FM / pod

/usr/share/perl5/pod

Name	Size	Mode	Actions
perl.pod	16667	0644	edit dl rm
perl56delta.pod	107201	0644	edit dl rm
perl58delta.pod	115165	0644	edit dl rm
perl561delta.pod	124713	0644	edit dl rm
perl581delta.pod	38060	0644	edit dl rm
perl582delta.pod	4470	0644	edit dl rm
perl583delta.pod	6335	0644	edit dl rm
perl584delta.pod	7363	0644	edit dl rm
perl585delta.pod	5889	0644	edit dl rm
perl586delta.pod	4651	0644	edit dl rm
perl587delta.pod	8357	0644	edit dl rm
perl588delta.pod	25281	0644	edit dl rm
perl589delta.pod	53904	0644	edit dl rm
perl5004delta.pod	56240	0644	edit dl rm
perl5005delta.pod	34283	0644	edit dl rm
perl5100delta.pod	55533	0644	edit dl rm
perl5101delta.pod	43888	0644	edit dl rm
perl5120delta.pod	89271	0644	edit dl rm
perl5121delta.pod	10141	0644	edit dl rm
perl5122delta.pod	9603	0644	edit dl rm
perl5123delta.pod	4100	0644	edit dl rm
perl5124delta.pod	3672	0644	edit dl rm
perl5125delta.pod	7683	0644	edit dl rm
perl5140delta.pod	144325	0644	edit dl rm
perl5141delta.pod	7966	0644	edit dl rm
perl5142delta.pod	6892	0644	edit dl rm
perl5143delta.pod	7760	0644	edit dl rm
perl5144delta.pod	6327	0644	edit dl rm
perl5160delta.pod	133651	0644	edit dl rm
perl5161delta.pod	6142	0644	edit dl rm
perl5162delta.pod	3594	0644	edit dl rm
perl5163delta.pod	4085	0644	edit dl rm
perl5180delta.pod	119429	0644	edit dl rm
perl5181delta.pod	6597	0644	edit dl rm
perl5182delta.pod	5335	0644	edit dl rm
perl5184delta.pod	4642	0644	edit dl rm
perl5200delta.pod	115698	0644	edit dl rm
perl5201delta.pod	10899	0644	edit dl rm
perl5202delta.pod	12509	0644	edit dl rm
perl5203delta.pod	9392	0644	edit dl rm
perl5220delta.pod	130963	0644	edit dl rm
perl5221delta.pod	10767	0644	edit dl rm
perl5222delta.pod	12629	0644	edit dl rm
perl5223delta.pod	8456	0644	edit dl rm
perl5224delta.pod	4460	0644	edit dl rm
perl5240delta.pod	64923	0644	edit dl rm
perl5241delta.pod	8215	0644	edit dl rm
perl5242delta.pod	4113	0644	edit dl rm
perl5243delta.pod	11428	0644	edit dl rm
perl5244delta.pod	4510	0644	edit dl rm
perl5260delta.pod	101835	0644	edit dl rm
perl5261delta.pod	7927	0644	edit dl rm
perl5262delta.pod	7880	0644	edit dl rm
perl5263delta.pod	7067	0644	edit dl rm
perl5280delta.pod	72113	0644	edit dl rm
perl5281delta.pod	4639	0644	edit dl rm
perl5282delta.pod	6200	0644	edit dl rm
perl5283delta.pod	5111	0644	edit dl rm
perl5300delta.pod	41281	0644	edit dl rm
perl5301delta.pod	5730	0644	edit dl rm
perl5302delta.pod	4682	0644	edit dl rm
perl5303delta.pod	4980	0644	edit dl rm
perl5320delta.pod	54601	0644	edit dl rm
perl5321delta.pod	7003	0644	edit dl rm
perlaix.pod	20438	0644	edit dl rm
perlamiga.pod	5749	0644	edit dl rm
perlandroid.pod	8222	0644	edit dl rm
perlapi.pod	493106	0644	edit dl rm
perlapio.pod	21336	0644	edit dl rm
perlartistic.pod	7010	0644	edit dl rm
perlbook.pod	8386	0644	edit dl rm
perlboot.pod	294	0644	edit dl rm
perlbot.pod	304	0644	edit dl rm
perlbs2000.pod	7994	0644	edit dl rm
perlcall.pod	56738	0644	edit dl rm
perlcheat.pod	4480	0644	edit dl rm
perlclib.pod	9607	0644	edit dl rm
perlcn.pod	4763	0644	edit dl rm
perlcommunity.pod	6983	0644	edit dl rm
perlcygwin.pod	27202	0644	edit dl rm
perldata.pod	49782	0644	edit dl rm
perldbmfilter.pod	4981	0644	edit dl rm
perldebguts.pod	42331	0644	edit dl rm
perldebtut.pod	22152	0644	edit dl rm
perldebug.pod	39383	0644	edit dl rm
perldelta.pod	7003	0644	edit dl rm
perldeprecation.pod	20825	0644	edit dl rm
perldiag.pod	296986	0644	edit dl rm
perldos.pod	10522	0644	edit dl rm
perldsc.pod	25614	0644	edit dl rm
perldtrace.pod	7959	0644	edit dl rm
perlebcdic.pod	84345	0644	edit dl rm
perlembed.pod	37569	0644	edit dl rm
perlexperiment.pod	7234	0644	edit dl rm
perlfork.pod	13355	0644	edit dl rm
perlform.pod	16608	0644	edit dl rm
perlfreebsd.pod	1623	0644	edit dl rm
perlfunc.pod	403777	0644	edit dl rm
perlgit.pod	29591	0644	edit dl rm
perlgov.pod	14481	0644	edit dl rm
perlgpl.pod	13815	0644	edit dl rm
perlguts.pod	162103	0644	edit dl rm
perlhack.pod	43157	0644	edit dl rm
perlhacktips.pod	57692	0644	edit dl rm
perlhacktut.pod	6153	0644	edit dl rm
perlhaiku.pod	1508	0644	edit dl rm
perlhist.pod	56164	0644	edit dl rm
perlhpux.pod	30609	0644	edit dl rm
perlhurd.pod	1994	0644	edit dl rm
perlintern.pod	83565	0644	edit dl rm
perlinterp.pod	33715	0644	edit dl rm
perlintro.pod	22135	0644	edit dl rm
perliol.pod	34804	0644	edit dl rm
perlipc.pod	71529	0644	edit dl rm
perlirix.pod	4415	0644	edit dl rm
perljp.pod	8431	0644	edit dl rm
perlko.pod	12208	0644	edit dl rm
perllexwarn.pod	355	0644	edit dl rm
perllinux.pod	2007	0644	edit dl rm
perllocale.pod	74112	0644	edit dl rm
perllol.pod	9580	0644	edit dl rm
perlmacos.pod	998	0644	edit dl rm
perlmacosx.pod	12124	0644	edit dl rm
perlmod.pod	26197	0644	edit dl rm
perlmodinstall.pod	10261	0644	edit dl rm
perlmodlib.pod	76348	0644	edit dl rm
perlmodstyle.pod	22588	0644	edit dl rm
perlmroapi.pod	3280	0644	edit dl rm
perlnetware.pod	6648	0644	edit dl rm
perlnewmod.pod	11037	0644	edit dl rm
perlnumber.pod	8353	0644	edit dl rm
perlobj.pod	35717	0644	edit dl rm
perlootut.pod	26757	0644	edit dl rm
perlop.pod	148888	0644	edit dl rm
perlopenbsd.pod	1224	0644	edit dl rm
perlopentut.pod	15223	0644	edit dl rm
perlos2.pod	93348	0644	edit dl rm
perlos390.pod	16527	0644	edit dl rm
perlos400.pod	4765	0644	edit dl rm
perlpacktut.pod	51370	0644	edit dl rm
perlperf.pod	49881	0644	edit dl rm
perlplan9.pod	5125	0644	edit dl rm
perlpod.pod	23076	0644	edit dl rm
perlpodspec.pod	68628	0644	edit dl rm
perlpolicy.pod	26562	0644	edit dl rm
perlport.pod	88693	0644	edit dl rm
perlpragma.pod	5176	0644	edit dl rm
perlqnx.pod	6673	0644	edit dl rm
perlre.pod	130817	0644	edit dl rm
perlreapi.pod	30245	0644	edit dl rm
perlrebackslash.pod	32285	0644	edit dl rm
perlrecharclass.pod	49707	0644	edit dl rm
perlref.pod	35432	0644	edit dl rm
perlreftut.pod	18826	0644	edit dl rm
perlreguts.pod	39301	0644	edit dl rm
perlrepository.pod	509	0644	edit dl rm
perlrequick.pod	19141	0644	edit dl rm
perlreref.pod	15590	0644	edit dl rm
perlretut.pod	122527	0644	edit dl rm
perlriscos.pod	1529	0644	edit dl rm
perlrun.pod	55980	0644	edit dl rm
perlsec.pod	27601	0644	edit dl rm
perlsecpolicy.pod	19450	0644	edit dl rm
perlsolaris.pod	29843	0644	edit dl rm
perlsource.pod	7132	0644	edit dl rm
perlstyle.pod	8734	0644	edit dl rm
perlsub.pod	74405	0644	edit dl rm
perlsymbian.pod	15344	0644	edit dl rm
perlsyn.pod	45138	0644	edit dl rm
perlsynology.pod	7960	0644	edit dl rm
perlthrtut.pod	46522	0644	edit dl rm
perltie.pod	39314	0644	edit dl rm
perltoc.pod	701800	0644	edit dl rm
perltodo.pod	372	0644	edit dl rm
perltooc.pod	294	0644	edit dl rm
perltoot.pod	294	0644	edit dl rm
perltrap.pod	10623	0644	edit dl rm
perltru64.pod	8492	0644	edit dl rm
perltw.pod	4463	0644	edit dl rm
perlunicode.pod	91353	0644	edit dl rm
perlunicook.pod	25658	0644	edit dl rm
perlunifaq.pod	13644	0644	edit dl rm
perluniintro.pod	38647	0644	edit dl rm
perluniprops.pod	441614	0644	edit dl rm
perlunitut.pod	7951	0644	edit dl rm
perlutil.pod	7291	0644	edit dl rm
perlvar.pod	82577	0644	edit dl rm
perlvms.pod	50823	0644	edit dl rm
perlvos.pod	3843	0644	edit dl rm
perlwin32.pod	40317	0644	edit dl rm

