cnt.c

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/*
 * Copyright (c) 2011-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */


#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <math.h>

#include "motr/magic.h"
#include "desim/sim.h"
#include "desim/cnt.h"

M0_TL_DESCR_DEFINE(cnts, "counters", static, struct cnt,
                   c_linkage, c_magic, M0_DESIM_CNT_MAGIC,
                   M0_DESIM_CNTS_HEAD_MAGIC);
M0_TL_DEFINE(cnts, static, struct cnt);

static struct m0_tl cnts;

M0_INTERNAL void cnt_init(struct cnt *cnt, struct cnt *parent,
                          const char *format, ...)
{
        va_list valist;

        memset(cnt, 0, sizeof *cnt);
        cnt->c_min = ~0ULL;
        cnt->c_max = 0;
        va_start(valist, format);
        sim_name_vaset(&cnt->c_name, format, valist);
        va_end(valist);
        cnt->c_parent = parent;
        cnts_tlink_init_at_tail(cnt, &cnts);
}

M0_INTERNAL void cnt_dump(struct cnt *cnt)
{
        cnt_t  avg;
        double sig;

        if (cnt->c_nr != 0) {
                avg = cnt->c_sum / cnt->c_nr;
                sig = sqrt(cnt->c_sq/cnt->c_nr - avg*avg);
                sim_log(NULL, SLL_INFO, "[%s: %llu (%llu) %llu %llu %f]\n",
                        cnt->c_name, avg, cnt->c_nr,
                        cnt->c_min, cnt->c_max, sig);
        } else
                sim_log(NULL, SLL_INFO, "[%s: empty]\n", cnt->c_name);
}

M0_INTERNAL void cnt_dump_all(void)
{
        struct cnt *scan;

        m0_tl_for(cnts, &cnts, scan)
                cnt_dump(scan);
        m0_tl_endfor;
}

M0_INTERNAL void cnt_fini(struct cnt *cnt)
{
        if (cnt->c_name != NULL)
                free(cnt->c_name);
        cnts_tlink_del_fini(cnt);
        cnt->c_magic = 0;
}


M0_INTERNAL void cnt_mod(struct cnt *cnt, cnt_t val)
{
        do {
                cnt->c_sum += val;
                cnt->c_nr++;
                cnt->c_sq += val*val;
                if (val > cnt->c_max)
                        cnt->c_max = val;
                if (val < cnt->c_min)
                        cnt->c_min = val;
        } while ((cnt = cnt->c_parent) != NULL);
}

M0_INTERNAL void cnt_global_init(void)
{
        cnts_tlist_init(&cnts);
}

M0_INTERNAL void cnt_global_fini(void)
{
        struct cnt *scan;

        m0_tl_for(cnts, &cnts, scan)
                cnt_fini(scan);
        m0_tl_endfor;

        cnts_tlist_fini(&cnts);
}

/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */