top.c

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/*
 * Copyright (c) 2010 Stanislav Kozina
 * Copyright (c) 2010 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <task.h>
#include <thread.h>
#include <sys/time.h>
#include <arch/barrier.h>
#include <errno.h>
#include <sort.h>
#include "screen.h"
#include "input.h"
#include "top.h"

#define NAME  "top"

#define UPDATE_INTERVAL  1

#define DAY     86400
#define HOUR    3600
#define MINUTE  60

op_mode_t op_mode = OP_TASKS;
sort_mode_t sort_mode = SORT_TASK_CYCLES;
bool excs_all = false;

static const char *read_data(data_t *target)
{
        /* Initialize data */
        target->load = NULL;
        target->cpus = NULL;
        target->cpus_perc = NULL;
        target->tasks = NULL;
        target->tasks_perc = NULL;
        target->tasks_map = NULL;
        target->threads = NULL;
        target->exceptions = NULL;
        target->exceptions_perc = NULL;
        target->physmem = NULL;
        target->ucycles_diff = NULL;
        target->kcycles_diff = NULL;
        target->ecycles_diff = NULL;
        target->ecount_diff = NULL;
        
        /* Get current time */
        struct timeval time;
        if (gettimeofday(&time, NULL) != EOK)
                return "Cannot get time of day";
        
        target->hours = (time.tv_sec % DAY) / HOUR;
        target->minutes = (time.tv_sec % HOUR) / MINUTE;
        target->seconds = time.tv_sec % MINUTE;
        
        /* Get uptime */
        sysarg_t uptime = stats_get_uptime();
        target->udays = uptime / DAY;
        target->uhours = (uptime % DAY) / HOUR;
        target->uminutes = (uptime % HOUR) / MINUTE;
        target->useconds = uptime % MINUTE;
        
        /* Get load */
        target->load = stats_get_load(&(target->load_count));
        if (target->load == NULL)
                return "Cannot get system load";
        
        /* Get CPUs */
        target->cpus = stats_get_cpus(&(target->cpus_count));
        if (target->cpus == NULL)
                return "Cannot get CPUs";
        
        target->cpus_perc =
            (perc_cpu_t *) calloc(target->cpus_count, sizeof(perc_cpu_t));
        if (target->cpus_perc == NULL)
                return "Not enough memory for CPU utilization";
        
        /* Get tasks */
        target->tasks = stats_get_tasks(&(target->tasks_count));
        if (target->tasks == NULL)
                return "Cannot get tasks";
        
        target->tasks_perc =
            (perc_task_t *) calloc(target->tasks_count, sizeof(perc_task_t));
        if (target->tasks_perc == NULL)
                return "Not enough memory for task utilization";
        
        target->tasks_map =
            (size_t *) calloc(target->tasks_count, sizeof(size_t));
        if (target->tasks_map == NULL)
                return "Not enough memory for task map";
        
        /* Get threads */
        target->threads = stats_get_threads(&(target->threads_count));
        if (target->threads == NULL)
                return "Cannot get threads";
        
        /* Get Exceptions */
        target->exceptions = stats_get_exceptions(&(target->exceptions_count));
        if (target->exceptions == NULL)
                return "Cannot get exceptions";
        
        target->exceptions_perc =
            (perc_exc_t *) calloc(target->exceptions_count, sizeof(perc_exc_t));
        if (target->exceptions_perc == NULL)
                return "Not enough memory for exception utilization";
        
        /* Get physical memory */
        target->physmem = stats_get_physmem();
        if (target->physmem == NULL)
                return "Cannot get physical memory";
        
        target->ucycles_diff = calloc(target->tasks_count,
            sizeof(uint64_t));
        if (target->ucycles_diff == NULL)
                return "Not enough memory for user utilization";
        
