From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: [PATCH v4 39/73] mm: Convert khugepaged_scan_shmem to XArray Date: Tue, 5 Dec 2017 16:41:25 -0800 Message-ID: <20171206004159.3755-40-willy@infradead.org> References: <20171206004159.3755-1-willy@infradead.org> Return-path: 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=dlAj5/7pYBlaLnGQx3d4VMz5UCI2iMcdpxDKKVLRCW0=; b=QfqH1LYiK34tMKtgb6nPHdHJo 78YTLWjzx+k6Jn73diQno5H4jxUDw8kAPoQOqzE/doackSn15VswTLiASzvNpFMNQ3qK4O9TJHlgc YTtSjlMPklpix3sKOcZYwsqXyt0HlOWnAap5q/ez91jqRYtyAhc0JJfjueHJtVaPvT45xJ/kLSojr s1nOlsGQwRbiY7Z/+AKsVZ3i4UTloXVBZx7mh78jWG82m9K+iB41DrYG1EBIrC2AF4UX094QC/4yJ H2rcebGJEO6ryuYQZQVCgSVokK0ClXFd0N3eakV41/v1HX9V0NwMcmQi26Eknd7EOArquz43ve56A In-Reply-To: <20171206004159.3755-1-willy@infradead.org> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Cc: Matthew Wilcox , Ross Zwisler , Jens Axboe , Rehas Sachdeva , 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, linux-kernel@vger.kernel.org From: Matthew Wilcox Slightly shorter and easier to read code. Signed-off-by: Matthew Wilcox --- mm/khugepaged.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 9f49d0cd61c2..15f1b2d81a69 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1534,8 +1534,7 @@ static void khugepaged_scan_shmem(struct mm_struct *mm, pgoff_t start, struct page **hpage) { struct page *page = NULL; - struct radix_tree_iter iter; - void **slot; + XA_STATE(xas, &mapping->pages, start); int present, swap; int node = NUMA_NO_NODE; int result = SCAN_SUCCEED; @@ -1544,17 +1543,11 @@ static void khugepaged_scan_shmem(struct mm_struct *mm, swap = 0; memset(khugepaged_node_load, 0, sizeof(khugepaged_node_load)); rcu_read_lock(); - radix_tree_for_each_slot(slot, &mapping->pages, &iter, start) { - if (iter.index >= start + HPAGE_PMD_NR) - break; - - page = radix_tree_deref_slot(slot); - if (radix_tree_deref_retry(page)) { - slot = radix_tree_iter_retry(&iter); + xas_for_each(&xas, page, start + HPAGE_PMD_NR - 1) { + if (xas_retry(&xas, page)) continue; - } - if (radix_tree_exception(page)) { + if (xa_is_value(page)) { if (++swap > khugepaged_max_ptes_swap) { result = SCAN_EXCEED_SWAP_PTE; break; @@ -1593,7 +1586,7 @@ static void khugepaged_scan_shmem(struct mm_struct *mm, present++; if (need_resched()) { - slot = radix_tree_iter_resume(slot, &iter); + xas_pause(&xas); cond_resched_rcu(); } } -- 2.15.0