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perf counter lib convert to c++
This commit is contained in:
Daniel Agar
@@ -0,0 +1,631 @@
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/****************************************************************************
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*
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* Copyright (c) 2012-2016 PX4 Development Team. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/**
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* @file perf_counter.c
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*
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* @brief Performance measuring tools.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/queue.h>
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#include <drivers/drv_hrt.h>
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#include <math.h>
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#include <pthread.h>
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#include <systemlib/err.h>
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#include "perf_counter.h"
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/* latency histogram */
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const uint16_t latency_bucket_count = LATENCY_BUCKET_COUNT;
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const uint16_t latency_buckets[LATENCY_BUCKET_COUNT] = { 1, 2, 5, 10, 20, 50, 100, 1000 };
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__EXPORT uint32_t latency_counters[LATENCY_BUCKET_COUNT + 1];
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#ifdef __PX4_QURT
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// There is presumably no dprintf on QURT. Therefore use the usual output to mini-dm.
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#define dprintf(_fd, _text, ...) ((_fd) == 1 ? PX4_INFO((_text), ##__VA_ARGS__) : (void)(_fd))
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#endif
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/**
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* Header common to all counters.
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*/
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struct perf_ctr_header {
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sq_entry_t link; /**< list linkage */
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enum perf_counter_type type; /**< counter type */
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const char *name; /**< counter name */
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};
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/**
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* PC_EVENT counter.
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*/
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struct perf_ctr_count : public perf_ctr_header {
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uint64_t event_count{0};
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};
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/**
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* PC_ELAPSED counter.
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*/
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struct perf_ctr_elapsed : public perf_ctr_header {
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uint64_t event_count{0};
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uint64_t time_start{0};
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uint64_t time_total{0};
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uint32_t time_least{0};
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uint32_t time_most{0};
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float mean{0.0f};
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float M2{0.0f};
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};
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/**
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* PC_INTERVAL counter.
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*/
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struct perf_ctr_interval : public perf_ctr_header {
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uint64_t event_count{0};
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uint64_t time_event{0};
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uint64_t time_first{0};
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uint64_t time_last{0};
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uint32_t time_least{0};
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uint32_t time_most{0};
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float mean{0.0f};
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float M2{0.0f};
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};
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/**
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* List of all known counters.
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*/
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static sq_queue_t perf_counters = { nullptr, nullptr };
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/**
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* mutex protecting access to the perf_counters linked list (which is read from & written to by different threads)
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*/
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pthread_mutex_t perf_counters_mutex = PTHREAD_MUTEX_INITIALIZER;
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// FIXME: the mutex does **not** protect against access to/from the perf
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// counter's data. It can still happen that a counter is updated while it is
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// printed. This can lead to inconsistent output, or completely bogus values
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// (especially the 64bit values which are in general not atomically updated).
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// The same holds for shared perf counters (perf_alloc_once), that can be updated
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// concurrently (this affects the 'ctrl_latency' counter).
