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=-7.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,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 F1F6EC433DF for ; Mon, 24 Aug 2020 04:11:29 +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 BABCB20768 for ; Mon, 24 Aug 2020 04:11:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="s2HLxCuM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BABCB20768 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=f2ySiyZkn86xBZRl787++J/Gc+qiQ+lsT2Tii8EJng4=; b=s2HLxCuMLX4vwXcNYMMJRLk31 ce7cwVqC4sJYh4l2uS9F3mHHkojyxDTH4Y/Rsa5XXcpgmt+G3NLDf81jwH5eroWLtIlkdejdpkqNR zzDYjbRtJaMzcS9PeQopc7VNJwZYVrXDFVK+su1qpve0mpNh2LRI4mPHPqAD0VR/O8piaNg/zl9Vl rVzwFLQNjjFTkHvn5LOakLKXNnAJ7IHD/5YyAJ/VwH43URpIw04trvimTxlz0l1By9dbegI6o7sqS YI6hJqeEQ/Ek68zA8TZT5Syb2i/mu3bWpLibVePxAxwGDkKLgQSUdwSc/657kaTeB9A2auyeKNL2f H8VjDly9w==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kA3o6-0003la-8D; Mon, 24 Aug 2020 04:10:06 +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 1kA3o3-0003lB-SV for linux-arm-kernel@lists.infradead.org; Mon, 24 Aug 2020 04:10:04 +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 BB4231063; Sun, 23 Aug 2020 21:10:00 -0700 (PDT) Received: from [10.163.67.29] (unknown [10.163.67.29]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D58BE3F66B; Sun, 23 Aug 2020 21:09:57 -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: <15c8debd-b388-ec75-742f-5401a5546db4@arm.com> Date: Mon, 24 Aug 2020 09:39:25 +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-20200824_001004_118476_A20A1294 X-CRM114-Status: GOOD ( 16.93 ) 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 , Will Deacon , 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 Wrong email address here for Will. + Will Deacon s/will@kernel.com/will@kernel.org next time around. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel