From: Jan Kara Date: Thu, 16 Nov 2017 01:37:22 +0000 (-0800) Subject: mm: move accounting updates before page_cache_tree_delete() X-Git-Tag: v5.15~9997^2~32 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=76253fbc8fbf6018401755fc5c07814a837cc832;p=mirror_ubuntu-kernels.git mm: move accounting updates before page_cache_tree_delete() Move updates of various counters before page_cache_tree_delete() call. It will be easier to batch things this way and there is no difference whether the counters get updated before or after removal from the radix tree. Link: http://lkml.kernel.org/r/20171010151937.26984-5-jack@suse.cz Signed-off-by: Jan Kara Acked-by: Mel Gorman Reviewed-by: Andi Kleen Cc: Dave Chinner Cc: Dave Hansen Cc: "Kirill A. Shutemov" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/filemap.c b/mm/filemap.c index ecf7565ff435..014109e66e4a 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -224,34 +224,35 @@ void __delete_from_page_cache(struct page *page, void *shadow) } } - page_cache_tree_delete(mapping, page, shadow); - - page->mapping = NULL; - /* Leave page->index set: truncation lookup relies upon it */ - /* hugetlb pages do not participate in page cache accounting. */ - if (PageHuge(page)) - return; + if (!PageHuge(page)) { + __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr); + if (PageSwapBacked(page)) { + __mod_node_page_state(page_pgdat(page), NR_SHMEM, -nr); + if (PageTransHuge(page)) + __dec_node_page_state(page, NR_SHMEM_THPS); + } else { + VM_BUG_ON_PAGE(PageTransHuge(page), page); + } - __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr); - if (PageSwapBacked(page)) { - __mod_node_page_state(page_pgdat(page), NR_SHMEM, -nr); - if (PageTransHuge(page)) - __dec_node_page_state(page, NR_SHMEM_THPS); - } else { - VM_BUG_ON_PAGE(PageTransHuge(page), page); + /* + * At this point page must be either written or cleaned by + * truncate. Dirty page here signals a bug and loss of + * unwritten data. + * + * This fixes dirty accounting after removing the page entirely + * but leaves PageDirty set: it has no effect for truncated + * page and anyway will be cleared before returning page into + * buddy allocator. + */ + if (WARN_ON_ONCE(PageDirty(page))) + account_page_cleaned(page, mapping, + inode_to_wb(mapping->host)); } + page_cache_tree_delete(mapping, page, shadow); - /* - * At this point page must be either written or cleaned by truncate. - * Dirty page here signals a bug and loss of unwritten data. - * - * This fixes dirty accounting after removing the page entirely but - * leaves PageDirty set: it has no effect for truncated page and - * anyway will be cleared before returning page into buddy allocator. - */ - if (WARN_ON_ONCE(PageDirty(page))) - account_page_cleaned(page, mapping, inode_to_wb(mapping->host)); + page->mapping = NULL; + /* Leave page->index set: truncation lookup relies upon it */ } static void page_cache_free_page(struct address_space *mapping,