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perf_counter_t
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perf_alloc(enum perf_counter_type type, const char *name)
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{
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perf_counter_t ctr = nullptr;
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switch (type) {
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case PC_COUNT:
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ctr = new perf_ctr_count();
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break;
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case PC_ELAPSED:
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ctr = new perf_ctr_elapsed();
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break;
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case PC_INTERVAL:
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ctr = new perf_ctr_interval();
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break;
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default:
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break;
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}
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if (ctr != nullptr) {
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ctr->type = type;
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ctr->name = name;
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pthread_mutex_lock(&perf_counters_mutex);
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sq_addfirst(&ctr->link, &perf_counters);
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pthread_mutex_unlock(&perf_counters_mutex);
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}
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return ctr;
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}
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perf_counter_t
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perf_alloc_once(enum perf_counter_type type, const char *name)
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{
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pthread_mutex_lock(&perf_counters_mutex);
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perf_counter_t handle = (perf_counter_t)sq_peek(&perf_counters);
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while (handle != nullptr) {
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if (!strcmp(handle->name, name)) {
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if (type == handle->type) {
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/* they are the same counter */
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pthread_mutex_unlock(&perf_counters_mutex);
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return handle;
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} else {
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/* same name but different type, assuming this is an error and not intended */
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pthread_mutex_unlock(&perf_counters_mutex);
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return nullptr;
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}
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}
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handle = (perf_counter_t)sq_next(&handle->link);
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}
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pthread_mutex_unlock(&perf_counters_mutex);
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/* if the execution reaches here, no existing counter of that name was found */
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return perf_alloc(type, name);
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}
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void
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perf_free(perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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pthread_mutex_lock(&perf_counters_mutex);
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sq_rem(&handle->link, &perf_counters);
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pthread_mutex_unlock(&perf_counters_mutex);
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delete handle;
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}
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void
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perf_count(perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_COUNT:
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((struct perf_ctr_count *)handle)->event_count++;
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break;
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case PC_INTERVAL: {
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struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
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hrt_abstime now = hrt_absolute_time();
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switch (pci->event_count) {
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case 0:
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pci->time_first = now;
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break;
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case 1:
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pci->time_least = (uint32_t)(now - pci->time_last);
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pci->time_most = (uint32_t)(now - pci->time_last);
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pci->mean = pci->time_least / 1e6f;
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pci->M2 = 0;
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break;
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default: {
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hrt_abstime interval = now - pci->time_last;
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if ((uint32_t)interval < pci->time_least) {
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pci->time_least = (uint32_t)interval;
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}
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if ((uint32_t)interval > pci->time_most) {
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pci->time_most = (uint32_t)interval;
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}
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// maintain mean and variance of interval in seconds
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// Knuth/Welford recursive mean and variance of update intervals (via Wikipedia)
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float dt = interval / 1e6f;
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float delta_intvl = dt - pci->mean;
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pci->mean += delta_intvl / pci->event_count;
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pci->M2 += delta_intvl * (dt - pci->mean);
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break;
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}
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}
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pci->time_last = now;
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pci->event_count++;
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break;
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}
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default:
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break;
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}
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}
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void
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perf_begin(perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_ELAPSED:
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((struct perf_ctr_elapsed *)handle)->time_start = hrt_absolute_time();
