linux-kernel - Re: [PATCH 2/7] dynamic debug v2

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Message-Id: <20080715162441.4aa011e0.akpm@linux-foundation.org>
Date:	Tue, 15 Jul 2008 16:24:41 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	jbaron@...hat.com, linux-kernel@...r.kernel.org, joe@...ches.com,
	greg@...ah.com, nick@...k-andrew.net, randy.dunlap@...cle.com
Subject: Re: [PATCH 2/7] dynamic debug v2 - nfs conversion

On Tue, 15 Jul 2008 19:15:45 -0400
Trond Myklebust <trond.myklebust@....uio.no> wrote:

> On Tue, 2008-07-15 at 18:56 -0400, Trond Myklebust wrote:
> 
> > The point is that he is changing a semi-official interface for tracing
> > the NFS kernel activity from userspace. I'd like to know why and how it
> > is being modified before I can ack it.
> > 
> > In addition there are several other developers who have a daily interest
> > in using this interface when helping our users, and who might have
> > comments.
> 
> OK. Having looked up the missing patch on gmane, I'd like to know
> whether or not there is a followup plan to fix up utilities like
> 'rpcdebug'? Apparently this patch doesn't remove the existing sunrpc
> sysctl interface, but does circumvent it. The result is that while
> rpcdebug will happily continue to run, it just won't work any more...
> 

I'm suspecting that Jason chose the wrong starter subsystem here ;)
Probably we should have started with the many hundreds of simpler
cases.

OTOH, it's important that Jason understand NFS's requirements here. 
Treat it as a testcase for his design.  Will his infrastructure be
usable by NFS?  If not, does his infrastructure need generalising and
strengthening so that it _does_ suit?

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