Edit: /usr/share/perl5/pod/perldtrace.pod (7959B)

=head1 NAME

perldtrace - Perl's support for DTrace

=head1 SYNOPSIS

# dtrace -Zn 'perl::sub-entry, perl::sub-return { trace(copyinstr(arg0)) }'
 dtrace: description 'perl::sub-entry, perl::sub-return ' matched 10 probes

# perl -E 'sub outer { inner(@_) } sub inner { say shift } outer("hello")'
 hello

(dtrace output)
 CPU     ID                    FUNCTION:NAME
   0  75915       Perl_pp_entersub:sub-entry   BEGIN
   0  75915       Perl_pp_entersub:sub-entry   import
   0  75922      Perl_pp_leavesub:sub-return   import
   0  75922      Perl_pp_leavesub:sub-return   BEGIN
   0  75915       Perl_pp_entersub:sub-entry   outer
   0  75915       Perl_pp_entersub:sub-entry   inner
   0  75922      Perl_pp_leavesub:sub-return   inner
   0  75922      Perl_pp_leavesub:sub-return   outer

=head1 DESCRIPTION

DTrace is a framework for comprehensive system- and application-level
tracing. Perl is a DTrace I<provider>, meaning it exposes several
I<probes> for instrumentation. You can use these in conjunction
with kernel-level probes, as well as probes from other providers
such as MySQL, in order to diagnose software defects, or even just
your application's bottlenecks.

Perl must be compiled with the C<-Dusedtrace> option in order to
make use of the provided probes. While DTrace aims to have no
overhead when its instrumentation is not active, Perl's support
itself cannot uphold that guarantee, so it is built without DTrace
probes under most systems. One notable exception is that Mac OS X
ships a F</usr/bin/perl> with DTrace support enabled.

=head1 HISTORY

=over 4

=item 5.10.1

Perl's initial DTrace support was added, providing C<sub-entry> and
C<sub-return> probes.

=item 5.14.0

The C<sub-entry> and C<sub-return> probes gain a fourth argument: the
package name of the function.

=item 5.16.0

The C<phase-change> probe was added.

=item 5.18.0

The C<op-entry>, C<loading-file>, and C<loaded-file> probes were added.

=back

=head1 PROBES

=over 4

=item sub-entry(SUBNAME, FILE, LINE, PACKAGE)

Traces the entry of any subroutine. Note that all of the variables
refer to the subroutine that is being invoked; there is currently
no way to get ahold of any information about the subroutine's
I<caller> from a DTrace action.

:*perl*::sub-entry {
     printf("%s::%s entered at %s line %d\n",
           copyinstr(arg3), copyinstr(arg0), copyinstr(arg1), arg2);
 }

=item sub-return(SUBNAME, FILE, LINE, PACKAGE)

Traces the exit of any subroutine. Note that all of the variables
refer to the subroutine that is returning; there is currently no
way to get ahold of any information about the subroutine's I<caller>
from a DTrace action.

:*perl*::sub-return {
     printf("%s::%s returned at %s line %d\n",
           copyinstr(arg3), copyinstr(arg0), copyinstr(arg1), arg2);
 }

=item phase-change(NEWPHASE, OLDPHASE)

Traces changes to Perl's interpreter state. You can internalize this
as tracing changes to Perl's C<${^GLOBAL_PHASE}> variable, especially
since the values for C<NEWPHASE> and C<OLDPHASE> are the strings that
C<${^GLOBAL_PHASE}> reports.

:*perl*::phase-change {
     printf("Phase changed from %s to %s\n",
         copyinstr(arg1), copyinstr(arg0));
 }

=item op-entry(OPNAME)

Traces the execution of each opcode in the Perl runloop. This probe
is fired before the opcode is executed. When the Perl debugger is
enabled, the DTrace probe is fired I<after> the debugger hooks (but
still before the opcode itself is executed).

