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/*

 * Copyright (C) 2010 B Labs Ltd.

 *

 * l4_getid performance tests

 *

 * Author: Bahadir Balban

 */

#include <l4lib/macros.h>

#include L4LIB_INC_ARCH(syslib.h)

#include L4LIB_INC_ARCH(syscalls.h)

#include <l4lib/lib/thread.h>

#include <l4lib/perfmon.h>

#include <perf.h>

#include <tests.h>

#include <string.h>

#include <timer.h>

struct perfmon_cycles l4_getid_cycles;

#define PERFTEST_GETID_COUNT            100

/*

 * Measure l4_getid by timer ticks

 */

void perf_measure_getid_ticks(void)

{

        const int timer_ldval = 0xFFFFFFFF;

        unsigned int timer_val, timer_stamp = 0xFFFFFFFF;

        unsigned int min = ~0, max = 0, last = 0, total = 0, ops = 0;

        struct task_ids ids;

        /* Make sure timer is disabled */

        timer_stop(timer_base);

        /* Configure timer as one shot */

        timer_init_oneshot(timer_base);

        /* Load the timer with ticks value */

        timer_load(timer_ldval, timer_base);

        /* Start the timer */

        printf("Starting the l4_getid timer tick test.\n");

        timer_start(timer_base);

        /* Do the operation */

        for (int i = 0; i < PERFTEST_GETID_COUNT; i++) {

                l4_getid(&ids);

                timer_val = timer_read(timer_base);

                last = timer_stamp - timer_val;

                timer_stamp = timer_val;

                if (min > last)

                        min = last;

                if (max < last)

                        max = last;

                ops++;

                total += last;

        }

        printf("TIMER: l4_getid took each %u min, %u max, %u avg,\n"

               "%u total microseconds, and %u total ops\n", min,

               max, total/ops, total, ops);

}

/*

 * Measure l4_getid by cpu cycles

 */

void perf_measure_getid(void)

{

        struct task_ids ids;

        /*

         * Initialize structures

         */

        memset(&l4_getid_cycles, 0, sizeof (l4_getid_cycles));

        l4_getid_cycles.min = ~0; /* Init as maximum possible */

        /*

         * Do the test

         */

        printf("Starting the l4_getid cycle counter test.\n");

        for (int i = 0; i < PERFTEST_GETID_COUNT; i++) {

                perfmon_reset_start_cyccnt();

                l4_getid(&ids);

                perfmon_record_cycles(&l4_getid_cycles,

                                      "l4_getid");

        }

        /*

         * Calculate average

         */

        l4_getid_cycles.avg = l4_getid_cycles.total / l4_getid_cycles.ops;

        /*

         * Print results

         */

        printf("PERFMON: %s took %llu min, %llu max, %llu avg, "

               "%llu total microseconds in %llu ops.\n",

               "l4_getid()",

               l4_getid_cycles.min * USEC_MULTIPLIER,

               l4_getid_cycles.max * USEC_MULTIPLIER,

               l4_getid_cycles.avg * USEC_MULTIPLIER,

               l4_getid_cycles.total * USEC_MULTIPLIER,

               l4_getid_cycles.ops);

}