[tip:perf/urgent] perf trace/scripting: Add support for script args

tip-bot for Tom Zanussi
2009-12-15T09:40:12Z

Commit-ID: 586bc5cce88be993dad584c3936c49f945368551
Gitweb: http://git.kernel.org/tip/586bc5cce88be993dad584c3936c49f945368551
Author: Tom Zanussi <tzanussi@gmail.com>
AuthorDate: Tue, 15 Dec 2009 02:53:35 -0600
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Tue, 15 Dec 2009 10:31:31 +0100

perf trace/scripting: Add support for script args

One oversight of the original scripting_ops patch was a lack of
support for passing args to handler scripts. This adds
argc/argv to the start_script() scripting_op, and changes the
rw-by-file script to take 'comm' arg rather than the 'perf'
value currently hard-coded. It also takes the opportunity to do
some related minor cleanup.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
LKML-Reference: <1260867220-15699-2-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
tools/perf/builtin-trace.c | 19 +++++--------
tools/perf/scripts/perl/bin/rw-by-file-report | 2 +-
tools/perf/scripts/perl/rw-by-file.pl | 5 ++-
tools/perf/util/trace-event-perl.c | 36 ++++++++++++++++++-------
tools/perf/util/trace-event.h | 2 +-
5 files changed, 38 insertions(+), 26 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 07da665..88b0353 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -12,7 +12,9 @@
static char const *script_name;
static char const *generate_script_lang;

-static int default_start_script(const char *script __attribute((unused)))
+static int default_start_script(const char *script __unused,
+ int argc __unused,
+ const char **argv __unused)
{
return 0;
}
@@ -22,7 +24,7 @@ static int default_stop_script(void)
return 0;
}

-static int default_generate_script(const char *outfile __attribute ((unused)))
+static int default_generate_script(const char *outfile __unused)
{
return 0;
}
@@ -302,15 +304,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __used)

setup_scripting();

- argc = parse_options(argc, argv, options, annotate_usage, 0);
- if (argc) {
- /*
- * Special case: if there's an argument left then assume tha
- * it's a symbol filter:
- */
- if (argc > 1)
- usage_with_options(annotate_usage, options);
- }
+ argc = parse_options(argc, argv, options, annotate_usage,
+ PARSE_OPT_STOP_AT_NON_OPTION);

setup_pager();

@@ -350,7 +345,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __used)
}

if (script_name) {
- err = scripting_ops->start_script(script_name);
+ err = scripting_ops->start_script(script_name, argc, argv);
if (err)
goto out;
}
diff --git a/tools/perf/scripts/perl/bin/rw-by-file-report b/tools/perf/scripts/perl/bin/rw-by-file-report
index f5dcf9c..1c05675 100644
--- a/tools/perf/scripts/perl/bin/rw-by-file-report
+++ b/tools/perf/scripts/perl/bin/rw-by-file-report
@@ -1,5 +1,5 @@
#!/bin/bash
-perf trace -s ~/libexec/perf-core/scripts/perl/rw-by-file.pl
+perf trace -s ~/libexec/perf-core/scripts/perl/rw-by-file.pl $1

diff --git a/tools/perf/scripts/perl/rw-by-file.pl b/tools/perf/scripts/perl/rw-by-file.pl
index 61f9156..2a39097 100644
--- a/tools/perf/scripts/perl/rw-by-file.pl
+++ b/tools/perf/scripts/perl/rw-by-file.pl
@@ -18,8 +18,9 @@ use lib "./Perf-Trace-Util/lib";
use Perf::Trace::Core;
use Perf::Trace::Util;

-# change this to the comm of the program you're interested in
-my $for_comm = "perf";
+my $usage = "perf trace -s rw-by-file.pl <comm>\n";
+
+my $for_comm = shift or die $usage;

my %reads;
my %writes;
diff --git a/tools/perf/util/trace-event-perl.c b/tools/perf/util/trace-event-perl.c
index a5ffe60..6f10e76 100644
--- a/tools/perf/util/trace-event-perl.c
+++ b/tools/perf/util/trace-event-perl.c
@@ -267,7 +267,7 @@ int common_lock_depth(struct scripting_context *context)
}

static void perl_process_event(int cpu, void *data,
- int size __attribute((unused)),
+ int size __unused,
unsigned long long nsecs, char *comm)
{
struct format_field *field;
@@ -359,28 +359,42 @@ static void run_start_sub(void)
/*
* Start trace script
*/
-static int perl_start_script(const char *script)
+static int perl_start_script(const char *script, int argc, const char **argv)
{
- const char *command_line[2] = { "", NULL };
+ const char **command_line;
+ int i, err = 0;

+ command_line = malloc((argc + 2) * sizeof(const char *));
+ command_line[0] = "";
command_line[1] = script;
+ for (i = 2; i < argc + 2; i++)
+ command_line[i] = argv[i - 2];

my_perl = perl_alloc();
perl_construct(my_perl);

- if (perl_parse(my_perl, xs_init, 2, (char **)command_line,
- (char **)NULL))
- return -1;
+ if (perl_parse(my_perl, xs_init, argc + 2, (char **)command_line,
+ (char **)NULL)) {
+ err = -1;
+ goto error;
+ }

perl_run(my_perl);
- if (SvTRUE(ERRSV))
- return -1;
+ if (SvTRUE(ERRSV)) {
+ err = -1;
+ goto error;
+ }

run_start_sub();

+ free(command_line);
fprintf(stderr, "perf trace started with Perl script %s\n\n", script);
-
return 0;
+error:
+ perl_free(my_perl);
+ free(command_line);
+
+ return err;
}

/*
@@ -579,7 +593,9 @@ static void print_unsupported_msg(void)
"\n etc.\n");
}

-static int perl_start_script_unsupported(const char *script __unused)
+static int perl_start_script_unsupported(const char *script __unused,
+ int argc __unused,
+ const char **argv __unused)
{
print_unsupported_msg();

diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 81698d5..6ad4056 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -270,7 +270,7 @@ enum trace_flag_type {

struct scripting_ops {
const char *name;
- int (*start_script) (const char *);
+ int (*start_script) (const char *script, int argc, const char **argv);
int (*stop_script) (void);
void (*process_event) (int cpu, void *data, int size,
unsigned long long nsecs, char *comm);