From patchwork Mon Feb 19 19:45:47 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 10228585 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 2B05D602B1 for ; Mon, 19 Feb 2018 19:48:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1D67D28792 for ; Mon, 19 Feb 2018 19:48:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 12686287AB; Mon, 19 Feb 2018 19:48:10 +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=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 BF58828792 for ; Mon, 19 Feb 2018 19:48:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932078AbeBSTqe (ORCPT ); Mon, 19 Feb 2018 14:46:34 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:45028 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753678AbeBSTq3 (ORCPT ); Mon, 19 Feb 2018 14:46:29 -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=Zv7TOAdMSkAdgcZeYdIAoFRWLnOw/ZVDVF39MgffUEQ=; b=ChCPAtHQ9WJAQxv2KHE7OWWHz bpc/tbB279pJxRDEiFu0m7i1nK7dHd8RyyjJh5dVwG9MdQQ1JpNYZc0Gh8DS5eBsR97uV+lp4TUzc 1t74XzWfEphHC6pM0ObAkq54oVNoG3sBurXCCTr0JmiBB/eSdq+fFo6anfXgaANJk8l+o7i0Sa+3+ 2BOMXNAG4/zXp6kCyjhUUzwa1soSZP6huCq5S6fwv5wkJkSvs7ccTAIneUf39hbZ350OzGCCcJEev KXz0iyeM0XDeixg1A3LE8tPt4FUXsGOG0n5LfC092acxZ1H4mLj1JkqYFZQNnrfGU7mGarq4k7d2x mHCG8DbJg==; Received: from willy by bombadil.infradead.org with local (Exim 4.89 #1 (Red Hat Linux)) id 1enrOO-0001w5-4m; Mon, 19 Feb 2018 19:46:28 +0000 From: Matthew Wilcox To: Andrew Morton Cc: Matthew Wilcox , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v7 52/61] shmem: Convert shmem_partial_swap_usage to XArray Date: Mon, 19 Feb 2018 11:45:47 -0800 Message-Id: <20180219194556.6575-53-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180219194556.6575-1-willy@infradead.org> References: <20180219194556.6575-1-willy@infradead.org> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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 a7931660897d..c24c4cb76c43 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(); } }