From 0562457186752b6a65eeca9f5ed0fb9b1e2572e3 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Thu, 12 May 2022 20:23:03 -0700 Subject: [PATCH] mm/shmem: use a folio in shmem_unused_huge_shrink When calling split_huge_page() we usually have to find the precise page, but that's not necessary here because we only need to unlock and put the folio afterwards. Saves 231 bytes of text (20% of this function). Link: https://lkml.kernel.org/r/20220504182857.4013401-17-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Signed-off-by: Andrew Morton --- mm/shmem.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 7cfe763..6cba5fd 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -554,7 +554,7 @@ static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo, LIST_HEAD(to_remove); struct inode *inode; struct shmem_inode_info *info; - struct page *page; + struct folio *folio; unsigned long batch = sc ? sc->nr_to_scan : 128; int split = 0; @@ -598,6 +598,7 @@ next: list_for_each_safe(pos, next, &list) { int ret; + pgoff_t index; info = list_entry(pos, struct shmem_inode_info, shrinklist); inode = &info->vfs_inode; @@ -605,14 +606,14 @@ next: if (nr_to_split && split >= nr_to_split) goto move_back; - page = find_get_page(inode->i_mapping, - (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT); - if (!page) + index = (inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT; + folio = filemap_get_folio(inode->i_mapping, index); + if (!folio) goto drop; /* No huge page at the end of the file: nothing to split */ - if (!PageTransHuge(page)) { - put_page(page); + if (!folio_test_large(folio)) { + folio_put(folio); goto drop; } @@ -623,14 +624,14 @@ next: * Waiting for the lock may lead to deadlock in the * reclaim path. */ - if (!trylock_page(page)) { - put_page(page); + if (!folio_trylock(folio)) { + folio_put(folio); goto move_back; } - ret = split_huge_page(page); - unlock_page(page); - put_page(page); + ret = split_huge_page(&folio->page); + folio_unlock(folio); + folio_put(folio); /* If split failed move the inode on the list back to shrinklist */ if (ret) -- 2.7.4