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Date: Mon, 8 Feb 2016 14:05:34 -0800 From: Dan Williams <dan.j.williams@...el.com> To: Jeff Moyer <jmoyer@...hat.com> Cc: Dave Chinner <david@...morbit.com>, Ross Zwisler <ross.zwisler@...ux.intel.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Theodore Ts'o" <tytso@....edu>, Alexander Viro <viro@...iv.linux.org.uk>, Andreas Dilger <adilger.kernel@...ger.ca>, Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.com>, Matthew Wilcox <willy@...ux.intel.com>, linux-ext4 <linux-ext4@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Linux MM <linux-mm@...ck.org>, "linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>, XFS Developers <xfs@....sgi.com> Subject: Re: [PATCH 2/2] dax: move writeback calls into the filesystems On Mon, Feb 8, 2016 at 12:58 PM, Jeff Moyer <jmoyer@...hat.com> wrote: > Dan Williams <dan.j.williams@...el.com> writes: > >> I agree the mount option needs to die, and I fully grok the reasoning. >> What I'm concerned with is that a system using fully-DAX-aware >> applications is forced to incur the overhead of maintaining *sync >> semantics, periodic sync(2) in particular, even if it is not relying >> on those semantics. >> >> However, like I said in my other mail, we can solve that with >> alternate interfaces to persistent memory if that becomes an issue and >> not require that "disable *sync" capability to come through DAX. > > What do you envision these alternate interfaces looking like? Well, plan-A was making DAX be explicit opt-in for applications, I haven't thought too much about plan-B. I expect it to be driven by real performance numbers and application use cases once the *sync compat work completes. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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