perf evlist: Introduce add_tracepoints method

Convenient way of asking for tracepoint events to be added to an
existing evlist.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-0ylj4wrg54791u0baqb9swbb@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 50d08e47
...@@ -6,12 +6,13 @@ ...@@ -6,12 +6,13 @@
* *
* Released under the GPL v2. (and only v2, not any later version) * Released under the GPL v2. (and only v2, not any later version)
*/ */
#include "util.h"
#include "debugfs.h"
#include <poll.h> #include <poll.h>
#include "cpumap.h" #include "cpumap.h"
#include "thread_map.h" #include "thread_map.h"
#include "evlist.h" #include "evlist.h"
#include "evsel.h" #include "evsel.h"
#include "util.h"
#include "parse-events.h" #include "parse-events.h"
...@@ -134,6 +135,60 @@ int perf_evlist__add_attrs(struct perf_evlist *evlist, ...@@ -134,6 +135,60 @@ int perf_evlist__add_attrs(struct perf_evlist *evlist,
return -1; return -1;
} }
static int trace_event__id(const char *evname)
{
char *filename, *colon;
int err = -1, fd;
if (asprintf(&filename, "%s/%s/id", tracing_events_path, evname) < 0)
return -1;
colon = strrchr(filename, ':');
if (colon != NULL)
*colon = '/';
fd = open(filename, O_RDONLY);
if (fd >= 0) {
char id[16];
if (read(fd, id, sizeof(id)) > 0)
err = atoi(id);
close(fd);
}
free(filename);
return err;
}
int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
const char *tracepoints[],
size_t nr_tracepoints)
{
int err;
size_t i;
struct perf_event_attr *attrs = zalloc(nr_tracepoints * sizeof(*attrs));
if (attrs == NULL)
return -1;
for (i = 0; i < nr_tracepoints; i++) {
err = trace_event__id(tracepoints[i]);
if (err < 0)
goto out_free_attrs;
attrs[i].type = PERF_TYPE_TRACEPOINT;
attrs[i].config = err;
attrs[i].sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
PERF_SAMPLE_CPU);
attrs[i].sample_period = 1;
}
err = perf_evlist__add_attrs(evlist, attrs, nr_tracepoints);
out_free_attrs:
free(attrs);
return err;
}
void perf_evlist__disable(struct perf_evlist *evlist) void perf_evlist__disable(struct perf_evlist *evlist)
{ {
int cpu, thread; int cpu, thread;
......
...@@ -43,10 +43,15 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry); ...@@ -43,10 +43,15 @@ void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry);
int perf_evlist__add_default(struct perf_evlist *evlist); int perf_evlist__add_default(struct perf_evlist *evlist);
int perf_evlist__add_attrs(struct perf_evlist *evlist, int perf_evlist__add_attrs(struct perf_evlist *evlist,
struct perf_event_attr *attrs, size_t nr_attrs); struct perf_event_attr *attrs, size_t nr_attrs);
int perf_evlist__add_tracepoints(struct perf_evlist *evlist,
const char *tracepoints[], size_t nr_tracepoints);
#define perf_evlist__add_attrs_array(evlist, array) \ #define perf_evlist__add_attrs_array(evlist, array) \
perf_evlist__add_attrs(evlist, array, ARRAY_SIZE(array)) perf_evlist__add_attrs(evlist, array, ARRAY_SIZE(array))
#define perf_evlist__add_tracepoints_array(evlist, array) \
perf_evlist__add_tracepoints(evlist, array, ARRAY_SIZE(array))
void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel, void perf_evlist__id_add(struct perf_evlist *evlist, struct perf_evsel *evsel,
int cpu, int thread, u64 id); int cpu, int thread, u64 id);
......
...@@ -27,7 +27,8 @@ build_tmp = getenv('PYTHON_EXTBUILD_TMP') ...@@ -27,7 +27,8 @@ build_tmp = getenv('PYTHON_EXTBUILD_TMP')
perf = Extension('perf', perf = Extension('perf',
sources = ['util/python.c', 'util/ctype.c', 'util/evlist.c', sources = ['util/python.c', 'util/ctype.c', 'util/evlist.c',
'util/evsel.c', 'util/cpumap.c', 'util/thread_map.c', 'util/evsel.c', 'util/cpumap.c', 'util/thread_map.c',
'util/util.c', 'util/xyarray.c', 'util/cgroup.c'], 'util/util.c', 'util/xyarray.c', 'util/cgroup.c',
'util/debugfs.c'],
include_dirs = ['util/include'], include_dirs = ['util/include'],
extra_compile_args = cflags, extra_compile_args = cflags,
) )
......
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