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perf trace: Add interface to access perf data from Perl handlers

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The Perl scripting support for perf trace allows most of a trace
event's data to be accessed directly as handler arguments, but
not all of it e.g. the less common fields aren't passed in.  To
give scripts access to the other fields and/or any other data or
metadata in the main perf executable that might be useful, a way
to access the C data in perf from Perl is needed; this patch
uses the Perl XS facility to do it for the common_xxx event
fields not passed to handler functions.

Context.pm exports three functions to Perl scripts that access
fields for the current event by calling back into perf:
common_pc(), common_flags() and common_lock_depth().  Support
for common_flags() field values was added to Core.pm and a
script used to sanity check these and other basic scripting
features, check-perf-trace.pl, was also added.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-6-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tom Zanussi 2009-11-25 01:15:50 -06:00 committed by Ingo Molnar
parent bcefe12eff
commit d1b93772be
13 changed files with 474 additions and 13 deletions
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6
tools/perf/Makefile
View file

@ -497,6 +497,7 @@ ifneq ($(shell sh -c "(echo '\#include <EXTERN.h>'; echo '\#include <perl.h>'; e
BASIC_CFLAGS += -DNO_LIBPERL
else
ALL_LDFLAGS += $(PERL_EMBED_LDOPTS)
LIB_OBJS += scripts/perl/Perf-Trace-Util/Context.o
endif
ifdef NO_DEMANGLE
@ -873,6 +874,9 @@ util/find_next_bit.o: ../../lib/find_next_bit.c PERF-CFLAGS
util/trace-event-perl.o: util/trace-event-perl.c PERF-CFLAGS
$(QUIET_CC)$(CC) -o util/trace-event-perl.o -c $(ALL_CFLAGS) $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter $<
scripts/perl/Perf-Trace-Util/Context.o: scripts/perl/Perf-Trace-Util/Context.c PERF-CFLAGS
$(QUIET_CC)$(CC) -o scripts/perl/Perf-Trace-Util/Context.o -c $(ALL_CFLAGS) $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-nested-externs $<
perf-%$X: %.o $(PERFLIBS)
$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
@ -1072,7 +1076,7 @@ distclean: clean
# $(RM) configure
clean:
$(RM) *.o */*.o $(LIB_FILE)
$(RM) *.o */*.o */*/*.o */*/*/*.o $(LIB_FILE)
$(RM) $(ALL_PROGRAMS) $(BUILT_INS) perf$X
$(RM) $(TEST_PROGRAMS)
$(RM) *.spec *.pyc *.pyo */*.pyc */*.pyo common-cmds.h TAGS tags cscope*

134
tools/perf/scripts/perl/Perf-Trace-Util/Context.c Normal file
View file

@ -0,0 +1,134 @@
/*
* This file was generated automatically by ExtUtils::ParseXS version 2.18_02 from the
* contents of Context.xs. Do not edit this file, edit Context.xs instead.
*
* ANY CHANGES MADE HERE WILL BE LOST!
*
*/
#line 1 "Context.xs"
/*
* Context.xs. XS interfaces for perf trace.
*
* Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "../../../util/trace-event-perl.h"
#ifndef PERL_UNUSED_VAR
# define PERL_UNUSED_VAR(var) if (0) var = var
#endif
#line 41 "Context.c"
XS(XS_Perf__Trace__Context_get_common_pc); /* prototype to pass -Wmissing-prototypes */
XS(XS_Perf__Trace__Context_get_common_pc)
{
#ifdef dVAR
dVAR; dXSARGS;
#else
dXSARGS;
#endif
if (items != 1)
Perl_croak(aTHX_ "Usage: %s(%s)", "Perf::Trace::Context::get_common_pc", "context");
PERL_UNUSED_VAR(cv); /* -W */
{
struct scripting_context * context = INT2PTR(struct scripting_context *,SvIV(ST(0)));
int RETVAL;
dXSTARG;
RETVAL = get_common_pc(context);
XSprePUSH; PUSHi((IV)RETVAL);
}
XSRETURN(1);
}
XS(XS_Perf__Trace__Context_get_common_flags); /* prototype to pass -Wmissing-prototypes */
XS(XS_Perf__Trace__Context_get_common_flags)
{
#ifdef dVAR
dVAR; dXSARGS;
#else
dXSARGS;
#endif
if (items != 1)
Perl_croak(aTHX_ "Usage: %s(%s)", "Perf::Trace::Context::get_common_flags", "context");
PERL_UNUSED_VAR(cv); /* -W */
{
struct scripting_context * context = INT2PTR(struct scripting_context *,SvIV(ST(0)));
int RETVAL;
dXSTARG;
RETVAL = get_common_flags(context);
XSprePUSH; PUSHi((IV)RETVAL);
}
XSRETURN(1);
}
XS(XS_Perf__Trace__Context_get_common_lock_depth); /* prototype to pass -Wmissing-prototypes */
XS(XS_Perf__Trace__Context_get_common_lock_depth)
{
#ifdef dVAR
dVAR; dXSARGS;
#else
dXSARGS;
#endif
if (items != 1)
Perl_croak(aTHX_ "Usage: %s(%s)", "Perf::Trace::Context::get_common_lock_depth", "context");
PERL_UNUSED_VAR(cv); /* -W */
{
struct scripting_context * context = INT2PTR(struct scripting_context *,SvIV(ST(0)));
int RETVAL;
dXSTARG;
RETVAL = get_common_lock_depth(context);
XSprePUSH; PUSHi((IV)RETVAL);
}
XSRETURN(1);
}
#ifdef __cplusplus
extern "C"
#endif
XS(boot_Perf__Trace__Context); /* prototype to pass -Wmissing-prototypes */
XS(boot_Perf__Trace__Context)
{
#ifdef dVAR
dVAR; dXSARGS;
#else
dXSARGS;
#endif
const char* file = __FILE__;
PERL_UNUSED_VAR(cv); /* -W */
PERL_UNUSED_VAR(items); /* -W */
XS_VERSION_BOOTCHECK ;
newXSproto("Perf::Trace::Context::get_common_pc", XS_Perf__Trace__Context_get_common_pc, file, "$");
newXSproto("Perf::Trace::Context::get_common_flags", XS_Perf__Trace__Context_get_common_flags, file, "$");
newXSproto("Perf::Trace::Context::get_common_lock_depth", XS_Perf__Trace__Context_get_common_lock_depth, file, "$");
if (PL_unitcheckav)
call_list(PL_scopestack_ix, PL_unitcheckav);
XSRETURN_YES;
}