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break;
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default:
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break;
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}
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}
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void
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perf_end(perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_ELAPSED: {
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struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
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if (pce->time_start != 0) {
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int64_t elapsed = hrt_absolute_time() - pce->time_start;
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if (elapsed >= 0) {
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pce->event_count++;
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pce->time_total += elapsed;
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if ((pce->time_least > (uint32_t)elapsed) || (pce->time_least == 0)) {
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pce->time_least = elapsed;
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}
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if (pce->time_most < (uint32_t)elapsed) {
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pce->time_most = elapsed;
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}
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// maintain mean and variance of the elapsed time in seconds
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// Knuth/Welford recursive mean and variance of update intervals (via Wikipedia)
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float dt = elapsed / 1e6f;
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float delta_intvl = dt - pce->mean;
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pce->mean += delta_intvl / pce->event_count;
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pce->M2 += delta_intvl * (dt - pce->mean);
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pce->time_start = 0;
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}
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}
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}
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break;
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default:
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break;
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}
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}
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void
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perf_set_elapsed(perf_counter_t handle, int64_t elapsed)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_ELAPSED: {
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struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
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if (elapsed >= 0) {
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pce->event_count++;
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pce->time_total += elapsed;
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if ((pce->time_least > (uint32_t)elapsed) || (pce->time_least == 0)) {
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pce->time_least = elapsed;
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}
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if (pce->time_most < (uint32_t)elapsed) {
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pce->time_most = elapsed;
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}
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// maintain mean and variance of the elapsed time in seconds
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// Knuth/Welford recursive mean and variance of update intervals (via Wikipedia)
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float dt = elapsed / 1e6f;
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float delta_intvl = dt - pce->mean;
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pce->mean += delta_intvl / pce->event_count;
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pce->M2 += delta_intvl * (dt - pce->mean);
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pce->time_start = 0;
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}
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}
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break;
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default:
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break;
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}
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}
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void
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perf_set_count(perf_counter_t handle, uint64_t count)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_COUNT: {
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((struct perf_ctr_count *)handle)->event_count = count;
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}
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break;
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default:
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break;
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}
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}
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void
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perf_cancel(perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_ELAPSED: {
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struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
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pce->time_start = 0;
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}
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break;
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default:
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break;
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}
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}
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void
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perf_reset(perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_COUNT:
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((struct perf_ctr_count *)handle)->event_count = 0;
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break;
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case PC_ELAPSED: {
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struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
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pce->event_count = 0;
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pce->time_start = 0;
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pce->time_total = 0;
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pce->time_least = 0;
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pce->time_most = 0;
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break;
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}
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case PC_INTERVAL: {
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struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
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pci->event_count = 0;
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pci->time_event = 0;
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pci->time_first = 0;
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pci->time_last = 0;
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pci->time_least = 0;
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pci->time_most = 0;
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break;
