contiki/core/sys/profile.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: profile.c,v 1.3 2007/11/18 19:16:49 oliverschmidt Exp $
*/
/**
* \file
* Implementation of the Contiki profiling system
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "sys/profile.h"
#include <stddef.h> /* For NULL */
unsigned int profile_timestamp_ptr;
struct profile_timestamp profile_timestamps[PROFILE_LIST_LENGTH];
rtimer_clock_t profile_timestamp_time;
int profile_invalid_episode_overflow, profile_invalid_episode_toolong;
int profile_max_queuelen = 0;
static rtimer_clock_t episode_start_time;
/* The number of fine grained ticks per coarse grained ticks. We
currently (MSP430) have 2457600 ticks per second for the fine
grained timer, and 32678 / 8 ticks per second for the coarse. */
#define FINE_TICKS_PER_COARSE_TICK (2457600/(32678/8))
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/* XXX hack: we use a function called clock_counter() that is not part
of the clock API and currently is only implemented for the
MSP430. We therefore declare this function here instead of in
dev/clock.h. */
rtimer_clock_t clock_counter(void);
/*---------------------------------------------------------------------------*/
rtimer_clock_t
profile_timediff(const char *ptr1, const char *ptr2)
{
int i;
int t1, t2;
int timestamp_ptr = PROFILE_TIMESTAMP_PTR;
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/* printf("profile_timestamp_ptr %d max %d\n", profile_timestamp_ptr, profile_max_queuelen);*/
t1 = t2 = PROFILE_LIST_LENGTH;
for(i = timestamp_ptr - 1; i >= 0; --i) {
/* printf("Checking 1 %s %u == %s i %d\n",
profile_timestamps[i].ptr,
profile_timestamps[i].time,
ptr1, i);*/
if(profile_timestamps[i].ptr == ptr1) {
t1 = i;
break;
}
}
for(i = i - 1; i >= 0; --i) {
/* printf("Checking 2 %s %u == %s i %d\n",
profile_timestamps[i].ptr,
profile_timestamps[i].time,
ptr1, i);*/
if(profile_timestamps[i].ptr == ptr2) {
t2 = i;
break;
}
}
/* printf("t1 %d t2 %d\n", t1, t2);*/
if(t1 != PROFILE_LIST_LENGTH && t2 != PROFILE_LIST_LENGTH) {
return profile_timestamps[t1].time - profile_timestamps[t2].time;
}
return 0;
}
/*---------------------------------------------------------------------------*/
void
profile_clear_timestamps(void)
{
/* int i;
for(i = 0; i < PROFILE_LIST_LENGTH; ++i) {
profile_timestamps[i].str = "NULL";
profile_timestamps[i].time = 0;
}*/
profile_timestamp_ptr = 0;
}
/*---------------------------------------------------------------------------*/
void
profile_init(void)
{
profile_clear_timestamps();
/* Measure the time for taking a timestamp. */
PROFILE_TIMESTAMP(NULL);
PROFILE_TIMESTAMP(NULL);
profile_timestamp_time = profile_timestamps[1].time - profile_timestamps[0].time;
profile_clear_timestamps();
}
/*---------------------------------------------------------------------------*/
void
profile_episode_start(void)
{
profile_timestamp_ptr = 0;
episode_start_time = clock_counter();
profile_timestamps[PROFILE_LIST_LENGTH - 1].ptr = NULL;
}
/*---------------------------------------------------------------------------*/
void
profile_episode_end(void)
{
rtimer_clock_t episode_end_time = clock_counter();
PROFILE_TIMESTAMP("profile_episode_end");
/* printf("profile_episode_end start %u, end %u, max time %u\n", episode_start_time, episode_end_time, 65536/FINE_TICKS_PER_COARSE_TICK); */
if(profile_timestamps[PROFILE_LIST_LENGTH - 1].ptr != NULL) {
/* Invalid episode because of list overflow. */
profile_invalid_episode_overflow++;
profile_max_queuelen = PROFILE_LIST_LENGTH;
} else if(episode_end_time - episode_start_time > 65536/FINE_TICKS_PER_COARSE_TICK) {
/* Invalid episode because of timer overflow. */
profile_invalid_episode_toolong++;
} else {
/* Compute aggregates. */
if(PROFILE_TIMESTAMP_PTR > profile_max_queuelen) {
profile_max_queuelen = PROFILE_TIMESTAMP_PTR;
}
profile_aggregates_compute();
/* printf("Episode length %d\n", profile_timestamp_ptr);*/
}
/* profile_aggregates_print(); */
/* profile_print_stats(); */
}
/*---------------------------------------------------------------------------*/
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#if 0
#include <stdio.h>
void
profile_print_stats(void)
{
printf("Memory for profiling: %d * %d = %d\n",
sizeof(struct profile_timestamp), profile_max_queuelen,
sizeof(struct profile_timestamp) * profile_max_queuelen);
printf("Invalid episodes overflow %d time %d\n",
profile_invalid_episode_overflow,
profile_invalid_episode_toolong);
}
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#endif /* 0 */
/*---------------------------------------------------------------------------*/