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Message-Id: <20250106-perf_set_event_limit-v3-3-dbde0e90ddde@rivosinc.com>
Date: Mon, 06 Jan 2025 20:07:34 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>, Atish Patra <atishp@...osinc.com>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
Charlie Jenkins <charlie@...osinc.com>,
Shunsuke Nakamura <nakamura.shun@...itsu.com>
Subject: [PATCH v3 3/3] libperf: Add perf_evsel__refresh() function
Introduce perf_evsel__refresh() to increment the overflow limit. Can
optionally enable the event immediately.
Co-developed-by: Shunsuke Nakamura <nakamura.shun@...itsu.com>
Signed-off-by: Shunsuke Nakamura <nakamura.shun@...itsu.com>
Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
tools/lib/perf/Documentation/libperf.txt | 2 ++
tools/lib/perf/evsel.c | 49 ++++++++++++++++++++++++++------
tools/lib/perf/include/perf/evsel.h | 2 ++
tools/lib/perf/libperf.map | 2 ++
4 files changed, 47 insertions(+), 8 deletions(-)
diff --git a/tools/lib/perf/Documentation/libperf.txt b/tools/lib/perf/Documentation/libperf.txt
index 59aabdd3cabff19c9a4835d9d20a74c6087d9a06..d557cb0279853c82dfc65533ba230255fced64bc 100644
--- a/tools/lib/perf/Documentation/libperf.txt
+++ b/tools/lib/perf/Documentation/libperf.txt
@@ -146,6 +146,8 @@ SYNOPSIS
int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
int perf_evsel__disable(struct perf_evsel *evsel);
int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
+ int perf_evsel__refresh(struct perf_evsel *evsel, int refresh, bool enable);
+ int perf_evsel__period(struct perf_evsel *evsel, uint64_t 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 c475319e2e410d31d072d81afb9e6277b16ef1f1..92633d426c9439afd7a8cde70dde8320d6a2efa3 100644
--- a/tools/lib/perf/evsel.c
+++ b/tools/lib/perf/evsel.c
@@ -19,6 +19,7 @@
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <asm/bug.h>
+#include "internal.h"
void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr,
int idx)
@@ -414,7 +415,7 @@ 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);
@@ -426,7 +427,7 @@ 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;
@@ -443,7 +444,7 @@ 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)
@@ -453,7 +454,7 @@ 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;
}
@@ -467,13 +468,13 @@ 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)
@@ -482,7 +483,39 @@ 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, bool enable)
+{
+ int i, ioc;
+ int err = 0;
+
+ ioc = enable ? PERF_EVENT_IOC_REFRESH : PERF_EVENT_IOC_INC_EVENT_LIMIT;
+
+ for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
+ err = perf_evsel__run_ioctl(evsel, ioc, refresh, i);
+ return err;
+}
+
+int perf_evsel__period(struct perf_evsel *evsel, uint64_t 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;
}
@@ -493,7 +526,7 @@ 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 6f92204075c244bc623b26dc2c97fa4c835a4228..19d30bab8fe1e2d860b432855bc01958ba5e54c8 100644
--- a/tools/lib/perf/include/perf/evsel.h
+++ b/tools/lib/perf/include/perf/evsel.h
@@ -40,6 +40,8 @@ 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, bool enable);
+LIBPERF_API int perf_evsel__period(struct perf_evsel *evsel, uint64_t 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 fdd8304fe9d05862376c122d68777a6bf6a03d80..d67299bd5216b02e09a47a1b1ef947eef460cf17 100644
--- a/tools/lib/perf/libperf.map
+++ b/tools/lib/perf/libperf.map
@@ -33,6 +33,8 @@ 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;
--
2.34.1
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