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}
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}
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}
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void
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perf_print_counter(perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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perf_print_counter_fd(1, handle);
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}
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void
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perf_print_counter_fd(int fd, perf_counter_t handle)
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{
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if (handle == nullptr) {
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return;
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}
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switch (handle->type) {
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case PC_COUNT:
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dprintf(fd, "%s: %llu events\n",
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handle->name,
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(unsigned long long)((struct perf_ctr_count *)handle)->event_count);
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break;
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||||
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case PC_ELAPSED: {
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struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
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float rms = sqrtf(pce->M2 / (pce->event_count - 1));
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dprintf(fd, "%s: %llu events, %lluus elapsed, %.2fus avg, min %lluus max %lluus %5.3fus rms\n",
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handle->name,
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(unsigned long long)pce->event_count,
|
||||
(unsigned long long)pce->time_total,
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(pce->event_count == 0) ? 0 : (double)pce->time_total / (double)pce->event_count,
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||||
(unsigned long long)pce->time_least,
|
||||
(unsigned long long)pce->time_most,
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||||
(double)(1e6f * rms));
|
||||
break;
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||||
}
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||||
|
||||
case PC_INTERVAL: {
|
||||
struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
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float rms = sqrtf(pci->M2 / (pci->event_count - 1));
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||||
dprintf(fd, "%s: %llu events, %.2fus avg, min %lluus max %lluus %5.3fus rms\n",
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||||
handle->name,
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||||
(unsigned long long)pci->event_count,
|
||||
(pci->event_count == 0) ? 0 : (double)(pci->time_last - pci->time_first) / (double)pci->event_count,
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||||
(unsigned long long)pci->time_least,
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(unsigned long long)pci->time_most,
|
||||
(double)(1e6f * rms));
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||||
break;
|
||||
}
|
||||
|
||||
default:
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||||
break;
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||||
}
|
||||
}
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||||
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||||
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||||
int
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||||
perf_print_counter_buffer(char *buffer, int length, perf_counter_t handle)
|
||||
{
|
||||
int num_written = 0;
|
||||
|
||||
if (handle == nullptr) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
switch (handle->type) {
|
||||
case PC_COUNT:
|
||||
num_written = snprintf(buffer, length, "%s: %llu events",
|
||||
handle->name,
|
||||
(unsigned long long)((struct perf_ctr_count *)handle)->event_count);
|
||||
break;
|
||||
|
||||
case PC_ELAPSED: {
|
||||
struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
|
||||
float rms = sqrtf(pce->M2 / (pce->event_count - 1));
|
||||
num_written = snprintf(buffer, length, "%s: %llu events, %lluus elapsed, %.2fus avg, min %lluus max %lluus %5.3fus rms",
|
||||
handle->name,
|
||||
(unsigned long long)pce->event_count,
|
||||
(unsigned long long)pce->time_total,
|
||||
(pce->event_count == 0) ? 0 : (double)pce->time_total / (double)pce->event_count,
|
||||
(unsigned long long)pce->time_least,
|
||||
(unsigned long long)pce->time_most,
|
||||
(double)(1e6f * rms));
|
||||
break;
|
||||
}
|
||||
|
||||
case PC_INTERVAL: {
|
||||
struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
|
||||
float rms = sqrtf(pci->M2 / (pci->event_count - 1));
|
||||
|
||||
num_written = snprintf(buffer, length, "%s: %llu events, %.2f avg, min %lluus max %lluus %5.3fus rms",
|
||||
handle->name,
|
||||
(unsigned long long)pci->event_count,
|
||||
(pci->event_count == 0) ? 0 : (double)(pci->time_last - pci->time_first) / (double)pci->event_count,
|
||||
(unsigned long long)pci->time_least,
|
||||
(unsigned long long)pci->time_most,
|
||||
(double)(1e6f * rms));
|
||||
break;
|
||||
}
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
buffer[length - 1] = 0; // ensure 0-termination
|
||||
return num_written;
|
||||
}
|
||||
|
||||
uint64_t
|
||||
perf_event_count(perf_counter_t handle)
|
||||
{
|
||||
if (handle == nullptr) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
switch (handle->type) {
|
||||
case PC_COUNT:
|
||||
return ((struct perf_ctr_count *)handle)->event_count;
|
||||
|
||||
case PC_ELAPSED: {
|
||||
struct perf_ctr_elapsed *pce = (struct perf_ctr_elapsed *)handle;
|
||||
return pce->event_count;
|
||||
}
|
||||
|
||||
case PC_INTERVAL: {
|
||||
struct perf_ctr_interval *pci = (struct perf_ctr_interval *)handle;
|
||||
return pci->event_count;
|
||||
}
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
perf_iterate_all(perf_callback cb, void *user)
|
||||
{
|
||||
pthread_mutex_lock(&perf_counters_mutex);
|
||||
perf_counter_t handle = (perf_counter_t)sq_peek(&perf_counters);
|
||||
|
||||
while (handle != nullptr) {
|
||||
cb(handle, user);
|
||||
handle = (perf_counter_t)sq_next(&handle->link);
|
||||
}
|
||||
|
||||
pthread_mutex_unlock(&perf_counters_mutex);
|
||||
}
|
||||
|
||||
void
|
||||
perf_print_all(int fd)
|
||||
{
|
||||
pthread_mutex_lock(&perf_counters_mutex);
|
||||
perf_counter_t handle = (perf_counter_t)sq_peek(&perf_counters);
|
||||
|
||||
while (handle != nullptr) {
|
||||
perf_print_counter_fd(fd, handle);
|
||||
handle = (perf_counter_t)sq_next(&handle->link);
|
||||
}
|
||||
|
||||
pthread_mutex_unlock(&perf_counters_mutex);
|
||||
}
|
||||
|
||||
void
|
||||
perf_print_latency(int fd)
|
||||
{
|
||||
dprintf(fd, "bucket [us] : events\n");
|
||||
|
||||
for (int i = 0; i < latency_bucket_count; i++) {
|
||||
dprintf(fd, " %4i : %li\n", latency_buckets[i], (long int)latency_counters[i]);
|
||||
}
|
||||
|
||||
// print the overflow bucket value
|
||||
dprintf(fd, " >%4i : %i\n", latency_buckets[latency_bucket_count - 1], latency_counters[latency_bucket_count]);
|
||||
}
|
||||
|
||||
void
|
||||
perf_reset_all(void)
|
||||
{
|
||||
pthread_mutex_lock(&perf_counters_mutex);
|
||||
perf_counter_t handle = (perf_counter_t)sq_peek(&perf_counters);
|
||||
|
||||
while (handle != nullptr) {
|
||||
perf_reset(handle);
|
||||
handle = (perf_counter_t)sq_next(&handle->link);
|
||||
}
|
||||
|
||||
pthread_mutex_unlock(&perf_counters_mutex);
|
||||
|
||||
for (int i = 0; i <= latency_bucket_count; i++) {
|
||||
latency_counters[i] = 0;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user