Specify FOLL_HINT_BULK to pin_user_pages() so it is aware that this pin is part of a larger region being pinned, so it can optimize based on that expectation. Cc: alex.williamson@xxxxxxxxxx Signed-off-by: Ankur Arora <ankur.a.arora@xxxxxxxxxx> --- drivers/vfio/vfio_iommu_type1.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index 0e9217687f5c..0d45b0c6464d 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -557,6 +557,9 @@ static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr, if (prot & IOMMU_WRITE) flags |= FOLL_WRITE; + /* Tell gup that this iterations is part of larger set of pins. */ + flags |= FOLL_HINT_BULK; + mmap_read_lock(mm); ret = pin_user_pages_remote(mm, vaddr, npages, flags | FOLL_LONGTERM, pages, NULL, NULL); -- 2.29.2
