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[2620:137:e000::3:3]) by mx.google.com with ESMTPS id c25-20020a056830349900b006d811845727si2274914otu.30.2023.11.27.06.18.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Nov 2023 06:18:29 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=B48zSKFv; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by lipwig.vger.email (Postfix) with ESMTP id 49798809ADEE; Mon, 27 Nov 2023 06:18:24 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at lipwig.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233239AbjK0ORu (ORCPT + 99 others); Mon, 27 Nov 2023 09:17:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56812 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233635AbjK0OR1 (ORCPT ); Mon, 27 Nov 2023 09:17:27 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B58BC131 for ; Mon, 27 Nov 2023 06:09:36 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4281C433CC; Mon, 27 Nov 2023 14:09:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701094176; bh=Rzm1pffWSXspIZnYman5Fq3ZA6DmRbWYR/wrDSYJOAw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=B48zSKFvCfDTu1F6pwsZ2SDK5DH8Cd9q7yYg1pMzuqVQ9ycLZ/kL5GunnlGuWLvZg LkLwo6oEmtk8t+hImaDCKhVzLLttkkQjD5tYCGJsAxSu2Gtk1DXlKrioF09SdTc+Jx rlcRGYrBPtFa8M4iRVu1223CXUj4Qd7vj6mckhQSuRiKjpt+hDD6FLEanWigKEPA2H p9YSSW6pe471F28DrI1iYQhrOYdvAlpRsqJKmJxCKc/JMhFgKnWItIf8KPYjmqVYe/ Cocqlv3gx+14BMCGx2b/pSPAY+piCErvLWUd7haF/kgPP8FLc/dUdEmCjf6aS/EjrN S94trnx9DxVog== Date: Mon, 27 Nov 2023 14:09:33 +0000 From: Mark Brown To: Ferry Toth Cc: Greg Kroah-Hartman , Oleksij Rempel , "Rafael J. Wysocki" , Ulf Hansson , kernel@pengutronix.de, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-pm@vger.kernel.org, =?iso-8859-1?Q?S=F8ren?= Andersen Subject: Re: [PATCH v1 0/3] introduce priority-based shutdown support Message-ID: References: <20231124185725.GA872366@pengutronix.de> <2023112520-paper-image-ef5d@gregkh> <20231125085038.GA877872@pengutronix.de> <2023112506-unselfish-unkind-adcb@gregkh> <2023112541-uptown-tripping-05f3@gregkh> <2023112504-cathedral-pulmonary-83ce@gregkh> <56823ff4-69fa-4c92-8912-51fbfd71403a@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="WNnJnhr0Ry+xKVz2" Content-Disposition: inline In-Reply-To: <56823ff4-69fa-4c92-8912-51fbfd71403a@gmail.com> X-Cookie: Slow day. Practice crawling. X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Mon, 27 Nov 2023 06:18:24 -0800 (PST) --WNnJnhr0Ry+xKVz2 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sun, Nov 26, 2023 at 08:42:02PM +0100, Ferry Toth wrote: > Funny discussion. As a hardware engineer (with no experience in automotive, > but actual experience in industrial applications and debugging issues > arising from bad shutdowns) let me add my 5ct at the end. I suspect there's also a space here beyond systems that were designed with these failure modes in mind where people run into issues once they have the hardware and are trying to improve what they can after the fact. > Now, we do need to keep in mind that storing J in a supercap, executing a > CPU at GHz, storing GB data do not come free. So, after making sure things > shutdown in time, it often pays off to shorten that deadline, and indeed > make it faster. 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