        /* Allocate memory for computed values */
        target->kcycles_diff = calloc(target->tasks_count,
            sizeof(uint64_t));
        if (target->kcycles_diff == NULL)
                return "Not enough memory for kernel utilization";
        
        target->ecycles_diff = calloc(target->exceptions_count,
            sizeof(uint64_t));
        if (target->ecycles_diff == NULL)
                return "Not enough memory for exception cycles utilization";
        
        target->ecount_diff = calloc(target->exceptions_count,
            sizeof(uint64_t));
        if (target->ecount_diff == NULL)
                return "Not enough memory for exception count utilization";
        
        return NULL;
}

static void compute_percentages(data_t *old_data, data_t *new_data)
{
        /* For each CPU: Compute total cycles and divide it between
           user and kernel */
        
        size_t i;
        for (i = 0; i < new_data->cpus_count; i++) {
                uint64_t idle =
                    new_data->cpus[i].idle_cycles - old_data->cpus[i].idle_cycles;
                uint64_t busy =
                    new_data->cpus[i].busy_cycles - old_data->cpus[i].busy_cycles;
                uint64_t sum = idle + busy;
                
                FRACTION_TO_FLOAT(new_data->cpus_perc[i].idle, idle * 100, sum);
                FRACTION_TO_FLOAT(new_data->cpus_perc[i].busy, busy * 100, sum);
        }
        
        /* For all tasks compute sum and differencies of all cycles */
        
        uint64_t virtmem_total = 0;
        uint64_t resmem_total = 0;
        uint64_t ucycles_total = 0;
        uint64_t kcycles_total = 0;
        
        for (i = 0; i < new_data->tasks_count; i++) {
                /* Match task with the previous instance */
                
                bool found = false;
                size_t j;
                for (j = 0; j < old_data->tasks_count; j++) {
                        if (new_data->tasks[i].task_id == old_data->tasks[j].task_id) {
                                found = true;
                                break;
                        }
                }
                
                if (!found) {
                        /* This is newly borned task, ignore it */
                        new_data->ucycles_diff[i] = 0;
                        new_data->kcycles_diff[i] = 0;
                        continue;
                }
                
                new_data->ucycles_diff[i] =
                    new_data->tasks[i].ucycles - old_data->tasks[j].ucycles;
                new_data->kcycles_diff[i] =
                    new_data->tasks[i].kcycles - old_data->tasks[j].kcycles;
                
                virtmem_total += new_data->tasks[i].virtmem;
                resmem_total += new_data->tasks[i].resmem;
                ucycles_total += new_data->ucycles_diff[i];
                kcycles_total += new_data->kcycles_diff[i];
        }
        
        /* For each task compute percential change */
        
        for (i = 0; i < new_data->tasks_count; i++) {
                FRACTION_TO_FLOAT(new_data->tasks_perc[i].virtmem,
                    new_data->tasks[i].virtmem * 100, virtmem_total);
                FRACTION_TO_FLOAT(new_data->tasks_perc[i].resmem,
                    new_data->tasks[i].resmem * 100, resmem_total);
                FRACTION_TO_FLOAT(new_data->tasks_perc[i].ucycles,
                    new_data->ucycles_diff[i] * 100, ucycles_total);
                FRACTION_TO_FLOAT(new_data->tasks_perc[i].kcycles,
                    new_data->kcycles_diff[i] * 100, kcycles_total);
        }
        
        /* For all exceptions compute sum and differencies of cycles */
        
        uint64_t ecycles_total = 0;
        uint64_t ecount_total = 0;
        
        for (i = 0; i < new_data->exceptions_count; i++) {
                /*
                 * March exception with the previous instance.
                 * This is quite paranoid since exceptions do not
                 * usually disappear, but it does not hurt.
                 */
                
                bool found = false;
                size_t j;
                for (j = 0; j < old_data->exceptions_count; j++) {
                        if (new_data->exceptions[i].id == old_data->exceptions[j].id) {
                                found = true;
                                break;
                        }
                }
                
                if (!found) {
                        /* This is a new exception, ignore it */
                        new_data->ecycles_diff[i] = 0;
                        new_data->ecount_diff[i] = 0;
                        continue;
                }
                
                new_data->ecycles_diff[i] =
                    new_data->exceptions[i].cycles - old_data->exceptions[j].cycles;
                new_data->ecount_diff[i] =
                    new_data->exceptions[i].count - old_data->exceptions[i].count;
                
                ecycles_total += new_data->ecycles_diff[i];
                ecount_total += new_data->ecount_diff[i];
        }
        
