@@ -18,6 +18,7 @@ OBJS += trace-filter-hash.o
OBJS += trace-msg.o
OBJS += trace-plugin.o
OBJS += trace-timesync.o
+OBJS += trace-perf.o
ifeq ($(VSOCK_DEFINED), 1)
OBJS += trace-timesync-ptp.o
OBJS += trace-timesync-kvm.o
@@ -8,6 +8,7 @@
#include <fcntl.h> /* for iovec */
#include <sys/types.h>
+#include <linux/perf_event.h> /* for perf types */
#include "traceevent/event-parse.h"
#include "trace-cmd/trace-cmd.h"
@@ -513,4 +514,17 @@ void *tracecmd_record_page(struct tracecmd_input *handle,
void *tracecmd_record_offset(struct tracecmd_input *handle,
struct tep_record *record);
+/* trace-cmd Perf */
+struct trace_perf {
+ int fd;
+ int cpu;
+ int pid;
+ int pages;
+ struct perf_event_attr pe;
+ struct perf_event_mmap_page *mmap;
+};
+int trace_perf_init(struct trace_perf *perf, int pages, int cpu, int pid);
+void trace_perf_close(struct trace_perf *perf);
+int trace_perf_open(struct trace_perf *perf);
+
#endif /* _TRACE_CMD_PRIVATE_H */
new file mode 100644
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ * Copyright (C) 2021, VMware, Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
+ *
+ */
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <sys/mman.h>
+
+#include "trace-cmd-private.h"
+
+static void default_perf_init_pe(struct perf_event_attr *pe)
+{
+ pe->type = PERF_TYPE_SOFTWARE;
+ pe->sample_type = PERF_SAMPLE_CPU;
+ pe->size = sizeof(struct perf_event_attr);
+ pe->config = PERF_COUNT_HW_CPU_CYCLES;
+ pe->disabled = 1;
+ pe->exclude_kernel = 1;
+ pe->freq = 1;
+ pe->sample_freq = 1000;
+ pe->inherit = 1;
+ pe->mmap = 1;
+ pe->comm = 1;
+ pe->task = 1;
+ pe->precise_ip = 1;
+ pe->sample_id_all = 1;
+ pe->read_format = PERF_FORMAT_ID |
+ PERF_FORMAT_TOTAL_TIME_ENABLED|
+ PERF_FORMAT_TOTAL_TIME_RUNNING;
+}
+
+/**
+ * trace_perf_init - Initialize perf context
+ *
+ * @perf: structure, representing perf context, that will be initialized.
+ * @pages: Number of perf memory mapped pages.
+ * @cpu: CPU number, associated with this perf context.
+ * @pid: PID, associated with this perf context.
+ *
+ * The perf context in initialized with default values. The caller can set
+ * custom perf parameters in perf->pe, before calling trace_perf_open() API.
+ *
+ * Returns 0 on success, or -1 in case of an error.
+ *
+ */
+int trace_perf_init(struct trace_perf *perf, int pages, int cpu, int pid)
+{
+ if (!perf)
+ return -1;
+
+ memset(perf, 0, sizeof(struct trace_perf));
+ default_perf_init_pe(&perf->pe);
+ perf->cpu = cpu;
+ perf->pages = pages;
+ perf->pid = pid;
+ perf->fd = -1;
+
+ return 0;
+}
+
+/**
+ * trace_perf_close - Close perf session
+ *
+ * @perf: structure, representing context of a running perf session, opened
+ * with trace_perf_open()
+ *
+ */
+void trace_perf_close(struct trace_perf *perf)
+{
+ if (perf->fd >= 0)
+ close(perf->fd);
+ perf->fd = -1;
+ if (perf->mmap)
+ munmap(perf->mmap, (perf->pages + 1) * getpagesize());
+ perf->mmap = NULL;
+}
+
+/**
+ * trace_perf_open - Open perf session
+ *
+ * @perf: structure, representing perf context that will be opened. It must be
+ * initialized with trace_perf_init().
+ *
+ * Returns 0 on success, or -1 in case of an error. In case of success, the
+ * session must be closed with trace_perf_close()
+ */
+int trace_perf_open(struct trace_perf *perf)
+{
+ perf->fd = syscall(__NR_perf_event_open, &perf->pe, perf->pid, perf->cpu, -1, 0);
+ if (perf->fd < 0)
+ return -1;
+ fcntl(perf->fd, F_SETFL, O_NONBLOCK);
+
+ perf->mmap = mmap(NULL, (perf->pages + 1) * getpagesize(),
+ PROT_READ | PROT_WRITE, MAP_SHARED, perf->fd, 0);
+ if (perf->mmap == MAP_FAILED)
+ goto error;
+
+ return 0;
+
+error:
+ trace_perf_close(perf);
+ return -1;
+}
Add new trace-cmd library internal APIs for working with perf. These initial APIs offer only basic functionality - init, open and close a perf session: trace_perf_init(); trace_perf_close(); trace_perf_open(); Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com> --- lib/trace-cmd/Makefile | 1 + .../include/private/trace-cmd-private.h | 14 +++ lib/trace-cmd/trace-perf.c | 105 ++++++++++++++++++ 3 files changed, 120 insertions(+) create mode 100644 lib/trace-cmd/trace-perf.c