linux-kernel - Re: [PATCH 2/2] dax: move writeback calls into the filesystems

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Date:	Mon, 08 Feb 2016 15:58:44 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Dave Chinner <david@...morbit.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	"linux-kernel\@vger.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\@lists.01.org" <linux-nvdimm@...1.01.org>,
	XFS Developers <xfs@....sgi.com>
Subject: Re: [PATCH 2/2] dax: move writeback calls into the filesystems

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?

-Jeff