This sounds like it could be the start of some kick-ass GNOME performance work. Dtrace ftw 
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on Wednesday, December 16th, 2009 at 4:44 pm and is filed under GNOME, OpenSolaris, Sun.
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Nice! This should really work as is with Systemtap also. Systemtap provides dtrace compatible static user probes for GNU/Linux.
http://sourceware.org/systemtap/wiki/AddingUserSpaceProbingToApps
So this work doesn’t have to be solaris/dtrace specific. I reused some of the usdt markers in java and python for example and they work pretty nicely.
http://gnu.wildebeest.org/diary/2009/08/06/i-love-it-when-a-plan-comes-together-systemtap-meets-java/
http://gnu.wildebeest.org/diary/2009/12/07/fudcon-success-systemtap-meets-python/