diff options
| -rw-r--r-- | mm/hugetlb.c | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index dacf0d2256d9..5b084c7b34c6 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -443,10 +443,23 @@ void reset_vma_resv_huge_pages(struct vm_area_struct *vma) } /* Returns true if the VMA has associated reserve pages */ -static int vma_has_reserves(struct vm_area_struct *vma) +static int vma_has_reserves(struct vm_area_struct *vma, long chg) { - if (vma->vm_flags & VM_NORESERVE) - return 0; + if (vma->vm_flags & VM_NORESERVE) { + /* + * This address is already reserved by other process(chg == 0), + * so, we should decrement reserved count. Without decrementing, + * reserve count remains after releasing inode, because this + * allocated page will go into page cache and is regarded as + * coming from reserved pool in releasing step. Currently, we + * don't have any other solution to deal with this situation + * properly, so add work-around here. + */ + if (vma->vm_flags & VM_MAYSHARE && chg == 0) + return 1; + else + return 0; + } /* Shared mappings always use reserves */ if (vma->vm_flags & VM_MAYSHARE) @@ -520,7 +533,8 @@ static struct page *dequeue_huge_page_node(struct hstate *h, int nid) static struct page *dequeue_huge_page_vma(struct hstate *h, struct vm_area_struct *vma, - unsigned long address, int avoid_reserve) + unsigned long address, int avoid_reserve, + long chg) { struct page *page = NULL; struct mempolicy *mpol; @@ -535,7 +549,7 @@ static struct page *dequeue_huge_page_vma(struct hstate *h, * have no page reserves. This check ensures that reservations are * not "stolen". The child may still get SIGKILLed */ - if (!vma_has_reserves(vma) && + if (!vma_has_reserves(vma, chg) && h->free_huge_pages - h->resv_huge_pages == 0) goto err; @@ -553,8 +567,12 @@ retry_cpuset: if (cpuset_zone_allowed_softwall(zone, htlb_alloc_mask)) { page = dequeue_huge_page_node(h, zone_to_nid(zone)); if (page) { - if (!avoid_reserve && vma_has_reserves(vma)) - h->resv_huge_pages--; + if (avoid_reserve) + break; + if (!vma_has_reserves(vma, chg)) + break; + + h->resv_huge_pages--; break; } } @@ -1155,7 +1173,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma, return ERR_PTR(-ENOSPC); } spin_lock(&hugetlb_lock); - page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve); + page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, chg); if (!page) { spin_unlock(&hugetlb_lock); page = alloc_buddy_huge_page(h, NUMA_NO_NODE); |