On Mon, Oct 20, 2008 at 11:39 PM, michael schuster <[EMAIL PROTECTED]> wrote: > Yasufumi CHIDA wrote: >> Hello, super dtrace masters, >> >> When I use Dscripts in which ustack() is involved, >> it sometimes output the stacktrace with their names of the functions, >> but sometime not. >> >> I'm confused because of these inconsistent results. >> Does anyone know this reason? > > most likely, you're seeing the effects of aynchronous post-processing of an > event: data is recorded when the probe fires, but only post-processed > (converting adresses to names, among other things) later. If the process > under inspection has gone away by the time post-processing happens, there's > nothing to get the names from, and all you see is addresses.
Actually, could you give a little more detail? (Yasufumi, not Michael.) Specifically, are you getting inconsistent results from the same process or program? Or are you getting inconsistent results from different processes/programs? If it's the former, then Michael's answer makes sense. If it's the latter, then it may be simpler than that -- some of the processes may be stripped, in which case you'd have no symbol data to use for translating function addresses. Chad _______________________________________________ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
