From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 777C1211BFCC5 for ; Fri, 8 Feb 2019 01:02:48 -0800 (PST) Date: Fri, 8 Feb 2019 10:02:45 +0100 From: Johannes Thumshirn Subject: Re: [LSF/MM TOPIC] The end of the DAX experiment Message-ID: <20190208090245.GA8038@linux-x5ow.site> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: "Kani, Toshi" Cc: "linux-ext4@vger.kernel.org" , "linux-nvdimm@lists.01.org" , "linux-kernel@vger.kernel.org" , "linux-xfs@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "lsf-pc@lists.linux-foundation.org" List-ID: On 07/02/2019 22:51, Kani, Toshi wrote: > I've also had multiple users complained about 'mount -o dax' succeeded > by falling back to non-dax despite of their intent. Such users wasted > many hours without knowing their setup error / current restrictions. > The next think they always ask is how to check if dax is enabled in such > case, and they are not happy about limited interfaces (ex. look for > mount entry in /proc/mounts), either. Exactly, there's a need for admins and user-space applications to check if = they can use DAX or not. See also [1] for reference. > Same as above. Such enhancement should be possible after EXPERIMENTAL > is removed from 'mount -o dax'. IOW, a separate EXPERIMENTAL message > can be shown when user requests per-directory dax. Just as a data point here, in our Kernels we've removed the EXPERIMENTAL warning for DAX on XFS (but not EXT4) and we are supporting it for some lim= ited use-cases. [1] https://lore.kernel.org/linux-fsdevel/20181002100531.GC4135@quack2.suse= .cz/ Byte, Johannes -- = Johannes Thumshirn SUSE Labs Filesystems jthumshirn@suse.de +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: Felix Imend=F6rffer, Jane Smithard, Graham Norton HRB 21284 (AG N=FCrnberg) Key fingerprint =3D EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm