Date: Thu, 15 Feb 2007 17:30:37 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Frank Ch. Eigler" <fche@redhat.com>, linux-kernel@vger.kernel.org,
       Christoph Hellwig <hch@infradead.org>, Ingo Molnar <mingo@redhat.com>,
       systemtap@sources.redhat.com, ltt-dev@shafik.org
Subject: Re: [PATCH 00/05] Linux Kernel Markers - kernel 2.6.20
Message-ID: <20070215223037.GA6297@Krystal>
References: <1171224207118-git-send-email-mathieu.desnoyers@polymtl.ca> <20070214231201.20918c6b.akpm@linux-foundation.org> <y0mvei330ee.fsf@ton.toronto.redhat.com> <20070215141841.6eed5fbb.akpm@linux-foundation.org>
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* Andrew Morton (akpm@linux-foundation.org) wrote:
> On 15 Feb 2007 10:28:57 -0500
> fche@redhat.com (Frank Ch. Eigler) wrote:
> 
> > 
> > akpm wrote:
> > 
> > > [...]  And what can I do with these markers?  And once I've done it,
> > > are there any userspace applications I can use to get the data out
> > > in human-usable form?  [...]
> > 
> > The LTTng user-space programs use it today.  Systemtap used to support
> > the earlier marker prototype and will be rapidly ported over to this
> > new API upon acceptance.
> > 
> 
> That's good.
> 
> It would be beneficial if some people from those projects could spare the
> cycles to carefully review and runtime test this code.
> 
LTTng is using the marker infrastructure since last november. Me and my
users have been very happy with it.

> Also, I'm not 100% clear on where we ended up with the huge
> static-vs-dynamic flamewar.  Did everyone end up happy?  Is this patchset a
> reasonable compromise?  Or do we need a rematch?

I think the final agreement was the need for some kind of code marking
system, which I tried to implement as best as I could. It gives very
good performances while tracing (advantage of static tracing), has a
very very minimal performance and binary size impact when disabled
(advantage of dynamic tracing) and it can be activated dynamically
(advantage of dynamic tracing).

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Candidate, ?cole Polytechnique de Montr?al
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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