132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
/*
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* Copyright 2013, Michael Ellerman, IBM Corp.
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* Licensed under GPLv2.
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*/
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#define _GNU_SOURCE
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include "event.h"
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int perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu,
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int group_fd, unsigned long flags)
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{
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return syscall(__NR_perf_event_open, attr, pid, cpu,
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group_fd, flags);
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}
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void event_init_opts(struct event *e, u64 config, int type, char *name)
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{
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memset(e, 0, sizeof(*e));
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e->name = name;
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e->attr.type = type;
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e->attr.config = config;
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e->attr.size = sizeof(e->attr);
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/* This has to match the structure layout in the header */
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e->attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | \
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PERF_FORMAT_TOTAL_TIME_RUNNING;
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}
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void event_init_named(struct event *e, u64 config, char *name)
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{
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event_init_opts(e, config, PERF_TYPE_RAW, name);
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}
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void event_init(struct event *e, u64 config)
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{
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event_init_opts(e, config, PERF_TYPE_RAW, "event");
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}
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#define PERF_CURRENT_PID 0
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#define PERF_NO_PID -1
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#define PERF_NO_CPU -1
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#define PERF_NO_GROUP -1
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int event_open_with_options(struct event *e, pid_t pid, int cpu, int group_fd)
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{
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e->fd = perf_event_open(&e->attr, pid, cpu, group_fd, 0);
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if (e->fd == -1) {
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perror("perf_event_open");
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return -1;
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}
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return 0;
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}
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int event_open_with_group(struct event *e, int group_fd)
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{
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return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, group_fd);
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}
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int event_open_with_pid(struct event *e, pid_t pid)
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{
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return event_open_with_options(e, pid, PERF_NO_CPU, PERF_NO_GROUP);
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}
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int event_open_with_cpu(struct event *e, int cpu)
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{
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return event_open_with_options(e, PERF_NO_PID, cpu, PERF_NO_GROUP);
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}
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int event_open(struct event *e)
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{
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return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, PERF_NO_GROUP);
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}
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void event_close(struct event *e)
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{
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close(e->fd);
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}
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int event_enable(struct event *e)
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{
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return ioctl(e->fd, PERF_EVENT_IOC_ENABLE);
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}
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int event_disable(struct event *e)
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{
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return ioctl(e->fd, PERF_EVENT_IOC_DISABLE);
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}
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int event_reset(struct event *e)
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{
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return ioctl(e->fd, PERF_EVENT_IOC_RESET);
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}
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int event_read(struct event *e)
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{
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int rc;
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rc = read(e->fd, &e->result, sizeof(e->result));
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if (rc != sizeof(e->result)) {
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fprintf(stderr, "read error on event %p!\n", e);
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return -1;
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}
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return 0;
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}
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void event_report_justified(struct event *e, int name_width, int result_width)
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{
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printf("%*s: result %*llu ", name_width, e->name, result_width,
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e->result.value);
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if (e->result.running == e->result.enabled)
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printf("running/enabled %llu\n", e->result.running);
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else
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printf("running %llu enabled %llu\n", e->result.running,
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e->result.enabled);
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}
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void event_report(struct event *e)
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{
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event_report_justified(e, 0, 0);
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}
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