        /* For each exception compute percential change */
        
        for (i = 0; i < new_data->exceptions_count; i++) {
                FRACTION_TO_FLOAT(new_data->exceptions_perc[i].cycles,
                    new_data->ecycles_diff[i] * 100, ecycles_total);
                FRACTION_TO_FLOAT(new_data->exceptions_perc[i].count,
                    new_data->ecount_diff[i] * 100, ecount_total);
        }
}

static int cmp_data(void *a, void *b, void *arg)
{
        size_t ia = *((size_t *) a);
        size_t ib = *((size_t *) b);
        data_t *data = (data_t *) arg;
        
        uint64_t acycles = data->ucycles_diff[ia] + data->kcycles_diff[ia];
        uint64_t bcycles = data->ucycles_diff[ib] + data->kcycles_diff[ib];
        
        if (acycles > bcycles)
                return -1;
        
        if (acycles < bcycles)
                return 1;
        
        return 0;
}

static void sort_data(data_t *data)
{
        size_t i;
        
        for (i = 0; i < data->tasks_count; i++)
                data->tasks_map[i] = i;
        
        qsort((void *) data->tasks_map, data->tasks_count,
            sizeof(size_t), cmp_data, (void *) data);
}

static void free_data(data_t *target)
{
        if (target->load != NULL)
                free(target->load);
        
        if (target->cpus != NULL)
                free(target->cpus);
        
        if (target->cpus_perc != NULL)
                free(target->cpus_perc);
        
        if (target->tasks != NULL)
                free(target->tasks);
        
        if (target->tasks_perc != NULL)
                free(target->tasks_perc);
        
        if (target->threads != NULL)
                free(target->threads);
        
        if (target->exceptions != NULL)
                free(target->exceptions);
        
        if (target->exceptions_perc != NULL)
                free(target->exceptions_perc);
        
        if (target->physmem != NULL)
                free(target->physmem);
        
        if (target->ucycles_diff != NULL)
                free(target->ucycles_diff);
        
        if (target->kcycles_diff != NULL)
                free(target->kcycles_diff);
        
        if (target->ecycles_diff != NULL)
                free(target->ecycles_diff);
        
        if (target->ecount_diff != NULL)
                free(target->ecount_diff);
}

int main(int argc, char *argv[])
{
        data_t data;
        data_t data_prev;
        const char *ret = NULL;
        
        screen_init();
        printf("Reading initial data...\n");
        
        if ((ret = read_data(&data_prev)) != NULL)
                goto out;
        
        /* Compute some rubbish to have initialised values */
        compute_percentages(&data_prev, &data_prev);
        
        /* And paint screen until death */
        while (true) {
                int c = tgetchar(UPDATE_INTERVAL);
                if (c < 0) {
                        if ((ret = read_data(&data)) != NULL) {
                                free_data(&data);
                                goto out;
                        }
                        
                        compute_percentages(&data_prev, &data);
                        sort_data(&data);
                        print_data(&data);
                        free_data(&data_prev);
                        data_prev = data;
                        
                        continue;
                }
                
                switch (c) {
                        case 't':
                                print_warning("Showing task statistics");
                                op_mode = OP_TASKS;
                                break;
                        case 'i':
                                print_warning("Showing IPC statistics");
                                op_mode = OP_IPC;
                                break;
                        case 'e':
                                print_warning("Showing exception statistics");
                                op_mode = OP_EXCS;
                                break;
                        case 'h':
                                print_warning("Showing help");
                                op_mode = OP_HELP;
                                break;
                        case 'q':
                                goto out;
                        case 'a':
                                if (op_mode == OP_EXCS) {
                                        excs_all = !excs_all;
                                        if (excs_all)
                                                print_warning("Showing all exceptions");
                                        else
                                                print_warning("Showing only hot exceptions");
                                        break;
                                }
                        default:
                                print_warning("Unknown command \"%c\", use \"h\" for help", c);
                                break;
                }
        }
        
out:
        screen_done();
        free_data(&data_prev);
        
        if (ret != NULL) {
                fprintf(stderr, "%s: %s\n", NAME, ret);
                return 1;
        }
        
        return 0;
}

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