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=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 87A0CC433E2 for ; Tue, 8 Sep 2020 09:25:16 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 29C9221741 for ; Tue, 8 Sep 2020 09:25:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="AgmBxuga" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 29C9221741 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=M4zIeDXcGOJDp+M18U8SoUWksaEXDsXjDdYn4DJ46ao=; b=AgmBxugauvntEyhkNRbOQVrqB 8ZHlHs8dEs7W3fcu0torlqa5U/9X4ZJBiMenberu0d7if8GxM7gtB2feq1vxO1ixF4dVkZDn5y013 L0Fuzau1K8CG0x7ZHaAhompDIKLZNyFZ5XkWxWmRXnfVBheqqr0AD4p+WatrZ4nU+6cVq+Y2Bsfnv hObglKTkYW1lwalKaqAmDO0mZrWEAVWCw/LiVJNPSe5IccQTAeLEUhuFmpAtwmG4Xso6ABOcHZmb6 U63H7enqmHaHfFtXrYY02XWFkKofNC/lvvCGraRQemwMgjKLLKpaj548EB/vQ8TkDbQu3Fb87wFg6 Acu5vEagw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kFZr9-0008BB-Dp; Tue, 08 Sep 2020 09:24:03 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kFZr6-0008AY-Ix for linux-arm-kernel@lists.infradead.org; Tue, 08 Sep 2020 09:24:01 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C2CC71045; Tue, 8 Sep 2020 02:23:58 -0700 (PDT) Received: from [10.163.71.211] (unknown [10.163.71.211]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3F4173F66E; Tue, 8 Sep 2020 02:23:55 -0700 (PDT) Subject: Re: [PATCH V2] arm64/hotplug: Improve memory offline event notifier To: linux-arm-kernel@lists.infradead.org References: <1598241869-28416-1-git-send-email-anshuman.khandual@arm.com> From: Anshuman Khandual Message-ID: Date: Tue, 8 Sep 2020 14:53:23 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <1598241869-28416-1-git-send-email-anshuman.khandual@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200908_052400_685765_7DAA6D4C X-CRM114-Status: GOOD ( 19.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Steve Capper , Catalin Marinas , linux-kernel@vger.kernel.org, Mark Brown , Marc Zyngier , Will Deacon Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 08/24/2020 09:34 AM, Anshuman Khandual wrote: > This brings about three different changes to the sole memory event notifier > for arm64 platform and improves it's robustness while also enhancing debug > capabilities during potential memory offlining error conditions. > > This moves the memory notifier registration bit earlier in the boot process > from device_initcall() to setup_arch() which will help in guarding against > potential early boot memory offline requests. > > This enables MEM_OFFLINE memory event handling. It will help intercept any > possible error condition such as if boot memory some how still got offlined > even after an expilicit notifier failure, potentially by a future change in > generic hotplug framework. This would help detect such scenarious and help > debug further. > > It also adds a validation function which scans entire boot memory and makes > sure that early memory sections are online. This check is essential for the > memory notifier to work properly as it cannot prevent boot memory offlining > if they are not online to begin with. But this additional sanity check is > enabled only with DEBUG_VM. > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Mark Rutland > Cc: Marc Zyngier > Cc: Steve Capper > Cc: Mark Brown > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual > --- > This applies on 5.9-rc2 > > Changes in V2: > > - Dropped all generic changes wrt MEM_CANCEL_OFFLINE reasons enumeration > - Dropped all related (processing MEM_CANCEL_OFFLINE reasons) changes on arm64 > - Added validate_boot_mem_online_state() that gets called with early_initcall() > - Added CONFIG_MEMORY_HOTREMOVE check before registering memory notifier > - Moved notifier registration i.e memory_hotremove_notifier into setup_arch() Gentle ping, any updates on this ? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel