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Date:      Sun, 05 Dec 2010 00:43:06 +0200
From:      Andriy Gapon <avg@freebsd.org>
To:        Zhihao Yuan <lichray@gmail.com>
Cc:        Brandon Gooch <jamesbrandongooch@gmail.com>, freebsd-stable@freebsd.org, Navdeep Parhar <nparhar@gmail.com>, Jeremy Chadwick <freebsd@jdc.parodius.com>
Subject:   Re: Fwd: Re: Fail to use Dtrace on FreeBSD 8.1-STABLE
Message-ID:  <4CFAC3FA.9050601@freebsd.org>
In-Reply-To: <AANLkTinQ6j-fBvQsKAn-NwkR_LJUSesTYp75cM-KB3VV@mail.gmail.com>
References:  <20101123131353.GA7243@icarus.home.lan>	<20101123132519.GA1426@icarus.home.lan>	<4CEBC155.9090706@freebsd.org>	<AANLkTimsa-YM6B_272U4gjZzt1Ce05LR4sQTz_AiHJCU@mail.gmail.com>	<AANLkTimb-Kijj_%2BQ2%2BxKrjtP65Zx%2BJ7rUjEP4i0HZyu6@mail.gmail.com>	<20101202002734.GA84177@icarus.home.lan>	<AANLkTikcHwXWGz-hcpJfZ_cM73pgHKPgCm3bApf94gwE@mail.gmail.com>	<AANLkTinReeg3Xr6=553jwp5jfHuZppOd%2B0v1DC_rAEQC@mail.gmail.com>	<AANLkTi=-A2eJ7vNHUJGxViMEW%2BcGpzJ8g1vJe0d9B48E@mail.gmail.com>	<AANLkTi=vp0UNuemjKJimTRMd35NxeADZ2-%2B0qLVG%2BKWJ@mail.gmail.com>	<20101202022416.GA86118@icarus.home.lan>	<4CF8FDC8.7050702@freebsd.org>	<AANLkTimW-z%2B0GuUz8bQ33Le_JrYVChiSJ6r7b=r64gJQ@mail.gmail.com>	<4CF97D6A.7020900@freebsd.org>	<AANLkTikdsso-sw%2BC_pMGy%2BWjhLjp4G-6QOxHpyVE2i-6@mail.gmail.com>	<4CFA23A7.3050604@freebsd.org> <AANLkTinQ6j-fBvQsKAn-NwkR_LJUSesTYp75cM-KB3VV@mail.gmail.com>

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on 05/12/2010 00:23 Zhihao Yuan said the following:
> HAHAHAHA!  It matters.... Not KBD, not DDB, only the DEBUG=-g option. It seems
> like DTrace requires the symbols inside a kernel/program. Well, now my DTrace
> works perfectly, and the examples on the wiki also work. The next step is to try
> to use it to trace my program. SDT may help. I need to learn more. Thanks guys...

Interesting, thank you very much for the investigation and report!
And your persistence too! :)

I will try to find time to investigate why this requirement has arisen or if it
has always been present, just not documented.
If it can be removed, then good; otherwise I will update the documentation at least.

-- 
Andriy Gapon



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