Date: Mon, 4 Nov 2013 09:11:05 -0500 From: Mark Johnston <markj@freebsd.org> To: John Luk <john.37@gmail.com> Cc: freebsd-dtrace@freebsd.org Subject: Re: dtrace showed matched probes but nothing in output on FreeBSD 9.1-RELEASE Message-ID: <20131104141105.GE8007@raichu> In-Reply-To: <CAHkCX6iT2MKMRwQDQrWLLjMXx9kiiYneT4J_qirxn1EwshmGng@mail.gmail.com> References: <CAHkCX6j1H4cxeb255gdH_cLop5Lv0xJABbuma%2B835gNNq-Nshg@mail.gmail.com> <20131103235936.GB15661@raichu> <CAHkCX6g1jUirMDP4T7W%2BrP6P8JV5wF-Wsa984op_HP1WftSitA@mail.gmail.com> <20131104043519.GB8007@raichu> <CAHkCX6h312PJvukGo_MNowNpENDLT=hvmXymZRsDFW%2BtzYNPug@mail.gmail.com> <CAHkCX6iT2MKMRwQDQrWLLjMXx9kiiYneT4J_qirxn1EwshmGng@mail.gmail.com>
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On Mon, Nov 04, 2013 at 04:56:43PM +0800, John Luk wrote: > EDIT:Apologies for miss-sent mail. > > Great! Seems that we're on the right way, I got the output below: > > # dtrace -s ufunc.d -c ./a.out a.out > dtrace: script 'ufunc.d' matched 5 probes > ^C > > foo 1 > foo1 1 > main 1 > > through the inet_makeaddr was missing. I applied the patch with: It could be that your compiler is inlining it. Can you run the following commands and paste the output? # gdb ./a.out (gdb) disas main Thanks -Mark > > patch < libproc_sym_lookup-9.1.diff > > Thanks again for your patch, Mark :) > > > Cheers, > spin6lock > > 2013/11/4 John Luk <john.37@gmail.com>: > > Great! Seems that we're on the right way, I got the output below: > > > > # dtrace -s ufunc.d -c ./a.out a.out > > dtrace: script 'ufunc.d' matched 5 probes > > ^C > > > > foo 1 > > foo1 1 > > main 1 > > > > through the inet_makeaddr was missing. I applied the patch with: > > > > patch < libproc_sym_lookup-9.1.diff > > > > Thanks again for your patch, Mark :) > > > > Cheers, > > spin6lock > > > > > > 2013/11/4 Mark Johnston <markj@freebsd.org>: > >> On Mon, Nov 04, 2013 at 12:11:55PM +0800, John Luk wrote: > >>> Thanks, Mark. But I still got nothing :( > >>> The line number of your patch wasn't match with mine, I patched it > >>> on hand. Was it because I was on an older version of src? The head > >>> of proc_sym.c shows: > >>> > >>> $FreeBSD: release/9.1.0/lib/libproc/proc_sym.c 211184 2010-08-11 > >>> 17:33:26Z rpaulo > >>> > >>> And the patch of mine is include below, is it correct? > >> > >> Sorry, I missed that you were on 9.1. The patch you pasted had a mistake > >> in it; can you instead try applying the patch here: > >> > >> http://people.freebsd.org/~markj/patches/libproc_sym_lookup-9.1.diff > >> > >> I created it against the 9.1 tree, so it should apply cleanly. I built and > >> installed the patched 9.1 libproc on a machine running head, and got the > >> expected behaviour: > >> > >> mark@raichu: ~/src/dtrace/ufunc $ sudo dtrace -s ufunc.d -c ./test test > >> dtrace: script 'ufunc.d' matched 9 probes > >> dtrace: pid 11555 has exited > >> > >> __do_global_dtors_aux 1 > >> foo 1 > >> foo1 1 > >> inet_makeaddr 1 > >> main 1 > >> > >> mark@raichu: ~/src/dtrace/ufunc $ > >> > >> I don't think that this will be the final patch; checking for ET_EXEC to > >> determine whether to add a relocation offset seems a bit dubious; I'm > >> pretty sure it won't work for position-independent executables. > >> > >> Thanks, > >> -Mark > >> > >>> > >>> [...] > >>>
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