Commit dc8635b2 authored by Liam R. Howlett's avatar Liam R. Howlett Committed by Andrew Morton
Browse files

mm: optimize find_exact_vma() to use vma_lookup() 

Use vma_lookup() to walk the tree to the start value requested.  If the
vma at the start does not match, then the answer is NULL and there is no
need to look at the next vma the way that find_vma() would.

Link: https://lkml.kernel.org/r/20220906194824.2110408-21-Liam.Howlett@oracle.com


Signed-off-by: default avatarLiam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: default avatarVlastimil Babka <vbabka@suse.cz>
Tested-by: default avatarYu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 7ccf089b

include/linux/mm.h

+1 −1
Original line number Diff line number Diff line
@@ -2850,7 +2850,7 @@ static inline unsigned long vma_pages(struct vm_area_struct *vma) 
static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,

				unsigned long vm_start, unsigned long vm_end)

{

	struct vm_area_struct *vma = find_vma(mm, vm_start);

	struct vm_area_struct *vma = vma_lookup(mm, vm_start);



	if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end))

		vma = NULL;