[PATCH v2 6/8] libperf: Add perf_evsel__{refresh, period}() functions

Charlie Jenkins
2024-07-29T16:46:16Z

Add the following functions:

perf_evsel__refresh()
perf_evsel__period()

to set the over flow limit and period.

Signed-off-by: Shunsuke Nakamura <nakamura.shun@fujitsu.com>
Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
tools/lib/perf/Documentation/libperf.txt | 2 ++
tools/lib/perf/evsel.c | 46 ++++++++++++++++++++++++++------
tools/lib/perf/include/perf/evsel.h | 2 ++
tools/lib/perf/libperf.map | 2 ++
4 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/tools/lib/perf/Documentation/libperf.txt b/tools/lib/perf/Documentation/libperf.txt
index f1bfe6b6e78a..aac764e63db6 100644
--- a/tools/lib/perf/Documentation/libperf.txt
+++ b/tools/lib/perf/Documentation/libperf.txt
@@ -162,6 +162,8 @@ SYNOPSIS
int perf_evsel__disable(struct perf_evsel *evsel);
int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
bool perf_evsel__has_fd(struct perf_evsel *evsel, int fd);
+ int perf_evsel__refresh(struct perf_evsel *evsel, int refresh);
+ int perf_evsel__period(struct perf_evsel *evsel, int period);
struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel);
struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel);
struct perf_event_attr *perf_evsel__attr(struct perf_evsel *evsel);
diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c
index 6b98cba6eb4f..063498fc52f2 100644
--- a/tools/lib/perf/evsel.c
+++ b/tools/lib/perf/evsel.c
@@ -418,7 +418,7 @@ int perf_evsel__read(struct perf_evsel *evsel, int cpu_map_idx, int thread,
return 0;
}

-static int perf_evsel__ioctl(struct perf_evsel *evsel, int ioc, void *arg,
+static int perf_evsel__ioctl(struct perf_evsel *evsel, int ioc, unsigned long arg,
int cpu_map_idx, int thread)
{
int *fd = FD(evsel, cpu_map_idx, thread);
@@ -430,7 +430,7 @@ static int perf_evsel__ioctl(struct perf_evsel *evsel, int ioc, void *arg,
}

static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
- int ioc, void *arg,
+ int ioc, unsigned long arg,
int cpu_map_idx)
{
int thread;
@@ -447,7 +447,7 @@ static int perf_evsel__run_ioctl(struct perf_evsel *evsel,

int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx)
{
- return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu_map_idx);
+ return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0, cpu_map_idx);
}

int perf_evsel__enable_thread(struct perf_evsel *evsel, int thread)
@@ -457,7 +457,7 @@ int perf_evsel__enable_thread(struct perf_evsel *evsel, int thread)
int err;

perf_cpu_map__for_each_cpu(cpu, idx, evsel->cpus) {
- err = perf_evsel__ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, idx, thread);
+ err = perf_evsel__ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0, idx, thread);
if (err)
return err;
}
@@ -471,13 +471,13 @@ int perf_evsel__enable(struct perf_evsel *evsel)
int err = 0;

for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
- err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, i);
+ err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0, i);
return err;
}

int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx)
{
- return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, cpu_map_idx);
+ return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, 0, cpu_map_idx);
}

int perf_evsel__disable(struct perf_evsel *evsel)
@@ -486,7 +486,37 @@ int perf_evsel__disable(struct perf_evsel *evsel)
int err = 0;

for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
- err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, NULL, i);
+ err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, 0, i);
+ return err;
+}
+
+int perf_evsel__refresh(struct perf_evsel *evsel, int refresh)
+{
+ int i;
+ int err = 0;
+
+ for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
+ err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_REFRESH, refresh, i);
+ return err;
+}
+
+int perf_evsel__period(struct perf_evsel *evsel, __u64 period)
+{
+ struct perf_event_attr *attr;
+ int i;
+ int err = 0;
+
+ attr = perf_evsel__attr(evsel);
+
+ for (i = 0; i < xyarray__max_x(evsel->fd); i++) {
+ err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_PERIOD,
+ (unsigned long)&period, i);
+ if (err)
+ return err;
+ }
+
+ attr->sample_period = period;
+
return err;
}

@@ -497,7 +527,7 @@ int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
for (i = 0; i < perf_cpu_map__nr(evsel->cpus) && !err; i++)
err = perf_evsel__run_ioctl(evsel,
PERF_EVENT_IOC_SET_FILTER,
- (void *)filter, i);
+ (unsigned long)filter, i);
return err;
}

diff --git a/tools/lib/perf/include/perf/evsel.h b/tools/lib/perf/include/perf/evsel.h
index 77816a35c383..613a63790346 100644
--- a/tools/lib/perf/include/perf/evsel.h
+++ b/tools/lib/perf/include/perf/evsel.h
@@ -63,6 +63,8 @@ LIBPERF_API int perf_evsel__enable(struct perf_evsel *evsel);
LIBPERF_API int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
LIBPERF_API int perf_evsel__enable_thread(struct perf_evsel *evsel, int thread);
LIBPERF_API int perf_evsel__disable(struct perf_evsel *evsel);
+LIBPERF_API int perf_evsel__refresh(struct perf_evsel *evsel, int refresh);
+LIBPERF_API int perf_evsel__period(struct perf_evsel *evsel, __u64 period);
LIBPERF_API int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
LIBPERF_API struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel);
LIBPERF_API struct perf_thread_map *perf_evsel__threads(struct perf_evsel *evsel);
diff --git a/tools/lib/perf/libperf.map b/tools/lib/perf/libperf.map
index f68519e17885..12bdf2f43993 100644
--- a/tools/lib/perf/libperf.map
+++ b/tools/lib/perf/libperf.map
@@ -35,6 +35,8 @@ LIBPERF_0.0.1 {
perf_evsel__munmap;
perf_evsel__mmap_base;
perf_evsel__read;
+ perf_evsel__refresh;
+ perf_evsel__period;
perf_evsel__cpus;
perf_evsel__threads;
perf_evsel__attr;

--
2.44.0