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

To: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: Re: [PATCH 2/2] dax: move writeback calls into the filesystems
From: Jeff Moyer <jmoyer@xxxxxxxxxx>
Date: Mon, 08 Feb 2016 15:58:44 -0500
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>, "linux-kernel\@vger.kernel.org" <linux-kernel@xxxxxxxxxxxxxxx>, "Theodore Ts'o" <tytso@xxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Andreas Dilger <adilger.kernel@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxxxx>, linux-ext4 <linux-ext4@xxxxxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, Linux MM <linux-mm@xxxxxxxxx>, "linux-nvdimm\@lists.01.org" <linux-nvdimm@xxxxxxxxxxx>, XFS Developers <xfs@xxxxxxxxxxx>
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In-reply-to: <CAPcyv4iHi17pv_VC=WgEP4_GgN9OvSr8xbw1bvbEFMiQ83GbWw@xxxxxxxxxxxxxx> (Dan Williams's message of "Mon, 8 Feb 2016 12:55:24 -0800")
References: <1454829553-29499-1-git-send-email-ross.zwisler@xxxxxxxxxxxxxxx> <1454829553-29499-3-git-send-email-ross.zwisler@xxxxxxxxxxxxxxx> <CAPcyv4jT=yAb2_yLfMGqV1SdbQwoWQj7joroeJGAJAcjsMY_oQ@xxxxxxxxxxxxxx> <20160207215047.GJ31407@dastard> <CAPcyv4jNmdm-ATTBaLLLzBT+RXJ0YrxxXLYZ=T7xUgEJ8PaSKw@xxxxxxxxxxxxxx> <20160208201808.GK27429@dastard> <CAPcyv4iHi17pv_VC=WgEP4_GgN9OvSr8xbw1bvbEFMiQ83GbWw@xxxxxxxxxxxxxx>
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Dan Williams <dan.j.williams@xxxxxxxxx> 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

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