41
tools/perf/scripts/perl/Perf-Trace-Util/Context.xs Normal file
View file

@ -0,0 +1,41 @@
/*
* Context.xs. XS interfaces for perf trace.
*
* Copyright (C) 2009 Tom Zanussi <tzanussi@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "../../../util/trace-event-perl.h"
MODULE = Perf::Trace::Context PACKAGE = Perf::Trace::Context
PROTOTYPES: ENABLE
int
get_common_pc(context)
struct scripting_context * context
int
get_common_flags(context)
struct scripting_context * context
int
get_common_lock_depth(context)
struct scripting_context * context

11
tools/perf/scripts/perl/Perf-Trace-Util/Makefile.PL
View file

@ -3,10 +3,15 @@ use ExtUtils::MakeMaker;
# See lib/ExtUtils/MakeMaker.pm for details of how to influence
# the contents of the Makefile that is written.
WriteMakefile(
NAME => 'Perf::Trace::Util',
VERSION_FROM => 'lib/Perf/Trace/Util.pm', # finds $VERSION
NAME => 'Perf::Trace::Context',
VERSION_FROM => 'lib/Perf/Trace/Context.pm', # finds $VERSION
PREREQ_PM => {}, # e.g., Module::Name => 1.1
($] >= 5.005 ? ## Add these new keywords supported since 5.005
(ABSTRACT_FROM => 'lib/Perf/Trace/Util.pm', # retrieve abstract from module
(ABSTRACT_FROM => 'lib/Perf/Trace/Context.pm', # retrieve abstract from module
AUTHOR => 'Tom Zanussi <tzanussi@gmail.com>') : ()),
LIBS => [''], # e.g., '-lm'
DEFINE => '-I ../..', # e.g., '-DHAVE_SOMETHING'
INC => '-I.', # e.g., '-I. -I/usr/include/other'
# Un-comment this if you add C files to link with later:
OBJECT => 'Context.o', # link all the C files too
);

34
tools/perf/scripts/perl/Perf-Trace-Util/README
View file

@ -3,6 +3,34 @@ Perf-Trace-Util version 0.01
This module contains utility functions for use with perf trace.
Core.pm and Util.pm are pure Perl modules; Core.pm contains routines
that the core perf support for Perl calls on and should always be
'used', while Util.pm contains useful but optional utility functions
that scripts may want to use. Context.pm contains the Perl->C
interface that allows scripts to access data in the embedding perf
executable; scripts wishing to do that should 'use Context.pm'.
The Perl->C perf interface is completely driven by Context.xs. If you
want to add new Perl functions that end up accessing C data in the
perf executable, you add desciptions of the new functions here.
scripting_context is a pointer to the perf data in the perf executable
that you want to access - it's passed as the second parameter,
$context, to all handler functions.
After you do that:
perl Makefile.PL # to create a Makefile for the next step
make # to create Context.c
edit Context.c to add const to the char* file = __FILE__ line in
XS(boot_Perf__Trace__Context) to silence a warning/error.
You can delete the Makefile, object files and anything else that was
generated e.g. blib and shared library, etc, except for of course
Context.c
You should then be able to run the normal perf make as usual.
INSTALLATION
Building perf with perf trace Perl scripting should install this
@ -15,12 +43,10 @@ DEPENDENCIES
This module requires these other modules and libraries:
blah blah blah
None
COPYRIGHT AND LICENCE
Put the correct copyright and licence information here.
Copyright (C) 2009 by Tom Zanussi <tzanussi@gmail.com>
This library is free software; you can redistribute it and/or modify
@ -31,5 +57,3 @@ Alternatively, this software may be distributed under the terms of the
GNU General Public License ("GPL") version 2 as published by the Free
Software Foundation.

