powerpc/benchmarks/mmap_bench.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
0004  */
0005
0006 #include <stdio.h>
0007 #include <stdlib.h>
0008 #include <sys/mman.h>
0009 #include <time.h>
0010 #include <getopt.h>
0011
0012 #include "utils.h"
0013
0014 #define ITERATIONS 5000000
0015
0016 #define MEMSIZE (1UL << 27)
0017 #define PAGE_SIZE (1UL << 16)
0018 #define CHUNK_COUNT (MEMSIZE/PAGE_SIZE)
0019
0020 static int pg_fault;
0021 static int iterations = ITERATIONS;
0022
0023 static struct option options[] = {
0024     { "pgfault", no_argument, &pg_fault, 1 },
0025     { "iterations", required_argument, 0, 'i' },
0026     { 0, },
0027 };
0028
0029 static void usage(void)
0030 {
0031     printf("mmap_bench <--pgfault> <--iterations count>\n");
0032 }
0033
0034 int test_mmap(void)
0035 {
0036     struct timespec ts_start, ts_end;
0037     unsigned long i = iterations;
0038
0039     clock_gettime(CLOCK_MONOTONIC, &ts_start);
0040
0041     while (i--) {
0042         char *c = mmap(NULL, MEMSIZE, PROT_READ|PROT_WRITE,
0043                    MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
0044         FAIL_IF(c == MAP_FAILED);
0045         if (pg_fault) {
0046             int count;
0047             for (count = 0; count < CHUNK_COUNT; count++)
0048                 c[count << 16] = 'c';
0049         }
0050         munmap(c, MEMSIZE);
0051     }
0052
0053     clock_gettime(CLOCK_MONOTONIC, &ts_end);
0054
0055     printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
0056
0057     return 0;
0058 }
0059
0060 int main(int argc, char *argv[])
0061 {
0062     signed char c;
0063     while (1) {
0064         int option_index = 0;
0065
0066         c = getopt_long(argc, argv, "", options, &option_index);
0067
0068         if (c == -1)
0069             break;
0070
0071         switch (c) {
0072         case 0:
0073             if (options[option_index].flag != 0)
0074                 break;
0075
0076             usage();
0077             exit(1);
0078             break;
0079         case 'i':
0080             iterations = atoi(optarg);
0081             break;
0082         default:
0083             usage();
0084             exit(1);
0085         }
0086     }
0087
0088     test_harness_set_timeout(300);
0089     return test_harness(test_mmap, "mmap_bench");
0090 }