diff mbox series

[v3,20/21] vfio_iommu_type1: specify FOLL_HINT_BULK to pin_user_pages()

Message ID 20220606203725.1313715-16-ankur.a.arora@oracle.com (mailing list archive)
State New
Headers show
Series huge page clearing optimizations | expand

Commit Message

Ankur Arora June 6, 2022, 8:37 p.m. UTC 
Specify FOLL_HINT_BULK to pin_user_pages_remote() so it is aware
that this pin is part of a larger region being pinned, and can
optimize based on that expectation.

Cc: alex.williamson@redhat.com
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
---
 drivers/vfio/vfio_iommu_type1.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 9394aa9444c1..138b23769793 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -553,6 +553,9 @@  static int vaddr_get_pfns(struct mm_struct *mm, unsigned long vaddr,
 	if (prot & IOMMU_WRITE)
 		flags |= FOLL_WRITE;
 
+	/* Tell gup that this pin iteration is part of a 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);