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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 2D7C5C2D0EA for ; Wed, 8 Apr 2020 14:51:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF1E820787 for ; Wed, 8 Apr 2020 14:51:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="Ac3/nMj5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729108AbgDHOv0 (ORCPT ); Wed, 8 Apr 2020 10:51:26 -0400 Received: from mail-ed1-f50.google.com ([209.85.208.50]:42899 "EHLO mail-ed1-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726709AbgDHOv0 (ORCPT ); Wed, 8 Apr 2020 10:51:26 -0400 Received: by mail-ed1-f50.google.com with SMTP id cw6so8836021edb.9 for ; Wed, 08 Apr 2020 07:51:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=3zZRqZBT7bl6XuqCoSGBYjXfPH3OC6gG/jRKiV96AqY=; b=Ac3/nMj52bzfBeFiIMgWtYKLj/5FMVy+22ItcI9qsqUeD/T1Ft6NWOn3nTVsTU8Aa0 WW7Ooxi+yy4n7kEuhw9YzxZlaMP1gzZxCCnQQsoeVpic0k3dMQUwCUlUs8Jrz/z7DY2s iZkEx4JRJqfIra3Es0ozbCIEkGLOBODr/LixI1vvDDVLcNIrhQWotmT1dBvrRAxpP2qr MhE3+0nzuRLXHtMGzawaCevFfknnkm9YFuxVGS6kpg1+r7IXysVmjPhyHMbJlvToywSB VV86gH0/S/zCFvnykz88u0YBi/V68L7vcP9yBr5m+t5Sh3HJvRjKpBehM+6wEA3pv1XV 8z8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=3zZRqZBT7bl6XuqCoSGBYjXfPH3OC6gG/jRKiV96AqY=; b=KMTn/45qLSOJ9m/Vr2ZNRig+6RJoHuA2LTYP5VOM0i2977wAQpZG3n4E8Az8Zx19lD 68yUECDJpsAFVDchDh+Z/thNR2wawn1IpLuGHj1g4SrpvayEP4xQjsz4efT0He2M1NZ7 BtISxDgvHWjQJ47EJY+vgt0rEv8pZxo0eGVpi0BdX23yX6FfCl0aBFimu6ROxPMDuMam RtuWx/qhflS0DQhHGXnzyR6Pbj/KoXD7AGLU0Ut81XvVqUHUrbSaVrxBfcdVZiTLBfFA Zsx46qXCKrl5TXR+yI5UvkgMSwklm3WDbabCyeoVWI0a+44AhVNWjQgpwupjGG/GQ1at sCIQ== X-Gm-Message-State: AGi0Puan1Oy4Lvbh7anExJUPzQcD++lfO53D0VEO1OazrsnPBxhHSQg1 CP8dg8FgQ+3CPhxkndZBObtRd202xyA= X-Google-Smtp-Source: APiQypK6+uQOMxoqN4nUCCUsZ6n5F+dz2DRbrE9+IZabawptpTewzjtnzQNgsWsjgGlj8uyKBxNAAQ== X-Received: by 2002:a2e:988c:: with SMTP id b12mr5251654ljj.138.1586355703999; Wed, 08 Apr 2020 07:21:43 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id v17sm1305530lfe.34.2020.04.08.07.21.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2020 07:21:43 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id B0613101C47; Wed, 8 Apr 2020 17:21:45 +0300 (+03) Date: Wed, 8 Apr 2020 17:21:45 +0300 From: "Kirill A. Shutemov" To: Zi Yan Cc: akpm@linux-foundation.org, Andrea Arcangeli , Yang Shi , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: Re: [PATCHv2 1/8] khugepaged: Add self test Message-ID: <20200408142145.workbzv2n3p27y2w@box> References: <20200403112928.19742-1-kirill.shutemov@linux.intel.com> <20200403112928.19742-2-kirill.shutemov@linux.intel.com> <20200406152035.ga7hk6jfaqzvlete@box> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 06, 2020 at 02:50:32PM -0400, Zi Yan wrote: > khugepaged-58 [001] .... 9913.990380: mm_khugepaged_scan_pmd: mm=00000000283d31fc, scan_pfn=0x2ae4bd, writable=0, referenced=512, none_or_zero=0, status=no_writable_page, unmapped=0 Looks like all failures due to lack of writable ptes. That's very strange because we write to the page on fill. You've mentioned that you run it in VM. I wounder if it can be a virtualizaiton artefact. I run tests under KVM and they are fine. What is your virtualization setup? -- Kirill A. Shutemov