linux-kernel - Re: [PATCH] 9p: remove CONFIG_NET_9P

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Date:	Wed, 10 Aug 2011 07:24:56 -0500
From:	Eric Van Hensbergen <ericvh@...il.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Alex Ray <alexjray.ncsu@...il.com>,
	v9fs-developer@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alex Ray <ajray@...u.edu>
Subject: Re: [PATCH] 9p: remove CONFIG_NET_9P_DEBUG option

On Wed, Aug 10, 2011 at 4:13 AM, Aneesh Kumar K.V
<aneesh.kumar@...ux.vnet.ibm.com> wrote:
>
> On Mon,  1 Aug 2011 07:14:44 -0500, Alex Ray <alexjray.ncsu@...il.com> wrote:
>> Remove the CONFIG_NET_9P_DEBUG option, used to completely remove logging
>> functionality from v9fs.  Logging is (already) controlled with the
>> run-time debug= option, this gets rid of the compile-time option (which
>> was being misunderstood and misused).
>>
>> Signed-off-by: Alex Ray <ajray@...u.edu>
>
> I see this merged to for-next.  Do we know whether enabling debug always have a
> performance impact ?.
>

No clue, but without any debug it makes it impossible for user's to
generate reasonable bug reports.  If I understand the tracepoint
collection facility correctly, it incurs exactly the same overhead as
a DPRINT when the debug mount option is set to 0 (although tracepoints
are much lower overhead when actually collecting).  Now, one could
make a case that we have too many DPRINT and need to cut back, but if
that's the case, let's just get around to it and cleanup a bit.

All that being said, I welcome anyone to send me performance with and
without CONFIG_NET_9P_DEBUG turned on to convince me differently.

        -eric
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