linux-kernel - Re: [PATCH V2 4/4] Drivers: hv: vmbus: Expose per-channel event counters events counters

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Date:   Mon, 18 Sep 2017 15:59:33 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     kys@...rosoft.com
Cc:     linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
        jasowang@...hat.com, leann.ogasawara@...onical.com,
        marcelo.cerri@...onical.com, sthemmin@...rosoft.com
Subject: Re: [PATCH V2 4/4] Drivers: hv: vmbus: Expose per-channel event
 counters events counters

On Sun, Sep 17, 2017 at 08:54:19PM -0700, kys@...hange.microsoft.com wrote:
> From: Stephen Hemminger <stephen@...workplumber.org>
> 
> When investigating performance, it is useful to be able to look at
> the number of host and guest events per-channel. This is equivalent
> to per-device interrupt statistics.
> 
> Signed-off-by: Stephen Hemminger <sthemmin@...rosoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> ---
>  Documentation/ABI/stable/sysfs-bus-vmbus | 14 ++++++++++++++
>  drivers/hv/connection.c                  |  2 ++
>  drivers/hv/vmbus_drv.c                   | 18 ++++++++++++++++++
>  include/linux/hyperv.h                   |  4 ++++
>  4 files changed, 38 insertions(+)

How is this a fix and not just a new feature?