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* Copyright (c) 2015 Nicira, Inc.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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/* This implementation only applies to the Linux platform. */
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#if defined(__linux__) && defined(HAVE_LINUX_PERF_EVENT_H)
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <linux/perf_event.h>
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#include <asm/unistd.h>
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#include "dynamic-string.h"
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#include "perf-counter.h"
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static struct shash perf_counters;
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perf_counter_read(uint64_t *counter)
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int size = sizeof *counter;
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if (fd__ <= 0 || read(fd__, counter, size) < size) {
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perf_event_open(struct perf_event_attr *hw_event, pid_t pid,
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int cpu, int group_fd, unsigned long flags)
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ret = syscall(__NR_perf_event_open, hw_event, pid, cpu,
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/* Set up perf event counters to read user space instruction counters
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* only for this process, on all cpus. */
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perf_event_setup(void)
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struct perf_event_attr pe;
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memset(&pe, 0, sizeof(struct perf_event_attr));
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pe.type = PERF_TYPE_HARDWARE;
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pe.size = sizeof(struct perf_event_attr);
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pe.config = PERF_COUNT_HW_INSTRUCTIONS;
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pe.exclude_kernel = 1;
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fd__ = perf_event_open(&pe, 0, -1, -1, 0);
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ioctl(fd__, PERF_EVENT_IOC_RESET, 0);
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ioctl(fd__, PERF_EVENT_IOC_ENABLE, 0);
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perf_counter_init(struct perf_counter *counter)
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shash_add_assert(&perf_counters, counter->name, counter);
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perf_counter_accumulate(struct perf_counter *counter, uint64_t start_count)
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perf_counter_init(counter);
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perf_counter_read(&end_count);
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counter->total_count += end_count - start_count;
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perf_counter_to_ds(struct ds *ds, struct perf_counter *pfc)
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ratio = (double)pfc->total_count / (double)pfc->n_events;
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ds_put_format(ds, "%-40s%12"PRIu64"%12"PRIu64"%12.1f\n",
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pfc->name, pfc->n_events, pfc->total_count, ratio);
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perf_counters_to_ds(struct ds *ds)
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const struct shash_node **sorted;
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err_str = "performance counter is not supported on this platfrom";
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} else if (!shash_count(&perf_counters)) {
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err_str = "performance counter has never been hit";
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ds_put_format(ds, "%s\n", err_str);
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/* Display counters in alphabetical order. */
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sorted = shash_sort(&perf_counters);
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for (i = 0; i < shash_count(&perf_counters); i++) {
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perf_counter_to_ds(ds, sorted[i]->data);
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* Caller is responsible for free memory.
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perf_counters_to_string()
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perf_counters_to_ds(&ds);
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return ds_steal_cstr(&ds);
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perf_counters_init(void)
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shash_init(&perf_counters);
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perf_counters_clear(void)
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struct shash_node *node;
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SHASH_FOR_EACH (node, &perf_counters) {
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struct perf_counter *perf = node->data;
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perf->total_count = 0;
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perf_counters_destroy()
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struct shash_node *node, *next;
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ioctl(fd__, PERF_EVENT_IOC_DISABLE, 0);
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SHASH_FOR_EACH_SAFE (node, next, &perf_counters) {
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shash_delete(&perf_counters, node);
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shash_destroy(&perf_counters);