From 2b26736c88db85c038e04c2306d0745553e69602 Mon Sep 17 00:00:00 2001 From: Andy Whitcroft Date: Tue, 12 Aug 2008 15:08:49 -0700 Subject: [PATCH] allocate structures for reservation tracking in hugetlbfs outside of spinlocks v2 [Andrew this should replace the previous version which did not check the returns from the region prepare for errors. This has been tested by us and Gerald and it looks good. Bah, while reviewing the locking based on your previous email I spotted that we need to check the return from the vma_needs_reservation call for allocation errors. Here is an updated patch to correct this. This passes testing here.] Signed-off-by: Andy Whitcroft Tested-by: Gerald Schaefer Cc: Mel Gorman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/hugetlb.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 4c97c174e2e1..67a71191136e 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1949,7 +1949,10 @@ retry: * the spinlock. */ if (write_access && !(vma->vm_flags & VM_SHARED)) - vma_needs_reservation(h, vma, address); + if (vma_needs_reservation(h, vma, address) < 0) { + ret = VM_FAULT_OOM; + goto backout_unlocked; + } spin_lock(&mm->page_table_lock); size = i_size_read(mapping->host) >> huge_page_shift(h); @@ -1976,6 +1979,7 @@ out: backout: spin_unlock(&mm->page_table_lock); +backout_unlocked: unlock_page(page); put_page(page); goto out; @@ -2004,8 +2008,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, entry = huge_ptep_get(ptep); if (huge_pte_none(entry)) { ret = hugetlb_no_page(mm, vma, address, ptep, write_access); - mutex_unlock(&hugetlb_instantiation_mutex); - return ret; + goto out_unlock; } ret = 0; @@ -2019,7 +2022,10 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, * consumed. */ if (write_access && !pte_write(entry)) { - vma_needs_reservation(h, vma, address); + if (vma_needs_reservation(h, vma, address) < 0) { + ret = VM_FAULT_OOM; + goto out_unlock; + } if (!(vma->vm_flags & VM_SHARED)) pagecache_page = hugetlbfs_pagecache_page(h, @@ -2039,6 +2045,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, put_page(pagecache_page); } +out_unlock: mutex_unlock(&hugetlb_instantiation_mutex); return ret; -- 2.20.1