diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-09-06 22:48:46 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-27 05:46:15 +0300 |
| commit | 2e3af1db174423e0fb75c7887251f168d8401424 (patch) | |
| tree | 4b78e588cd3312b7451066b94b421b14a3894f2c | |
| parent | f39af05949a4280b9f04d5dd0f606b81aac3dae8 (diff) | |
| download | linux-2e3af1db174423e0fb75c7887251f168d8401424.tar.xz | |
mmap: use the VMA iterator in count_vma_pages_range()
This simplifies the implementation and is faster than using the linked
list.
Link: https://lkml.kernel.org/r/20220906194824.2110408-11-Liam.Howlett@oracle.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/mmap.c | 24 |
1 files changed, 7 insertions, 17 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 20718645d82f..f1b07751a1e4 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -629,29 +629,19 @@ munmap_vma_range(struct mm_struct *mm, unsigned long start, unsigned long len, return 0; } + static unsigned long count_vma_pages_range(struct mm_struct *mm, unsigned long addr, unsigned long end) { - unsigned long nr_pages = 0; + VMA_ITERATOR(vmi, mm, addr); struct vm_area_struct *vma; + unsigned long nr_pages = 0; - /* Find first overlapping mapping */ - vma = find_vma_intersection(mm, addr, end); - if (!vma) - return 0; - - nr_pages = (min(end, vma->vm_end) - - max(addr, vma->vm_start)) >> PAGE_SHIFT; - - /* Iterate over the rest of the overlaps */ - for (vma = vma->vm_next; vma; vma = vma->vm_next) { - unsigned long overlap_len; - - if (vma->vm_start > end) - break; + for_each_vma_range(vmi, vma, end) { + unsigned long vm_start = max(addr, vma->vm_start); + unsigned long vm_end = min(end, vma->vm_end); - overlap_len = min(end, vma->vm_end) - vma->vm_start; - nr_pages += overlap_len >> PAGE_SHIFT; + nr_pages += PHYS_PFN(vm_end - vm_start); } return nr_pages; |