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List:       opensolaris-dtrace-discuss
Subject:    Re: [dtrace-discuss] Can't print stack traces if printa has a
From:       Ryan Johnson <ryanjohn () ece ! cmu ! edu>
Date:       2009-07-13 17:00:10
Message-ID: 4A5B681A.2000301 () ece ! cmu ! edu
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Ryan Johnson wrote:
> Is there a way to print stack traces as part of an aggregation key in 
> dtrace? I'm trying to count occurrences of different stack traces, but 
> my program has lots of indirect function calls and the output of 
> stack() often doesn't contain the current function. Aggregating on 
> @who[caller,stack()] should fix this in theory, but I can't get the 
> printing to work right.
Ah! Turns out this question was already asked in 2005, and the answer is 
"%k"
> On a related note, it seems that "%A" can translate user-level 
> addresses to symbols in a printf/printa, which is not documented 
> AFAICT and has caused me pain in the past (see 
> http://kr.sun.com/developers/solaris/techdocs/dtrace_tips_public.pdf)
I've updated the printf/printa wiki page to mention both %A and %k.

Ryan

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