From patchwork Wed Jan 17 20:20:49 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 10171053 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A598A603B5 for ; Wed, 17 Jan 2018 20:34:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 973DA21327 for ; Wed, 17 Jan 2018 20:34:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8BA4921C9A; Wed, 17 Jan 2018 20:34:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4169721327 for ; Wed, 17 Jan 2018 20:34:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753921AbeAQUW6 (ORCPT ); Wed, 17 Jan 2018 15:22:58 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:46467 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753561AbeAQUWg (ORCPT ); Wed, 17 Jan 2018 15:22:36 -0500 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=qbj9i5QcTqZoabnIEWTIZHsTgYM/VqOJ3iBYVoW1fKE=; b=Yr+HiQxQQIoeIonBYb1kr7s7x pu+ZYuUEg6jbjD83xmeG8EAy4V5owRZIbGdW0NvU3bWKS0Jjlv/gUMYiP5DRERfrddeubwrUcJoz0 MzfZujlV8UEQDiute87hd0sRfPuXFD5eqiHxSMSksYrODAkDobwuD6lzIS0QnKSUffE7rUk+lVHPs wNrpaIoHRl3W1nzdv/RG5c6iCEPxu3QAP1J9fjtnP1ohZrrz/yfeoYJtv5wOH2vw2nsCvNuGQvcW5 JpUQyajKU4BmBJqWZIx3H9BzKAoCPaAy2clZLmdy+ssn72d3S9G5PR9Czd6ym6T5ptlm3hoc2p/AY P+1rdlZZA==; Received: from willy by bombadil.infradead.org with local (Exim 4.89 #1 (Red Hat Linux)) id 1ebuEE-0005mg-O5; Wed, 17 Jan 2018 20:22:34 +0000 From: Matthew Wilcox To: linux-kernel@vger.kernel.org Cc: Matthew Wilcox , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-usb@vger.kernel.org, Bjorn Andersson , Stefano Stabellini , iommu@lists.linux-foundation.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org, linux-sh@vger.kernel.org, David Howells Subject: [PATCH v6 25/99] page cache: Convert page deletion to XArray Date: Wed, 17 Jan 2018 12:20:49 -0800 Message-Id: <20180117202203.19756-26-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180117202203.19756-1-willy@infradead.org> References: <20180117202203.19756-1-willy@infradead.org> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Matthew Wilcox The code is slightly shorter and simpler. Signed-off-by: Matthew Wilcox --- mm/filemap.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index e6371b551de1..ed30d5310e50 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -112,30 +112,28 @@ * ->tasklist_lock (memory_failure, collect_procs_ao) */ -static void page_cache_tree_delete(struct address_space *mapping, +static void page_cache_delete(struct address_space *mapping, struct page *page, void *shadow) { - int i, nr; + XA_STATE(xas, &mapping->pages, page->index); + unsigned int i, nr; - /* hugetlb pages are represented by one entry in the radix tree */ + mapping_set_update(&xas, mapping); + + /* hugetlb pages are represented by a single entry in the xarray */ nr = PageHuge(page) ? 1 : hpage_nr_pages(page); VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(PageTail(page), page); VM_BUG_ON_PAGE(nr != 1 && shadow, page); - for (i = 0; i < nr; i++) { - struct radix_tree_node *node; - void **slot; - - __radix_tree_lookup(&mapping->pages, page->index + i, - &node, &slot); - - VM_BUG_ON_PAGE(!node && nr != 1, page); - - radix_tree_clear_tags(&mapping->pages, node, slot); - __radix_tree_replace(&mapping->pages, node, slot, shadow, - workingset_lookup_update(mapping)); + i = nr; +repeat: + xas_store(&xas, shadow); + xas_init_tags(&xas); + if (--i) { + xas_next(&xas); + goto repeat; } page->mapping = NULL; @@ -235,7 +233,7 @@ void __delete_from_page_cache(struct page *page, void *shadow) trace_mm_filemap_delete_from_page_cache(page); unaccount_page_cache_page(mapping, page); - page_cache_tree_delete(mapping, page, shadow); + page_cache_delete(mapping, page, shadow); } static void page_cache_free_page(struct address_space *mapping,