linux-kernel - Re: frame unwinder patches

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Message-ID: <20080904102936.28e10c39@infradead.org>
Date:	Thu, 4 Sep 2008 10:29:36 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Bernd Schubert <bs@...eap.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: frame unwinder patches

On Thu, 04 Sep 2008 18:46:52 +0200
Bernd Schubert <bs@...eap.de> wrote:

> Hello,
> 
> up to 2.6.22 the -mm series had these nice frame unwinder patches, 
> which gave beautiful stack traces. Unfortunately these frame unwinder
> patches seem to have been dropped :(
> 
> Anyone still maintaining updated patches?
> 
> Probably all the "?" lines shouldn't be printed.

printing the ? lines is the result of a compromise between getting the
most reliable information out of a stack trace, and getting a useful
data for the case where not everything is going as well as it should.

not printing the ? would be trivial (for some backtraces we do that),
but so far hasn't been seen as desirable because you lose information
in those hard-to-debug cases when you need anything you can get from
the backtrace.


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