From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50A2739FEB; Fri, 4 Oct 2024 06:27:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.95.11.211 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728023262; cv=none; b=nmqETn10xyruo1MJRJ0SBTCJkuDI1D+zJ3qPFkW5vl9TiuRL6Sx3uuhfiENJ4Dk0gjrndDv0qbG9IFuL88FjuhhKrxalRw2DbzUjOs5YarIhpnawPLjyw3gVkK6q2vnO1vpGXcdYNhqkzglNf6cgwDr9YpvIjqzyssd0D4DMFP4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728023262; c=relaxed/simple; bh=rqozs4HW6OYSXLAUVOBTDFuUNhs8rZVJzE5B+05LPGc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=S72/k8qcFhguYVbM4KfKnHDJBK+uRaxAegXK4Z/okiKmHAAenNlCQoog7tD+m2e8EEk52lp6fRClVZGDHe099OZhl3EiEt6sRdK9l/IRf+ER0ntppT2OfMdJJn2YjTZuZie6UYd5pPe0nRHCutIBAa1/uGuVNihEv3Aq883A0gk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=pass smtp.mailfrom=lst.de; arc=none smtp.client-ip=213.95.11.211 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lst.de Received: by verein.lst.de (Postfix, from userid 2407) id F1B57227A87; Fri, 4 Oct 2024 08:27:33 +0200 (CEST) Date: Fri, 4 Oct 2024 08:27:33 +0200 From: Christoph Hellwig To: Javier =?iso-8859-1?Q?Gonz=E1lez?= Cc: Christoph Hellwig , Jens Axboe , "Martin K. Petersen" , Keith Busch , Kanchan Joshi , hare@suse.de, sagi@grimberg.me, brauner@kernel.org, viro@zeniv.linux.org.uk, jack@suse.cz, jaegeuk@kernel.org, bcrl@kvack.org, dhowells@redhat.com, bvanassche@acm.org, asml.silence@gmail.com, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, linux-block@vger.kernel.org, linux-aio@kvack.org, gost.dev@samsung.com, vishak.g@samsung.com Subject: Re: [PATCH v7 0/3] FDP and per-io hints Message-ID: <20241004062733.GB14876@lst.de> References: <20241002151344.GA20364@lst.de> <20241002151949.GA20877@lst.de> <20241003125400.GB17031@lst.de> <20241004053121.GB14265@lst.de> <20241004061811.hxhzj4n2juqaws7d@ArmHalley.local> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20241004061811.hxhzj4n2juqaws7d@ArmHalley.local> User-Agent: Mutt/1.5.17 (2007-11-01) On Fri, Oct 04, 2024 at 08:18:11AM +0200, Javier González wrote: >> And for anyone who followed the previous discussions of the patches >> none of this should been new, each point has been made at least three >> times before. > > Looking at the work you and Hans have been doing on XFS, it seems you > have been successful at mapping the semantics of the temperature to > zones (which has no semantics, just as FDP). > > What is the difference between the mapping in zones and for FDP? Probably not much, except for all the pitfalls in the FDP not quite hint not madatory design. > The whole point is using an existing interface to cover the use-case of > people wanting hints in block. And that's fine. And that point all the way back for month is that doing a complete dumb mapping in the driver for that is fundamentally wrong. Kanchan's previous series did about 50% of the work to get it rid, but then everyone dropped dead and played politics.