55
tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace/Context.pm Normal file
View file

@ -0,0 +1,55 @@
package Perf::Trace::Context;
use 5.010000;
use strict;
use warnings;
require Exporter;
our @ISA = qw(Exporter);
our %EXPORT_TAGS = ( 'all' => [ qw(
) ] );
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
our @EXPORT = qw(
common_pc common_flags common_lock_depth
);
our $VERSION = '0.01';
require XSLoader;
XSLoader::load('Perf::Trace::Context', $VERSION);
1;
__END__
=head1 NAME
Perf::Trace::Context - Perl extension for accessing functions in perf.
=head1 SYNOPSIS
use Perf::Trace::Context;
=head1 SEE ALSO
Perf (trace) documentation
=head1 AUTHOR
Tom Zanussi, E<lt>tzanussi@gmail.com<gt>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2009 by Tom Zanussi
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.10.0 or,
at your option, any later version of Perl 5 you may have available.
Alternatively, this software may be distributed under the terms of the
GNU General Public License ("GPL") version 2 as published by the Free
Software Foundation.
=cut

35
tools/perf/scripts/perl/Perf-Trace-Util/lib/Perf/Trace/Core.pm
View file

@ -16,10 +16,45 @@ our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
our @EXPORT = qw(
define_flag_field define_flag_value flag_str dump_flag_fields
define_symbolic_field define_symbolic_value symbol_str dump_symbolic_fields
trace_flag_str
);
our $VERSION = '0.01';
my %trace_flags = (0x00 => "NONE",
0x01 => "IRQS_OFF",
0x02 => "IRQS_NOSUPPORT",
0x04 => "NEED_RESCHED",
0x08 => "HARDIRQ",
0x10 => "SOFTIRQ");
sub trace_flag_str
{
my ($value) = @_;
my $string;
my $print_delim = 0;
foreach my $idx (sort {$a <=> $b} keys %trace_flags) {
if (!$value && !$idx) {
$string .= "NONE";
last;
}
if ($idx && ($value & $idx) == $idx) {
if ($print_delim) {
$string .= " | ";
}
$string .= "$trace_flags{$idx}";
$print_delim = 1;
$value &= ~$idx;
}
}
return $string;
}
my %flag_fields;
my %symbolic_fields;

1
tools/perf/scripts/perl/Perf-Trace-Util/typemap Normal file
View file

@ -0,0 +1 @@
struct scripting_context * T_PTR

106
tools/perf/scripts/perl/check-perf-trace.pl Normal file
View file

@ -0,0 +1,106 @@
# perf trace event handlers, generated by perf trace -g perl
# (c) 2009, Tom Zanussi <tzanussi@gmail.com>
# Licensed under the terms of the GNU GPL License version 2
# This script tests basic functionality such as flag and symbol
# strings, common_xxx() calls back into perf, begin, end, unhandled
# events, etc. Basically, if this script runs successfully and
# displays expected results, perl scripting support should be ok.
use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
use lib "./Perf-Trace-Util/lib";
use Perf::Trace::Core;
use Perf::Trace::Context;
use Perf::Trace::Util;
sub trace_begin
{
print "trace_begin\n";
}
sub trace_end
{
print "trace_end\n";
print_unhandled();
}
sub irq::softirq_entry
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm,
$vec) = @_;
print_header($event_name, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm);
print_uncommon($context);
printf("vec=%s\n",
symbol_str("irq::softirq_entry", "vec", $vec));
}
sub kmem::kmalloc
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm,
$call_site, $ptr, $bytes_req, $bytes_alloc,
$gfp_flags) = @_;
print_header($event_name, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm);
print_uncommon($context);
printf("call_site=%p, ptr=%p, bytes_req=%u, bytes_alloc=%u, ".
"gfp_flags=%s\n",
$call_site, $ptr, $bytes_req, $bytes_alloc,
flag_str("kmem::kmalloc", "gfp_flags", $gfp_flags));
}
# print trace fields not included in handler args
sub print_uncommon
{
my ($context) = @_;
printf("common_preempt_count=%d, common_flags=%s, common_lock_depth=%d, ",
common_pc($context), trace_flag_str(common_flags($context)),
common_lock_depth($context));
}
my %unhandled;
sub print_unhandled
{
if ((scalar keys %unhandled) == 0) {
return;
}
print "\nunhandled events:\n\n";
printf("%-40s %10s\n", "event", "count");
printf("%-40s %10s\n", "----------------------------------------",
"-----------");
foreach my $event_name (keys %unhandled) {
printf("%-40s %10d\n", $event_name, $unhandled{$event_name});
}
}
sub trace_unhandled
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm) = @_;
$unhandled{$event_name}++;
}
sub print_header
{
my ($event_name, $cpu, $secs, $nsecs, $pid, $comm) = @_;
printf("%-20s %5u %05u.%09u %8u %-20s ",
$event_name, $cpu, $secs, $nsecs, $pid, $comm);
}

