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authorAndi Kleen <ak@suse.de>2008-07-24 00:27:43 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 13:47:17 -0400
commita137e1cc6d6e7d315fef03962a2a5a113348b13b (patch)
treeb47e195c392abaa3640cc2f9187d99d58cee664a /mm/hugetlb.c
parente5ff215941d59f8ae6bf58f6428dc5c26745a612 (diff)
hugetlbfs: per mount huge page sizes
Add the ability to configure the hugetlb hstate used on a per mount basis. - Add a new pagesize= option to the hugetlbfs mount that allows setting the page size - This option causes the mount code to find the hstate corresponding to the specified size, and sets up a pointer to the hstate in the mount's superblock. - Change the hstate accessors to use this information rather than the global_hstate they were using (requires a slight change in mm/memory.c so we don't NULL deref in the error-unmap path -- see comments). [np: take hstate out of hugetlbfs inode and vma->vm_private_data] Acked-by: Adam Litke <agl@us.ibm.com> Acked-by: Nishanth Aravamudan <nacc@us.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c16
1 files changed, 3 insertions, 13 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 82378d44a0c..4cf7a90e914 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1439,19 +1439,9 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
1439void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, 1439void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
1440 unsigned long end, struct page *ref_page) 1440 unsigned long end, struct page *ref_page)
1441{ 1441{
1442 /* 1442 spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);
1443 * It is undesirable to test vma->vm_file as it should be non-null 1443 __unmap_hugepage_range(vma, start, end, ref_page);
1444 * for valid hugetlb area. However, vm_file will be NULL in the error 1444 spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);
1445 * cleanup path of do_mmap_pgoff. When hugetlbfs ->mmap method fails,
1446 * do_mmap_pgoff() nullifies vma->vm_file before calling this function
1447 * to clean up. Since no pte has actually been setup, it is safe to
1448 * do nothing in this case.
1449 */
1450 if (vma->vm_file) {
1451 spin_lock(&vma->vm_file->f_mapping->i_mmap_lock);
1452 __unmap_hugepage_range(vma, start, end, ref_page);
1453 spin_unlock(&vma->vm_file->f_mapping->i_mmap_lock);
1454 }
1455} 1445}
1456 1446
1457/* 1447/*