mm/gup: accelerate thp gup even for "pages != NULL"

The acceleration of THP was done with ctx.page_mask, however it'll be
ignored if **pages is non-NULL.

The old optimization was introduced in 2013 in 240aade ("mm:
accelerate mm_populate() treatment of THP pages").  It didn't explain why
we can't optimize the **pages non-NULL case.  It's possible that at that
time the major goal was for mm_populate() which should be enough back
then.

Optimize thp for all cases, by properly looping over each subpage, doing
cache flushes, and boost refcounts / pincounts where needed in one go.

This can be verified using gup_test below:

  # chrt -f 1 ./gup_test -m 512 -t -L -n 1024 -r 10

Before:    13992.50 ( +-8.75%)
After:       378.50 (+-69.62%)

Link: https://lkml.kernel.org/r/20230628215310.73782-6-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: James Houghton <jthoughton@google.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kirill A . Shutemov <kirill@shutemov.name>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/gup.c

@@ -1282,16 +1282,53 @@ static long __get_user_pages(struct mm_struct *mm,
 			goto out;
 		}
 next_page:
-		if (pages) {
-			pages[i] = page;
-			flush_anon_page(vma, page, start);
-			flush_dcache_page(page);
-			ctx.page_mask = 0;
-		}
-
 		page_increm = 1 + (~(start >> PAGE_SHIFT) & ctx.page_mask);
 		if (page_increm > nr_pages)
 			page_increm = nr_pages;
+
+		if (pages) {
+			struct page *subpage;
+			unsigned int j;
+
+			/*
+			 * This must be a large folio (and doesn't need to
+			 * be the whole folio; it can be part of it), do
+			 * the refcount work for all the subpages too.
+			 *
+			 * NOTE: here the page may not be the head page
+			 * e.g. when start addr is not thp-size aligned.
+			 * try_grab_folio() should have taken care of tail
+			 * pages.
+			 */
+			if (page_increm > 1) {
+				struct folio *folio;
+
+				/*
+				 * Since we already hold refcount on the
+				 * large folio, this should never fail.
+				 */
+				folio = try_grab_folio(page, page_increm - 1,
+						       foll_flags);
+				if (WARN_ON_ONCE(!folio)) {
+					/*
+					 * Release the 1st page ref if the
+					 * folio is problematic, fail hard.
+					 */
+					gup_put_folio(page_folio(page), 1,
+						      foll_flags);
+					ret = -EFAULT;
+					goto out;
+				}
+			}
+
+			for (j = 0; j < page_increm; j++) {
+				subpage = nth_page(page, j);
+				pages[i + j] = subpage;
+				flush_anon_page(vma, subpage, start + j * PAGE_SIZE);
+				flush_dcache_page(subpage);
+			}
+		}
+
 		i += page_increm;
 		start += page_increm * PAGE_SIZE;
 		nr_pages -= page_increm;