From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.6 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A0CFC5CFC0 for ; Sun, 17 Jun 2018 02:06:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BF3D52086A for ; Sun, 17 Jun 2018 02:06:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="pZujEGhr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF3D52086A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934162AbeFQCBR (ORCPT ); Sat, 16 Jun 2018 22:01:17 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:59008 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933880AbeFQCBF (ORCPT ); Sat, 16 Jun 2018 22:01:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=e0wudOUZYJQwjzypX+j3m1ttkDOvGtdncskdRKp75uA=; b=pZujEGhrlBP43V7+vrMNtARcd /lzpkm3Fq+C7N0XfgP4VK3L7Lb6VX3KFlDbjv29p2g0vQ4kC+MRAahvvwdoTd+auz1D1KgvKLNITQ EPuvLRbN6WH6FVMD2azUI/dsJ4IJiNbFzAQVU6N1cmL90gH9U6fhmELwBIUv1IBj4EWO4kWa7uWmz 0kXK2mnRY9d3hcR3J9GqcqNhudr6TagHW2ETrfTH2e2dftnCL48ylVHM+yHNbqYBXF0alZLZvcLL+ 4LWF7zpeK+6AB/FJomuMxpOoM4wsyoOo0NkpSUM5l5VZProabnDao5OkoOhCHnxyyXKouXtYAFGYP erodrUtdw==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1fUN04-0001La-Oa; Sun, 17 Jun 2018 02:01:04 +0000 From: Matthew Wilcox To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Matthew Wilcox , Jan Kara , Jeff Layton , Lukas Czerner , Ross Zwisler , Christoph Hellwig , Goldwyn Rodrigues , Nicholas Piggin , Ryusuke Konishi , linux-nilfs@vger.kernel.org, Jaegeuk Kim , Chao Yu , linux-f2fs-devel@lists.sourceforge.net Subject: [PATCH v14 38/74] mm: Convert add_to_swap_cache to XArray Date: Sat, 16 Jun 2018 19:00:16 -0700 Message-Id: <20180617020052.4759-39-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180617020052.4759-1-willy@infradead.org> References: <20180617020052.4759-1-willy@infradead.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Combine __add_to_swap_cache and add_to_swap_cache into one function since there is no more need to preload. Signed-off-by: Matthew Wilcox --- mm/swap_state.c | 93 +++++++++++++++---------------------------------- 1 file changed, 29 insertions(+), 64 deletions(-) diff --git a/mm/swap_state.c b/mm/swap_state.c index dc312559f7df..ca18407a79aa 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -107,14 +107,15 @@ void show_swap_cache_info(void) } /* - * __add_to_swap_cache resembles add_to_page_cache_locked on swapper_space, + * add_to_swap_cache resembles add_to_page_cache_locked on swapper_space, * but sets SwapCache flag and private instead of mapping and index. */ -int __add_to_swap_cache(struct page *page, swp_entry_t entry) +int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp) { - int error, i, nr = hpage_nr_pages(page); - struct address_space *address_space; + struct address_space *address_space = swap_address_space(entry); pgoff_t idx = swp_offset(entry); + XA_STATE(xas, &address_space->i_pages, idx); + unsigned long i, nr = 1UL << compound_order(page); VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(PageSwapCache(page), page); @@ -123,50 +124,30 @@ int __add_to_swap_cache(struct page *page, swp_entry_t entry) page_ref_add(page, nr); SetPageSwapCache(page); - address_space = swap_address_space(entry); - xa_lock_irq(&address_space->i_pages); - for (i = 0; i < nr; i++) { - set_page_private(page + i, entry.val + i); - error = radix_tree_insert(&address_space->i_pages, - idx + i, page + i); - if (unlikely(error)) - break; - } - if (likely(!error)) { + do { + xas_lock_irq(&xas); + xas_create_range(&xas, idx + nr - 1); + if (xas_error(&xas)) + goto unlock; + for (i = 0; i < nr; i++) { + VM_BUG_ON_PAGE(xas.xa_index != idx + i, page); + set_page_private(page + i, entry.val + i); + xas_store(&xas, page + i); + xas_next(&xas); + } address_space->nrpages += nr; __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, nr); ADD_CACHE_INFO(add_total, nr); - } else { - /* - * Only the context which have set SWAP_HAS_CACHE flag - * would call add_to_swap_cache(). - * So add_to_swap_cache() doesn't returns -EEXIST. - */ - VM_BUG_ON(error == -EEXIST); - set_page_private(page + i, 0UL); - while (i--) { - radix_tree_delete(&address_space->i_pages, idx + i); - set_page_private(page + i, 0UL); - } - ClearPageSwapCache(page); - page_ref_sub(page, nr); - } - xa_unlock_irq(&address_space->i_pages); +unlock: + xas_unlock_irq(&xas); + } while (xas_nomem(&xas, gfp)); - return error; -} - - -int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask) -{ - int error; + if (!xas_error(&xas)) + return 0; - error = radix_tree_maybe_preload_order(gfp_mask, compound_order(page)); - if (!error) { - error = __add_to_swap_cache(page, entry); - radix_tree_preload_end(); - } - return error; + ClearPageSwapCache(page); + page_ref_sub(page, nr); + return xas_error(&xas); } /* @@ -217,7 +198,7 @@ int add_to_swap(struct page *page) return 0; /* - * Radix-tree node allocations from PF_MEMALLOC contexts could + * XArray node allocations from PF_MEMALLOC contexts could * completely exhaust the page allocator. __GFP_NOMEMALLOC * stops emergency reserves from being allocated. * @@ -229,7 +210,6 @@ int add_to_swap(struct page *page) */ err = add_to_swap_cache(page, entry, __GFP_HIGH|__GFP_NOMEMALLOC|__GFP_NOWARN); - /* -ENOMEM radix-tree allocation failure */ if (err) /* * add_to_swap_cache() doesn't return -EEXIST, so we can safely @@ -423,19 +403,11 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, break; /* Out of memory */ } - /* - * call radix_tree_preload() while we can wait. - */ - err = radix_tree_maybe_preload(gfp_mask & GFP_KERNEL); - if (err) - break; - /* * Swap entry may have been freed since our caller observed it. */ err = swapcache_prepare(entry); if (err == -EEXIST) { - radix_tree_preload_end(); /* * We might race against get_swap_page() and stumble * across a SWAP_HAS_CACHE swap_map entry whose page @@ -443,26 +415,19 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, */ cond_resched(); continue; - } - if (err) { /* swp entry is obsolete ? */ - radix_tree_preload_end(); + } else if (err) /* swp entry is obsolete ? */ break; - } - /* May fail (-ENOMEM) if radix-tree node allocation failed. */ + /* May fail (-ENOMEM) if XArray node allocation failed. */ __SetPageLocked(new_page); __SetPageSwapBacked(new_page); - err = __add_to_swap_cache(new_page, entry); + err = add_to_swap_cache(new_page, entry, gfp_mask & GFP_KERNEL); if (likely(!err)) { - radix_tree_preload_end(); - /* - * Initiate read into locked page and return. - */ + /* Initiate read into locked page */ lru_cache_add_anon(new_page); *new_page_allocated = true; return new_page; } - radix_tree_preload_end(); __ClearPageLocked(new_page); /* * add_to_swap_cache() doesn't return -EEXIST, so we can safely -- 2.17.1