From patchwork Wed Jan 17 20:21:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthew Wilcox (Oracle)" X-Patchwork-Id: 10171439 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 AB97C603ED for ; Wed, 17 Jan 2018 20:52:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9B64726247 for ; Wed, 17 Jan 2018 20:52:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 99DE126861; Wed, 17 Jan 2018 20:52:10 +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=ham 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 0B836285E4 for ; Wed, 17 Jan 2018 20:51:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754724AbeAQUtn (ORCPT ); Wed, 17 Jan 2018 15:49:43 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:59515 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752769AbeAQUWq (ORCPT ); Wed, 17 Jan 2018 15:22:46 -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=vn+F9FqObMQXQ2ceR3x3mGVb4NNtPGxQWHSASToK0cg=; b=X4S9N+68Hh7ghS/Q+ktp/57Cw KChuMf2qdYLbfChs1ugXva/EZnZOSOIkuMG//fLsmYYsJvZv6+sVXwPTZZpqO9RUqZrD4ARvIUuO/ d6R77W305iyqkL4UC4ISr8jDjAR5fN+sTmV5g8xu04yIVsdfLeZc6vOp3fp2fLAuS+cy2iR+ew2I9 hlPfjcNUJZLsraHU0cSL9rYDqWNlgRACIGn50PXiYJ/UxF8TFeaHOzq2dSlDg3Nk7jUEtoemgZDeN P2cO+/NYJtQrvnCfN38uPdkEzKG2TFzQ1RONsJlzJb6cwLU4OQ1ou80bTL703AafDS391v4NdTqZH Kzek4/fiA==; Received: from willy by bombadil.infradead.org with local (Exim 4.89 #1 (Red Hat Linux)) id 1ebuEP-0005xU-40; Wed, 17 Jan 2018 20:22:45 +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 49/99] shmem: Convert shmem_partial_swap_usage to XArray Date: Wed, 17 Jan 2018 12:21:13 -0800 Message-Id: <20180117202203.19756-50-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-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Matthew Wilcox Simpler code because the xarray takes care of things like the limit and dereferencing the slot. Signed-off-by: Matthew Wilcox --- mm/shmem.c | 18 +++--------------- 1 file changed, 3 insertions(+), 15 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 5a2226e06f8c..4dbcfb436bd1 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -658,29 +658,17 @@ static int shmem_free_swap(struct address_space *mapping, unsigned long shmem_partial_swap_usage(struct address_space *mapping, pgoff_t start, pgoff_t end) { - struct radix_tree_iter iter; - void **slot; + XA_STATE(xas, &mapping->pages, start); struct page *page; unsigned long swapped = 0; rcu_read_lock(); - - radix_tree_for_each_slot(slot, &mapping->pages, &iter, start) { - if (iter.index >= end) - break; - - page = radix_tree_deref_slot(slot); - - if (radix_tree_deref_retry(page)) { - slot = radix_tree_iter_retry(&iter); - continue; - } - + xas_for_each(&xas, page, end - 1) { if (xa_is_value(page)) swapped++; if (need_resched()) { - slot = radix_tree_iter_resume(slot, &iter); + xas_pause(&xas); cond_resched_rcu(); } }