linux-kernel - RE: [V2 6/7] hvsock: introduce Hyper-V VM Sockets feature

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Date:	Mon, 20 Jul 2015 05:30:50 +0000
From:	Dexuan Cui <decui@...rosoft.com>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>
CC:	David Miller <davem@...emloft.net>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"pebolle@...cali.nl" <pebolle@...cali.nl>
Subject: RE: [V2 6/7] hvsock: introduce Hyper-V VM Sockets feature

> -----Original Message-----
> From: Vitaly Kuznetsov
> Sent: Friday, July 17, 2015 23:04
> To: Dexuan Cui
> Dexuan Cui writes:
> 
> >> From: David Miller
> >> Sent: Thursday, July 16, 2015 12:19
> >>
> >> From: Dexuan Cui
> >> Date: Tue, 14 Jul 2015 03:00:48 -0700
> >>
> >> > +	pr_debug("hvsock_sk_destruct: called\n");
> >>
> >> Debug logging just to state that a function is called is not appropriate,
> >> we have very sophisticated tracing facilities in the kernel that can do
> >> that transparently, and more.
> >>
> >> Please remove this.
> > OK.
> >
> >> > +	if (hvsk->channel) {
> >> > +		pr_debug("hvsock_sk_destruct: calling vmbus_close()\n");
> >>
> >> Likewise, these kinds of debug logs are totally inappropriate.
> > OK, I'll remove all the pr_debug() in the patch.
> >
> 
> I'd suggest we rather use something like net_dbg_ratelimited()
> intead. The driver is new so issues are expected. Some debugging may
> be useful)
> 
>   Vitaly

The net_*ratelimited() functions may lose message if the messages are
printed very frequently, like in hvsock_sendmsg()/hvsock_recvmsg().

I used pr_debug() because I saw it's widely used in net/ipv4/.
Usually CONFIG_DYNAMIC_DEBUG=y, so pr_debug() means 
dynamic_pr_debug(), which won't output anything by default.

Sorry, I'm not sure about the "sophisticated tracing facilities in the
kernel that can do that transparently, and more" mentioned by David.

Anyway, I don't mind  simply removing the pr_debug() usages.
I will send out V3 later today.

Thanks,
-- Dexuan
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