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=-9.6 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,USER_AGENT_GIT autolearn=unavailable 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 626DDC433E0 for ; Fri, 15 May 2020 13:20:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2CA2B20759 for ; Fri, 15 May 2020 13:20:06 +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="UqUPO/AS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726349AbgEONRB (ORCPT ); Fri, 15 May 2020 09:17:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726171AbgEONRA (ORCPT ); Fri, 15 May 2020 09:17:00 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CBA5C061A0C; Fri, 15 May 2020 06:17:00 -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=UqUPO/AS2C7nEDmWKnfBwxvMuZ FRpK0JzrFPRL2ip0W/rlV4zc+quu0zhsUrETROgrrcdhcstdxlSvrVuc6TKNc00LFhLjFLzumzuAy 6Dnmk/NQ75lXIs//uCViZIXhm1wkb5XRsibNmobrMfdjrDIla4Ew5BeWk12LiITWkMRyVPzvJ6Hd9 zRdEjLk3Hdtf6ckuqUFfxObSB/iuajVnA2RbJ1HvZbibSIPWTsgVh98aOvTJBcSY3atAw0GEGFGDF bUy3XL78CHh9tr4nt9PaD/zdQFzh3lQicCf+Zrg3Lyv1MU0B+8M3ReoV5w31s2CMKQuFV1NBuNXIm Umkj+nnA==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jZaCy-0005Rz-8b; Fri, 15 May 2020 13:17:00 +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 v4 01/36] mm: Move PageDoubleMap bit Date: Fri, 15 May 2020 06:16:21 -0700 Message-Id: <20200515131656.12890-2-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200515131656.12890-1-willy@infradead.org> References: <20200515131656.12890-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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