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#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/time.h>
#include "pagingtest.h"
int pageinout_test(int test_runs, unsigned long long file_size) {
int fd;
char tmpname[] = "pageinoutXXXXXX";
unsigned char *vec;
int i;
long long j;
volatile char *buf;
int ret = -1;
int rc;
struct timeval begin_time, end_time, elapsed_time, total_time_in, total_time_out;
long pagesize = sysconf(_SC_PAGE_SIZE);
timerclear(&total_time_in);
timerclear(&total_time_out);
fd = create_tmp_file(tmpname, file_size);
if (fd < 0) {
return -1;
}
vec = alloc_mincore_vec(file_size);
if (vec == NULL) {
goto err_alloc;
}
buf = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (buf == ((void *)-1)) {
fprintf(stderr, "Failed to mmap file: %s\n", strerror(errno));
goto err_mmap;
}
if (!check_caching((void *)buf, vec, file_size, false)) {
goto err;
}
for (i = 0; i < test_runs; i++) {
gettimeofday(&begin_time, NULL);
//Read backwards to prevent mmap prefetching
for (j = ((file_size - 1) & ~(pagesize - 1)); j >= 0; j -= pagesize) {
buf[j];
}
gettimeofday(&end_time, NULL);
timersub(&end_time, &begin_time, &elapsed_time);
timeradd(&total_time_in, &elapsed_time, &total_time_in);
if (!check_caching((void *)buf, vec, file_size, true)) {
goto err;
}
gettimeofday(&begin_time, NULL);
rc = madvise((void *)buf, file_size, MADV_DONTNEED) ||
posix_fadvise(fd, 0, file_size, POSIX_FADV_DONTNEED);
gettimeofday(&end_time, NULL);
if (rc) {
fprintf(stderr, "posix_fadvise/madvise DONTNEED failed\n");
goto err;
}
timersub(&end_time, &begin_time, &elapsed_time);
timeradd(&total_time_out, &elapsed_time, &total_time_out);
if (!check_caching((void *)buf, vec, file_size, false)) {
goto err;
}
}
printf("page-in: %llu MB/s\n", (file_size * test_runs * USEC_PER_SEC) /
(1024 * 1024 * (total_time_in.tv_sec * USEC_PER_SEC + total_time_in.tv_usec)));
printf("page-out (clean): %llu MB/s\n", (file_size * test_runs * USEC_PER_SEC) /
(1024 * 1024 * (total_time_out.tv_sec * USEC_PER_SEC + total_time_out.tv_usec)));
ret = 0;
err:
munmap((void *)buf, file_size);
err_mmap:
free(vec);
err_alloc:
close(fd);
return ret;
}
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