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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DA699C433F5 for ; Thu, 10 Mar 2022 14:21:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=iQxIB7QH0VxqWxMly9wWD8lldbF8WlQitLmdYg/Ud74=; b=MdvmFH/0AXFXvOaa8CKG2vnvfZ ZHzPF2Q0YSTgPKbB2krhG5LuUtWuAx4EduZAqtj/XR0eb5D9JrWSDvop7B/Qxp7i52TTpSPRYwtUW HWB7qnOi9Sys6kppWLdStpeMA0qCEZKYJbVvHkSjfeVPfxFIQCREHd2e/M5QVuC3GpfjBlzXNWrfu RfGPfBfdeIT85UDrMj/O5I7T8gkpQVFDhH8yViUYsgM+bSTqSWkr0I+872Bk6IgIJYxrxxsYiRNRQ Gqo1cK2AGwo3Vjb93Qx5oF5fvxBKrMEz+j2X4AtMvc3AIDqX1gc1ITJJG/4tA7uiB0fbrifCNcbBD SwvWOgWQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nSJft-00D3zX-Kk; Thu, 10 Mar 2022 14:21:53 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nSJfq-00D3yN-Vr for linux-nvme@lists.infradead.org; Thu, 10 Mar 2022 14:21:52 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 2E2F968AFE; Thu, 10 Mar 2022 15:21:48 +0100 (CET) Date: Thu, 10 Mar 2022 15:21:48 +0100 From: "hch@lst.de" To: "Luca Porzio (lporzio)" Cc: Manjong Lee , "david@fromorbit.com" , "axboe@kernel.dk" , "hch@lst.de" , "kbusch@kernel.org" , "linux-block@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "linux-raid@vger.kernel.org" , "sagi@grimberg.me" , "song@kernel.org" , "seunghwan.hyun@samsung.com" , "sookwan7.kim@samsung.com" , "nanich.lee@samsung.com" , "woosung2.lee@samsung.com" , "yt0928.kim@samsung.com" , "junho89.kim@samsung.com" , "jisoo2146.oh@samsung.com" Subject: Re: [EXT] Re: [PATCH 2/2] block: remove the per-bio/request write hint. Message-ID: <20220310142148.GA1069@lst.de> References: <20220306231727.GP3927073@dread.disaster.area> <20220309133119.6915-1-mj0123.lee@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220310_062151_209950_DA645BDF X-CRM114-Status: GOOD ( 11.23 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Thu, Mar 10, 2022 at 11:34:40AM +0000, Luca Porzio (lporzio) wrote: > I work for Micron UFS team. I confirm and support Manjong message above. > There are UFS customers using custom write_hint in Android and due to the > "upstream first" policy from Google, if you remove write_hints in block device, > The Android ecosystem will suffer this lack. > > Can we revert back this decision? Or think of an alternative solution which > may work? Hell no. Given that these custmomers never gave a singe fuck to actually support whatever crap they came up with upstream we're not going to leave dead code to encurage them to keep doing this.