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perf scripting python: Add function to get a config value

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This can be used to get config values like which objdump Perf uses for
disassembly.

Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Tested-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Cc: Ben Gainey <ben.gainey@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Ruidong Tian <tianruidong@linux.alibaba.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Benjamin Gray <bgray@linux.ibm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: coresight@lists.linaro.org
Cc: John Garry <john.g.garry@oracle.com>
Cc: scclevenger@os.amperecomputing.com
Link: https://lore.kernel.org/r/20240916135743.1490403-4-james.clark@linaro.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
James Clark 2024-09-16 14:57:34 +01:00 • committed by Namhyung Kim
parent ba5ae78a5a
commit 9943581c64
4 changed files with 35 additions and 1 deletions
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2
tools/perf/Documentation/perf-script-python.txt
View file

@ -624,7 +624,7 @@ as perf_trace_context.perf_script_context .
perf_set_itrace_options(context, itrace_options) - set --itrace options if they have not been set already
perf_sample_srcline(context) - returns source_file_name, line_number
perf_sample_srccode(context) - returns source_file_name, line_number, source_line
perf_config_get(config_name) - returns the value of the named config item, or None if unset
Util.py Module
~~~~~~~~~~~~~~

11
tools/perf/scripts/python/Perf-Trace-Util/Context.c
View file

@ -12,6 +12,7 @@
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "../../../util/config.h"
#include "../../../util/trace-event.h"
#include "../../../util/event.h"
#include "../../../util/symbol.h"
@ -182,6 +183,15 @@ static PyObject *perf_sample_srccode(PyObject *obj, PyObject *args)
return perf_sample_src(obj, args, true);
}
static PyObject *__perf_config_get(PyObject *obj, PyObject *args)
{
const char *config_name;
if (!PyArg_ParseTuple(args, "s", &config_name))
return NULL;
return Py_BuildValue("s", perf_config_get(config_name));
}
static PyMethodDef ContextMethods[] = {
#ifdef HAVE_LIBTRACEEVENT
{ "common_pc", perf_trace_context_common_pc, METH_VARARGS,
@ -199,6 +209,7 @@ static PyMethodDef ContextMethods[] = {
METH_VARARGS, "Get source file name and line number."},
{ "perf_sample_srccode", perf_sample_srccode,
METH_VARARGS, "Get source file name, line number and line."},
{ "perf_config_get", __perf_config_get, METH_VARARGS, "Get perf config entry"},
{ NULL, NULL, 0, NULL}
};

22
tools/perf/util/config.c
View file

@ -912,6 +912,7 @@ void set_buildid_dir(const char *dir)
struct perf_config_scan_data {
const char *name;
const char *fmt;
const char *value;
va_list args;
int ret;
};
@ -939,3 +940,24 @@ int perf_config_scan(const char *name, const char *fmt, ...)
return d.ret;
}
static int perf_config_get_cb(const char *var, const char *value, void *data)
{
struct perf_config_scan_data *d = data;
if (!strcmp(var, d->name))
d->value = value;
return 0;
}
const char *perf_config_get(const char *name)
{
struct perf_config_scan_data d = {
.name = name,
.value = NULL,
};
perf_config(perf_config_get_cb, &d);
return d.value;
}

1
tools/perf/util/config.h
View file

@ -30,6 +30,7 @@ typedef int (*config_fn_t)(const char *, const char *, void *);
int perf_default_config(const char *, const char *, void *);
int perf_config(config_fn_t fn, void *);
int perf_config_scan(const char *name, const char *fmt, ...) __scanf(2, 3);
const char *perf_config_get(const char *name);
int perf_config_set(struct perf_config_set *set,
config_fn_t fn, void *data);
int perf_config_int(int *dest, const char *, const char *);