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Commit 66a01387 authored by Li Xinhai's avatar Li Xinhai Committed by Greg Kroah-Hartman
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mm/hugetlb.c: fix unnecessary address expansion of pmd sharing 

commit a1ba9da8f0f9a37d900ff7eff66482cf7de8015e upstream.

The current code would unnecessarily expand the address range.  Consider
one example, (start, end) = (1G-2M, 3G+2M), and (vm_start, vm_end) =
(1G-4M, 3G+4M), the expected adjustment should be keep (1G-2M, 3G+2M)
without expand.  But the current result will be (1G-4M, 3G+4M).  Actually,
the range (1G-4M, 1G) and (3G, 3G+4M) would never been involved in pmd
sharing.

After this patch, we will check that the vma span at least one PUD aligned
size and the start,end range overlap the aligned range of vma.

With above example, the aligned vma range is (1G, 3G), so if (start, end)
range is within (1G-4M, 1G), or within (3G, 3G+4M), then no adjustment to
both start and end.  Otherwise, we will have chance to adjust start
downwards or end upwards without exceeding (vm_start, vm_end).

Mike:

: The 'adjusted range' is used for calls to mmu notifiers and cache(tlb)
: flushing.  Since the current code unnecessarily expands the range in some
: cases, more entries than necessary would be flushed.  This would/could
: result in performance degradation.  However, this is highly dependent on
: the user runtime.  Is there a combination of vma layout and calls to
: actually hit this issue?  If the issue is hit, will those entries
: unnecessarily flushed be used again and need to be unnecessarily reloaded?

Link: https://lkml.kernel.org/r/20210104081631.2921415-1-lixinhai.lxh@gmail.com


Fixes: 75802ca66354 ("mm/hugetlb: fix calculation of adjust_range_if_pmd_sharing_possible")
Signed-off-by: default avatarLi Xinhai <lixinhai.lxh@gmail.com>
Suggested-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5d55a6a4

mm/hugetlb.c

+12 −10
Original line number Diff line number Diff line
@@ -4706,21 +4706,23 @@ static bool vma_shareable(struct vm_area_struct *vma, unsigned long addr) 
void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma,

				unsigned long *start, unsigned long *end)

{

	unsigned long a_start, a_end;

	unsigned long v_start = ALIGN(vma->vm_start, PUD_SIZE),

		v_end = ALIGN_DOWN(vma->vm_end, PUD_SIZE);



	if (!(vma->vm_flags & VM_MAYSHARE))

	/*

	 * vma need span at least one aligned PUD size and the start,end range

	 * must at least partialy within it.

	 */

	if (!(vma->vm_flags & VM_MAYSHARE) || !(v_end > v_start) ||

		(*end <= v_start) || (*start >= v_end))

		return;



	/* Extend the range to be PUD aligned for a worst case scenario */

	a_start = ALIGN_DOWN(*start, PUD_SIZE);

	a_end = ALIGN(*end, PUD_SIZE);

	if (*start > v_start)

		*start = ALIGN_DOWN(*start, PUD_SIZE);



	/*

	 * Intersect the range with the vma range, since pmd sharing won't be

	 * across vma after all

	 */

	*start = max(vma->vm_start, a_start);

	*end = min(vma->vm_end, a_end);

	if (*end < v_end)

		*end = ALIGN(*end, PUD_SIZE);

}



/*