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=-9.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 37E86C433DF for ; Wed, 10 Jun 2020 20:18:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 128B22074B for ; Wed, 10 Jun 2020 20:18:17 +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="bAfUEC9x" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727770AbgFJUSP (ORCPT ); Wed, 10 Jun 2020 16:18:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730510AbgFJUNr (ORCPT ); Wed, 10 Jun 2020 16:13:47 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B7EBC03E96F; Wed, 10 Jun 2020 13:13:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=VHXm1L+rObZHMg/ZFaxYy0B7In8iJsSQq6tf5Ix1Zow=; b=bAfUEC9x/4a1ubraNWUhB2jMUA wgZpuusnFmtFWjFCNm5HIyObzZT+pnK8D4l1cleAR398txg/NM5yrWcqn7zHxUMnHxTDA7PDfOuDw 03yZP0DPHgA/tCkMQFX1oAF20OYZAUGhALaBS/9OOR13Cts8cxPylP1T6u5SqJSlrBE0zk94MxbOU OPTGJX+bUeD05te31Hyqsxicqc+YRQZh/n2YdCvWQ4VP2RsdqLQTiC7O7SppH/0rXws9UsQNOFZdH e1rOsqC03rOmUAthexl+Pyv6ghP0UHyhKN8n4YZfsc664UKSCfQSP41zPU7PbpLV1dFj3VjAQ1mf1 RSJ6GprA==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jj76Z-0003T4-C0; Wed, 10 Jun 2020 20:13:47 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 04/51] mm: Move PageDoubleMap bit Date: Wed, 10 Jun 2020 13:12:58 -0700 Message-Id: <20200610201345.13273-5-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200610201345.13273-1-willy@infradead.org> References: <20200610201345.13273-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Matthew Wilcox (Oracle)" PG_private_2 is defined as being PF_ANY (applicable to tail pages as well as regular & head pages). That means that the first tail page of a double-map page will appear to have Private2 set. Use the Workingset bit instead which is defined as PF_HEAD so any attempt to access the Workingset bit on a tail page will redirect to the head page's Workingset bit. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/page-flags.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 222f6f7b2bb3..de6e0696f55c 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -164,7 +164,7 @@ enum pageflags { PG_slob_free = PG_private, /* Compound pages. Stored in first tail page's flags */ - PG_double_map = PG_private_2, + PG_double_map = PG_workingset, /* non-lru isolated movable page */ PG_isolated = PG_reclaim, -- 2.26.2