6
tools/perf/util/trace-event-parse.c
View file

@ -1982,7 +1982,7 @@ int trace_parse_common_pid(void *data)
"common_pid");
}
static int parse_common_pc(void *data)
int parse_common_pc(void *data)
{
static int pc_offset;
static int pc_size;
@ -1991,7 +1991,7 @@ static int parse_common_pc(void *data)
"common_preempt_count");
}
static int parse_common_flags(void *data)
int parse_common_flags(void *data)
{
static int flags_offset;
static int flags_size;
@ -2000,7 +2000,7 @@ static int parse_common_flags(void *data)
"common_flags");
}
static int parse_common_lock_depth(void *data)
int parse_common_lock_depth(void *data)
{
static int ld_offset;
static int ld_size;

46
tools/perf/util/trace-event-perl.c
View file

@ -30,6 +30,21 @@
#include "trace-event.h"
#include "trace-event-perl.h"
void xs_init(pTHX);
void boot_Perf__Trace__Context(pTHX_ CV *cv);
void boot_DynaLoader(pTHX_ CV *cv);
void xs_init(pTHX)
{
const char *file = __FILE__;
dXSUB_SYS;
newXS("Perf::Trace::Context::bootstrap", boot_Perf__Trace__Context,
file);
newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
}
INTERP my_perl;
#define FTRACE_MAX_EVENT \
@ -227,6 +242,33 @@ static inline struct event *find_cache_event(int type)
return event;
}
int get_common_pc(struct scripting_context *context)
{
int pc;
pc = parse_common_pc(context->event_data);
return pc;
}
int get_common_flags(struct scripting_context *context)
{
int flags;
flags = parse_common_flags(context->event_data);
return flags;
}
int get_common_lock_depth(struct scripting_context *context)
{
int lock_depth;
lock_depth = parse_common_lock_depth(context->event_data);
return lock_depth;
}
static void perl_process_event(int cpu, void *data,
int size __attribute((unused)),
unsigned long long nsecs, char *comm)
@ -290,6 +332,7 @@ static void perl_process_event(int cpu, void *data,
}
PUTBACK;
if (get_cv(handler, 0))
call_pv(handler, G_SCALAR);
else if (get_cv("main::trace_unhandled", 0)) {
@ -328,7 +371,8 @@ static int perl_start_script(const char *script)
my_perl = perl_alloc();
perl_construct(my_perl);
if (perl_parse(my_perl, NULL, 2, (char **)command_line, (char **)NULL))
if (perl_parse(my_perl, xs_init, 2, (char **)command_line,
(char **)NULL))
return -1;
perl_run(my_perl);

9
tools/perf/util/trace-event-perl.h
View file

@ -29,6 +29,11 @@ typedef int INTERP;
#define perl_run(a) (0)
#define perl_destruct(a) (0)
#define perl_free(a) (0)
#define pTHX void
#define CV void
#define dXSUB_SYS
#define pTHX_
static inline void newXS(const char *a, void *b, const char *c) {}
#else
#include <EXTERN.h>
#include <perl.h>
@ -39,4 +44,8 @@ struct scripting_context {
void *event_data;
};
int get_common_pc(struct scripting_context *context);
int get_common_flags(struct scripting_context *context);
int get_common_lock_depth(struct scripting_context *context);
#endif /* __PERF_TRACE_EVENT_PERL_H */

3
tools/perf/util/trace-event.h
View file

@ -246,6 +246,9 @@ extern int latency_format;
int parse_header_page(char *buf, unsigned long size);
int trace_parse_common_type(void *data);
int trace_parse_common_pid(void *data);
int parse_common_pc(void *data);
int parse_common_flags(void *data);
int parse_common_lock_depth(void *data);
struct event *trace_find_event(int id);
struct event *trace_find_next_event(struct event *event);
unsigned long long read_size(void *ptr, int size);