linux-kernel - Re: [PATCH v2] DAX: enable iostat for read/write

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Date:   Mon, 17 Oct 2016 17:45:04 +0000
From:   "Kani, Toshimitsu" <toshi.kani@....com>
To:     "ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>
CC:     "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v2] DAX: enable iostat for read/write

On Mon, 2016-10-17 at 11:29 -0600, Ross Zwisler wrote:
> On Mon, Oct 17, 2016 at 11:18:58AM -0600, 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.
> > 
> > Signed-off-by: Toshi Kani <toshi.kani@....com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Alexander Viro <viro@...iv.linux.org.uk>
> > Cc: Dan Williams <dan.j.williams@...el.com>
> > Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
> > ---
> > v2:
> > - Set a minimum of one sector (Dan Williams)
> 
> What about Dave's feedback that this code just reimplements 
> generic_start_io_acct() and generic_end_io_acct()?

My bad. There was some issue in my email box and I just realized it.
Please disregard this version... 

Thanks,
-Toshi