perf evsel: Add support for enabling counters

Add support for enabling already set up counters by using an
ioctl. I share some code with the filter setup.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1375490473-1503-3-git-send-email-andi@firstfloor.org
[ Fixed up 'err' variable indentation ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8f10161..960394e 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -634,15 +634,15 @@ int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
        return evsel->fd != NULL ? 0 : -ENOMEM;
 }
 
-int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
-                          const char *filter)
+static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
+                         int ioc,  void *arg)
 {
        int cpu, thread;
 
        for (cpu = 0; cpu < ncpus; cpu++) {
                for (thread = 0; thread < nthreads; thread++) {
                        int fd = FD(evsel, cpu, thread),
-                           err = ioctl(fd, PERF_EVENT_IOC_SET_FILTER, filter);
+                           err = ioctl(fd, ioc, arg);
 
                        if (err)
                                return err;
@@ -652,6 +652,21 @@ int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
        return 0;
 }
 
+int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
+                          const char *filter)
+{
+       return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
+                                    PERF_EVENT_IOC_SET_FILTER,
+                                    (void *)filter);
+}
+
+int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
+{
+       return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
+                                    PERF_EVENT_IOC_ENABLE,
+                                    0);
+}
+
 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
 {
        evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 5edc625..532a5f9 100644 (file)
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -146,6 +146,7 @@ void perf_evsel__set_sample_id(struct perf_evsel *evsel);
 
 int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
                           const char *filter);
+int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads);
 
 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
                             struct cpu_map *cpus);