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Date: Mon, 22 Feb 2010 01:12:59 -0600
From: Tom Zanussi <tzanussi@...il.com>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: linux-kernel@...r.kernel.org, mingo@...e.hu, rostedt@...dmis.org,
k-keiichi@...jp.nec.com
Subject: Re: [PATCH 06/12] perf trace/scripting: add Python scripting engine
On Mon, 2010-02-22 at 03:27 +0100, Frederic Weisbecker wrote:
> On Wed, Jan 27, 2010 at 02:27:57AM -0600, Tom Zanussi wrote:
> > +static void define_value(enum print_arg_type field_type,
> > + const char *ev_name,
> > + const char *field_name,
> > + const char *field_value,
> > + const char *field_str)
> > +{
> > + const char *handler_name = "define_flag_value";
> > + PyObject *handler, *t, *retval;
> > + unsigned long long value;
> > + unsigned n = 0;
> > +
> > + if (field_type == PRINT_SYMBOL)
> > + handler_name = "define_symbolic_value";
> > +
> > + t = PyTuple_New(MAX_FIELDS);
> > + if (!t)
> > + Py_FatalError("couldn't create Python tuple");
> > +
> > + value = eval_flag(field_value);
> > +
> > + PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
> > + PyTuple_SetItem(t, n++, PyString_FromString(field_name));
> > + PyTuple_SetItem(t, n++, PyInt_FromLong(value));
> > + PyTuple_SetItem(t, n++, PyString_FromString(field_str));
> > +
> > + if (_PyTuple_Resize(&t, n) == -1)
> > + Py_FatalError("error resizing Python tuple");
>
>
>
> Why are creating a tuple of 64 fields while you are always using
> 4?
>
>
>
> > +
> > + handler = PyDict_GetItemString(main_dict, handler_name);
> > + if (handler && PyCallable_Check(handler)) {
> > + retval = PyObject_CallObject(handler, t);
> > + if (retval == NULL)
> > + handler_call_die(handler_name);
> > + }
> > +
> > + Py_DECREF(t);
> > +}
> > +
> > +
>
> [...]
>
> > +static void define_field(enum print_arg_type field_type,
> > + const char *ev_name,
> > + const char *field_name,
> > + const char *delim)
> > +{
> > + const char *handler_name = "define_flag_field";
> > + PyObject *handler, *t, *retval;
> > + unsigned n = 0;
> > +
> > + if (field_type == PRINT_SYMBOL)
> > + handler_name = "define_symbolic_field";
> > +
> > + t = PyTuple_New(MAX_FIELDS);
> > + if (!t)
> > + Py_FatalError("couldn't create Python tuple");
> > +
> > + PyTuple_SetItem(t, n++, PyString_FromString(ev_name));
> > + PyTuple_SetItem(t, n++, PyString_FromString(field_name));
> > + if (field_type == PRINT_FLAGS)
> > + PyTuple_SetItem(t, n++, PyString_FromString(delim));
> > +
> > + if (_PyTuple_Resize(&t, n) == -1)
> > + Py_FatalError("error resizing Python tuple");
>
>
>
> Same here (except you may or may not have a PRINT_FLAGS type).
>
Good point - no reason to resize if we don't have to. Here's a patch to
change that.
Thanks,
Tom
[PATCH] perf trace/scripting: remove unnecessary PyTuple resizes
If we know the size of a tuple in advance, there's no need to resize
it - start out with the known size in the first place.
Signed-off-by: Tom Zanussi <tzanussi@...il.com>
---
.../util/scripting-engines/trace-event-python.c | 13 +++++--------
1 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index d402f64..33a414b 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -68,7 +68,7 @@ static void define_value(enum print_arg_type field_type,
if (field_type == PRINT_SYMBOL)
handler_name = "define_symbolic_value";
- t = PyTuple_New(MAX_FIELDS);
+ t = PyTuple_New(4);
if (!t)
Py_FatalError("couldn't create Python tuple");
@@ -79,9 +79,6 @@ static void define_value(enum print_arg_type field_type,
PyTuple_SetItem(t, n++, PyInt_FromLong(value));
PyTuple_SetItem(t, n++, PyString_FromString(field_str));
- if (_PyTuple_Resize(&t, n) == -1)
- Py_FatalError("error resizing Python tuple");
-
handler = PyDict_GetItemString(main_dict, handler_name);
if (handler && PyCallable_Check(handler)) {
retval = PyObject_CallObject(handler, t);
@@ -116,7 +113,10 @@ static void define_field(enum print_arg_type field_type,
if (field_type == PRINT_SYMBOL)
handler_name = "define_symbolic_field";
- t = PyTuple_New(MAX_FIELDS);
+ if (field_type == PRINT_FLAGS)
+ t = PyTuple_New(3);
+ else
+ t = PyTuple_New(2);
if (!t)
Py_FatalError("couldn't create Python tuple");
@@ -125,9 +125,6 @@ static void define_field(enum print_arg_type field_type,
if (field_type == PRINT_FLAGS)
PyTuple_SetItem(t, n++, PyString_FromString(delim));
- if (_PyTuple_Resize(&t, n) == -1)
- Py_FatalError("error resizing Python tuple");
-
handler = PyDict_GetItemString(main_dict, handler_name);
if (handler && PyCallable_Check(handler)) {
retval = PyObject_CallObject(handler, t);
--
1.6.4.GIT
--
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