From: Jan Kara <jack@xxxxxxx> Subject: 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@xxxxxxx Signed-off-by: Jan Kara <jack@xxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxx> Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Dave Chinner <david@xxxxxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/filemap.c | 49 +++++++++++++++++++++++++------------------------ 1 file changed, 25 insertions(+), 24 deletions(-) diff -puN mm/filemap.c~mm-move-accounting-updates-before-page_cache_tree_delete mm/filemap.c --- a/mm/filemap.c~mm-move-accounting-updates-before-page_cache_tree_delete +++ a/mm/filemap.c @@ -224,34 +224,35 @@ void __delete_from_page_cache(struct pag } } - 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, _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
