linux-kernel - Re: [PATCH v5] DAX: enable iostat for read/write

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Date:   Wed, 25 Jan 2017 15:55:14 +0000
From:   "Kani, Toshimitsu" <toshi.kani@....com>
To:     "hch@...radead.org" <hch@...radead.org>,
        "jmoyer@...hat.com" <jmoyer@...hat.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "joe@...ches.com" <joe@...ches.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "david@...morbit.com" <david@...morbit.com>
Subject: Re: [PATCH v5] DAX: enable iostat for read/write

On Wed, 2017-01-25 at 10:15 -0500, Jeff Moyer wrote:
> Christoph Hellwig <hch@...radead.org> writes:
> 
> > On Thu, Jan 12, 2017 at 11:38:48AM -0700, Toshi Kani wrote:
> > > DAX IO path does not support iostat, but its metadata IO path
> > > does. Therefore, iostat shows metadata IO statistics only, which
> > > has been confusing to users.
> > > 
> > > Add iostat support to the DAX read/write path.
> > > 
> > > Note, iostat still does not support the DAX mmap path as it
> > > allows user applications to access directly.
> > 
> > NAK.  DAX I/O should not be accounted for block device statistics.
> 
> Agreed, this is a layering violation.

I will check to see if it can fit on top of Dan's patch-set.

Thanks,
-Toshi