linux-kernel - Re: [PATCH net-next v4] xen-netback: Adding debugfs "io_ring

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Message-Id: <20140708.204915.1577238573149775056.davem@davemloft.net>
Date:	Tue, 08 Jul 2014 20:49:15 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	zoltan.kiss@...rix.com
Cc:	wei.liu2@...rix.com, Ian.Campbell@...rix.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH net-next v4] xen-netback: Adding debugfs "io_ring_qX"
 files

From: Zoltan Kiss <zoltan.kiss@...rix.com>
Date: Tue, 8 Jul 2014 19:49:14 +0100

> This patch adds debugfs capabilities to netback. There used to be a similar
> patch floating around for classic kernel, but it used procfs. It is based on a
> very similar blkback patch.
> It creates xen-netback/[vifname]/io_ring_q[queueno] files, reading them output
> various ring variables etc. Writing "kick" into it imitates an interrupt
> happened, it can be useful to check whether the ring is just stalled due to a
> missed interrupt.
> 
> Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>

Applied, but like others I consider those ifdefs hella ugly.

Provide stubs in an #else block, then you don't have to crap up the
main code.
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