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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/resource.h>
#include <config.h>
#include "common/slab/alloc-common.h"
int mreserve(char **p, size_t tlen, size_t min, size_t allow, size_t *reserved)
{
/* Trim excessive memory if possible. */
size_t maxlen = min + allow;
if (maxlen < min) {
return -2; /* size_t overflow */
}
/* Meet target size but trim excessive amounts. */
if (*reserved < min || *reserved > maxlen) {
void *trimmed = realloc(*p, maxlen * tlen);
if (trimmed != NULL) {
*p = trimmed;
*reserved = maxlen;
} else {
return -1;
}
}
return 0;
}
#ifdef MEM_DEBUG
/*
* ((destructor)) attribute executes this function after main().
* \see http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
*/
void __attribute__ ((destructor)) usage_dump()
#else
void usage_dump()
#endif
{
/* Get resource usage. */
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage) < 0) {
memset(&usage, 0, sizeof(struct rusage));
}
fprintf(stderr, "\nMemory statistics:");
fprintf(stderr, "\n==================\n");
fprintf(stderr, "User time: %.03lf ms\nSystem time: %.03lf ms\n",
usage.ru_utime.tv_sec * (double) 1000.0
+ usage.ru_utime.tv_usec / (double)1000.0,
usage.ru_stime.tv_sec * (double) 1000.0
+ usage.ru_stime.tv_usec / (double)1000.0);
fprintf(stderr, "Major page faults: %lu (required I/O)\nMinor page faults: %lu\n",
usage.ru_majflt, usage.ru_minflt);
fprintf(stderr, "Number of swaps: %lu\n",
usage.ru_nswap);
fprintf(stderr, "Voluntary context switches: %lu\nInvoluntary context switches: %lu\n",
usage.ru_nvcsw,
usage.ru_nivcsw);
fprintf(stderr, "==================\n");
}
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