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 19CECC369A8 for ; Thu, 10 Apr 2025 11:16:32 +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=h4jugw2842L8FhrzoYhpukdsAftq2C3LkIR7a4jbZG0=; b=DIs4xo7kZDqI5isRcoc+otH3Np VqWPsfnVRLSa1jfDTNrtPX8JhYQNrFfF06E9y0jFH6YDuFDWJwADxo1t6+M21in09GQTpDy20kwhe gvzjkAC3yIx3+aOvZHIcDLOhGdioz+qfO0sRDgDgTx6KZb3Tx+ySvDfUwc9+aKRweMlZnRWMR7KGr vlnOcPsvZyr4bd1l3KViwpSZOyt+Inv6K39uAlmxt3ZnL6fSco9xT8dPB6+o7nzt89GR9BEbzUPcT UuCElkDNfEAqiBk4NvixjByUYymYyE/6DmNXCjcZc8KC5TIFWeiSkxOvCvVikUArq3gADXNPwGzB1 wEim6Z9Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u2ptW-0000000ACIq-2D0j; Thu, 10 Apr 2025 11:16:30 +0000 Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1u2o2o-00000009uRM-2sbo; Thu, 10 Apr 2025 09:17:58 +0000 Date: Thu, 10 Apr 2025 02:17:58 -0700 From: Christoph Hellwig To: Keith Busch Cc: Christoph Hellwig , Chaitanya Kulkarni , "alan.adamson@oracle.com" , "linux-nvme@lists.infradead.org" Subject: Re: Issue with AWUPF when using multiple controllers in a subsystem Message-ID: References: <4a2e4561-9311-40c9-aa65-87e7a2e5b041@oracle.com> <23d2c5c3-0832-4b62-a151-74a021c63201@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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, Apr 10, 2025 at 10:07:22AM +0100, Keith Busch wrote: > You'll get different results depending on the non-deterministic order we > enumerate. Can't we just change the stacked limit to the smallest > observed value as we go? That means discovering a new controller could lower the limit while a file system is using it. Not a good idea. That's why I suggested only supporting the namespace variant ASAP until we actually grow users relying on it.