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Subject[PATCH 21/47] perf evsel: Add support for enabling counters
Date
From: Andi Kleen <ak@linux.intel.com>

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>
---
tools/perf/util/evsel.c | 21 ++++++++++++++++++---
tools/perf/util/evsel.h | 1 +
2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8f10161..960394e 100644
--- 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
--- 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);
--
1.8.1.4


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