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

[Kani, Toshimitsu]

On Wed, 2017-01-25 at 10:15 -0500, Jeff Moyer wrote:
> Christoph Hellwig <hch@xxxxxxxxxxxxx> 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.ÂÂDAX 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