Hi all,
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.
printa(@who) shows the stack but just an address for caller, and neither
%a nor %s allows me to print a stack trace if I give printa a format string:
printa("%40a %40s %...@d", @who)
dtrace: failed to compile script who.d: line 30: printa( ) argument #3
is incompatible with conversion #2 prototype:
conversion: %s
prototype: char [] or string (or use stringof)
argument: stack
printa("%40a %40a %...@d", @who)
dtrace: failed to compile script who.d: line 30: printa( ) argument #3
is incompatible with conversion #2 prototype:
conversion: %a
prototype: pointer or integer
argument: stack
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)
Ideas?
Ryan
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