:*perl*::op-entry {
     printf("About to execute opcode %s\n", copyinstr(arg0));
 }

=item loading-file(FILENAME)

Fires when Perl is about to load an individual file, whether from
C<use>, C<require>, or C<do>. This probe fires before the file is
read from disk. The filename argument is converted to local filesystem
paths instead of providing C<Module::Name>-style names.

:*perl*:loading-file {
     printf("About to load %s\n", copyinstr(arg0));
 }

=item loaded-file(FILENAME)

Fires when Perl has successfully loaded an individual file, whether
from C<use>, C<require>, or C<do>. This probe fires after the file
is read from disk and its contents evaluated. The filename argument
is converted to local filesystem paths instead of providing
C<Module::Name>-style names.

:*perl*:loaded-file {
     printf("Successfully loaded %s\n", copyinstr(arg0));
 }

=back

=head1 EXAMPLES

=over 4

=item Most frequently called functions

# dtrace -qZn 'sub-entry { @[strjoin(strjoin(copyinstr(arg3),"::"),copyinstr(arg0))] = count() } END {trunc(@, 10)}'

Class::MOP::Attribute::slots                                    400
 Try::Tiny::catch                                                411
 Try::Tiny::try                                                  411
 Class::MOP::Instance::inline_slot_access                        451
 Class::MOP::Class::Immutable::Trait:::around                    472
 Class::MOP::Mixin::AttributeCore::has_initializer               496
 Class::MOP::Method::Wrapped::__ANON__                           544
 Class::MOP::Package::_package_stash                             737
 Class::MOP::Class::initialize                                  1128
 Class::MOP::get_metaclass_by_name                              1204

=item Trace function calls

# dtrace -qFZn 'sub-entry, sub-return { trace(copyinstr(arg0)) }'

0  -> Perl_pp_entersub                        BEGIN
 0  <- Perl_pp_leavesub                        BEGIN
 0  -> Perl_pp_entersub                        BEGIN
 0    -> Perl_pp_entersub                      import
 0    <- Perl_pp_leavesub                      import
 0  <- Perl_pp_leavesub                        BEGIN
 0  -> Perl_pp_entersub                        BEGIN
 0    -> Perl_pp_entersub                      dress
 0    <- Perl_pp_leavesub                      dress
 0    -> Perl_pp_entersub                      dirty
 0    <- Perl_pp_leavesub                      dirty
 0    -> Perl_pp_entersub                      whiten
 0    <- Perl_pp_leavesub                      whiten
 0  <- Perl_dounwind                           BEGIN

=item Function calls during interpreter cleanup

# dtrace -Zn 'phase-change /copyinstr(arg0) == "END"/ { self->ending = 1 } sub-entry /self->ending/ { trace(copyinstr(arg0)) }'

CPU     ID                    FUNCTION:NAME
   1  77214       Perl_pp_entersub:sub-entry   END
   1  77214       Perl_pp_entersub:sub-entry   END
   1  77214       Perl_pp_entersub:sub-entry   cleanup
   1  77214       Perl_pp_entersub:sub-entry   _force_writable
   1  77214       Perl_pp_entersub:sub-entry   _force_writable

=item System calls at compile time

# dtrace -qZn 'phase-change /copyinstr(arg0) == "START"/ { self->interesting = 1 } phase-change /copyinstr(arg0) == "RUN"/ { self->interesting = 0 } syscall::: /self->interesting/ { @[probefunc] = count() } END { trunc(@, 3) }'

lseek                                                           310
 read                                                            374
 stat64                                                         1056

=item Perl functions that execute the most opcodes

# dtrace -qZn 'sub-entry { self->fqn = strjoin(copyinstr(arg3), strjoin("::", copyinstr(arg0))) } op-entry /self->fqn != ""/ { @[self->fqn] = count() } END { trunc(@, 3) }'

warnings::unimport                                             4589
 Exporter::Heavy::_rebuild_cache                                5039
 Exporter::import                                              14578

=back

=head1 REFERENCES

=over 4

=item DTrace Dynamic Tracing Guide

L<http://dtrace.org/guide/preface.html>

=item DTrace: Dynamic Tracing in Oracle Solaris, Mac OS X and FreeBSD

L<https://www.amazon.com/DTrace-Dynamic-Tracing-Solaris-FreeBSD/dp/0132091518/>

=back

=head1 SEE ALSO

=over 4

=item L<Devel::DTrace::Provider>

This CPAN module lets you create application-level DTrace probes written in
Perl.

=back

=head1 AUTHORS

Shawn M Moore C<sartak@gmail.com>

=cut

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