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=-2.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 8379AC432C1 for ; Tue, 24 Sep 2019 11:35:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 559A1207FD for ; Tue, 24 Sep 2019 11:35:56 +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="uWyTPD3j" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2504750AbfIXLfz (ORCPT ); Tue, 24 Sep 2019 07:35:55 -0400 Received: from mail-ed1-f68.google.com ([209.85.208.68]:40300 "EHLO mail-ed1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2440846AbfIXLfz (ORCPT ); Tue, 24 Sep 2019 07:35:55 -0400 Received: by mail-ed1-f68.google.com with SMTP id v38so1501316edm.7 for ; Tue, 24 Sep 2019 04:35:54 -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:user-agent; bh=wqOFMWe+mp3c8TorAc2H1VRjzI9RZ5AFH27KTf53AIk=; b=uWyTPD3jGEbt7pWGjVokh/v+Z7M2CKQjwY58Ka6aiG27oed2spgmG/Wx4Zmk6gOLLQ QWcXA22nTaG1vd1pP9sOjnsdEKRENH1pNUF8mSqlIxNrbyaVmHceZMnE22JpgMU1uWMP IGGvuR4vtQV1xZVttpPI0vus7ZuDfpXdlKcQZo1JtZgIKfl0Pow3+aKVjrAqmpUTu1p4 ZWdlSnHNBni0pVowTTBeZTOOTzC6M+Bing8iI3+MDoMRst6qmXe+jlfAi3sGGWIFBwKB GpTwPFhYmuIcti7wrEtpHV9TqFDZMx7PydX3PMlQvt3ZMDJSfPS+DHwm+zYH1bVS3mcx 8bwQ== 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:user-agent; bh=wqOFMWe+mp3c8TorAc2H1VRjzI9RZ5AFH27KTf53AIk=; b=dhKF7iQyQHaT/ApkMc1jAtQFcZxFlcogSZXuYkvypFn7zzTG0HTBiEExvi5oRDK6ZS PSavJcg3aiYkOBzOPClenmJ2jMrfL7qjXcLHvnuu54evE/6gK6Cnie+tn3ZdAej2BhLv j4gAsYx+5hVPcHJt8mjMMeoPGHO1fzyKINwk+fgFzRUzgw0CIpy/+AkiPE0QfjoswnkV mfpVzok49K7p3AkdL+VaN6ffmscpXFC+iHJHS6GfGOaSMOKM6EObkBkvzm1Y3XRXaJ4w BREfEM6unJWNPO2YZOOYfYfNYJgtQgfRYnYgyo9cY8MU3bM8wcqLwUB0YIguhOxlaJuK yTDw== X-Gm-Message-State: APjAAAUV7HXLAtmNhnOtVljmsFr7Z4zbkkFJ5EQsvtyD/N/jgKma2aCb ++x0UALW+alvlgZrqdI1C/fimw== X-Google-Smtp-Source: APXvYqy30obyGgj4Ob6e1fIE+j/iQawI9EjPsp4eRg4ErWCrQv/NITI8BVWWy3/DmbtmMb5bkFZgRA== X-Received: by 2002:a05:6402:1549:: with SMTP id p9mr2126480edx.221.1569324953703; Tue, 24 Sep 2019 04:35:53 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id w21sm313594eda.90.2019.09.24.04.35.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 24 Sep 2019 04:35:52 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id 3FC7A1022A6; Tue, 24 Sep 2019 14:35:54 +0300 (+03) Date: Tue, 24 Sep 2019 14:35:54 +0300 From: "Kirill A. Shutemov" To: Vlastimil Babka Cc: linux-mm@kvack.org, Andrew Morton , linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Michal Hocko , Mel Gorman , Matthew Wilcox Subject: Re: [PATCH v2 3/4] mm, page_owner: keep owner info when freeing the page Message-ID: <20190924113554.azr3w3blo4h4ask2@box> References: <20190820131828.22684-1-vbabka@suse.cz> <20190820131828.22684-4-vbabka@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190820131828.22684-4-vbabka@suse.cz> User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 20, 2019 at 03:18:27PM +0200, Vlastimil Babka wrote: > For debugging purposes it might be useful to keep the owner info even after > page has been freed, and include it in e.g. dump_page() when detecting a bad > page state. For that, change the PAGE_EXT_OWNER flag meaning to "page owner > info has been set at least once" and add new PAGE_EXT_OWNER_ACTIVE for tracking > whether page is supposed to be currently tracked allocated or free. Why not PAGE_EXT_OWNER_ALLOCED if it means "allocated"? Active is somewhat loaded term for a page. -- Kirill A. Shutemov