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

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Message-ID: <20170125111952.GA11978@infradead.org>
Date:   Wed, 25 Jan 2017 03:19:52 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Toshi Kani <toshi.kani@....com>
Cc:     akpm@...ux-foundation.org, dan.j.williams@...el.com,
        linux-nvdimm@...ts.01.org, david@...morbit.com,
        linux-kernel@...r.kernel.org, Joe Perches <joe@...ches.com>,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v5] DAX: enable iostat for read/write

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.