the reference to the
hugepage and fallback to allocating a small page.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.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.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 8ab2d24faae5..d7d7165156ca 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -640,11 +640,8 @@ static int __do_huge_pmd_anonymous_page(struct mm_struct *mm, VM_BUG_ON(!PageCompound(page)); pgtable = pte_alloc_one(mm, haddr); - if (unlikely(!pgtable)) { - mem_cgroup_uncharge_page(page); - put_page(page); + if (unlikely(!pgtable)) return VM_FAULT_OOM; - } clear_huge_page(page, haddr, HPAGE_PMD_NR); __SetPageUptodate(page); @@ -723,8 +720,14 @@ int do_huge_pmd_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma, put_page(page); goto out; } + if (unlikely(__do_huge_pmd_anonymous_page(mm, vma, haddr, pmd, + page))) { + mem_cgroup_uncharge_page(page); + put_page(page); + goto out; + } - return __do_huge_pmd_anonymous_page(mm, vma, haddr, pmd, page); + return 0; } out: /* |