#define __SANE_USERSPACE_TYPES__ // Use ll64
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pthread.h>
#include <assert.h>
#include <mm/gup_test.h>
#include "../kselftest.h"
#include "vm_util.h"
#define MB (1UL << 20)
/* Just the flags we need, copied from mm.h: */
#define FOLL_WRITE 0x01 /* check pte is writable */
#define FOLL_TOUCH 0x02 /* mark page accessed */
#define GUP_TEST_FILE "/sys/kernel/debug/gup_test"
static unsigned long cmd = GUP_FAST_BENCHMARK;
static int gup_fd, repeats = 1;
static unsigned long size = 128 * MB;
/* Serialize prints */
static pthread_mutex_t print_mutex = PTHREAD_MUTEX_INITIALIZER;
static char *cmd_to_str(unsigned long cmd)
{
switch (cmd) {
case GUP_FAST_BENCHMARK:
return "GUP_FAST_BENCHMARK";
case PIN_FAST_BENCHMARK:
return "PIN_FAST_BENCHMARK";
case PIN_LONGTERM_BENCHMARK:
return "PIN_LONGTERM_BENCHMARK";
case GUP_BASIC_TEST:
return "GUP_BASIC_TEST";
case PIN_BASIC_TEST:
return "PIN_BASIC_TEST";
case DUMP_USER_PAGES_TEST:
return "DUMP_USER_PAGES_TEST";
}
return "Unknown command";
}
void *gup_thread(void *data)
{
struct gup_test gup = *(struct gup_test *)data;
int i, status;
/* Only report timing information on the *_BENCHMARK commands: */
if ((cmd == PIN_FAST_BENCHMARK) || (cmd == GUP_FAST_BENCHMARK) ||
(cmd == PIN_LONGTERM_BENCHMARK)) {
for (i = 0; i < repeats; i++) {
gup.size = size;
status = ioctl(gup_fd, cmd, &gup);
if (status)
break;
pthread_mutex_lock(&print_mutex);
ksft_print_msg("%s: Time: get:%lld put:%lld us",
cmd_to_str(cmd), gup.get_delta_usec,
gup.put_delta_usec);
if (gup.size != size)
ksft_print_msg(", truncated (size: %lld)", gup.size);
ksft_print_msg("\n");
pthread_mutex_unlock(&print_mutex);
}
} else {
gup.size = size;
status = ioctl(gup_fd, cmd, &gup);
if (status)
goto return_;
pthread_mutex_lock(&print_mutex);
ksft_print_msg("%s: done\n", cmd_to_str(cmd));
if (gup.size != size)
ksft_print_msg("Truncated (size: %lld)\n", gup.size);
pthread_mutex_unlock(&print_mutex);
}
return_:
ksft_test_result(!status, "ioctl status %d\n", status);
return NULL;
}
int main(int argc, char **argv)
{
struct gup_test gup = { 0 };
int filed, i, opt, nr_pages = 1, thp = -1, write = 1, nthreads = 1, ret;
int flags = MAP_PRIVATE, touch = 0;
char *file = "/dev/zero";
pthread_t *tid;
char *p;
while ((opt = getopt(argc, argv, "m:r:n:F:f:abcj:tTLUuwWSHpz")) != -1) {
switch (opt) {
case 'a':
cmd = PIN_FAST_BENCHMARK;
break;
case 'b':
cmd = PIN_BASIC_TEST;
break;
case 'L':
cmd = PIN_LONGTERM_BENCHMARK;
break;
case 'c':
cmd = DUMP_USER_PAGES_TEST;
/*
* Dump page 0 (index 1). May be overridden later, by
* user's non-option arguments.
*
* .which_pages is zero-based, so that zero can mean "do
* nothing".
*/
gup.which_pages[0] = 1;
break;
case 'p':
/* works only with DUMP_USER_PAGES_TEST */
gup.test_flags |= GUP_TEST_FLAG_DUMP_PAGES_USE_PIN;
break;
case 'F':
/* strtol, so you can pass flags in hex form */
gup.gup_flags = strtol(optarg, 0, 0);
break;
case 'j':
nthreads = atoi(optarg);
break;
case 'm':
size = atoi(optarg) * MB;
break;
case 'r':
repeats = atoi(optarg);
break;
case 'n':
nr_pages = atoi(optarg);
break;
case 't':
thp = 1;
break;
case 'T':
thp = 0;
break;
case 'U':
cmd = GUP_BASIC_TEST;
break;
case 'u':
cmd = GUP_FAST_BENCHMARK;
break;
case 'w':
write = 1;
break;
case 'W':
write = 0;
break;
case 'f':
file = optarg;
break;
case 'S':
flags &= ~MAP_PRIVATE;
flags |= MAP_SHARED;
break;
case 'H':
flags |= (MAP_HUGETLB | MAP_ANONYMOUS);
break;
case 'z':
/* fault pages in gup, do not fault in userland */
touch = 1;
break;
default:
ksft_exit_fail_msg("Wrong argument\n");
}
}
if (optind < argc) {
int extra_arg_count = 0;
/*
* For example:
*
* ./gup_test -c 0 1 0x1001
*
* ...to dump pages 0, 1, and 4097
*/
while ((optind < argc) &&
(extra_arg_count < GUP_TEST_MAX_PAGES_TO_DUMP)) {
/*
* Do the 1-based indexing here, so that the user can
* use normal 0-based indexing on the command line.
*/
long page_index = strtol(argv[optind], 0, 0) + 1;
gup.which_pages[extra_arg_count] = page_index;
extra_arg_count++;
optind++;
}
}
ksft_print_header();
ksft_set_plan(nthreads);
filed = open(file, O_RDWR|O_CREAT, 0664);
if (filed < 0)
ksft_exit_fail_msg("Unable to open %s: %s\n", file, strerror(errno));
gup.nr_pages_per_call = nr_pages;
if (write)
gup.gup_flags |= FOLL_WRITE;
gup_fd = open(GUP_TEST_FILE, O_RDWR);
if (gup_fd == -1) {
switch (errno) {
case EACCES:
if (getuid())
ksft_print_msg("Please run this test as root\n");
break;
case ENOENT:
if (opendir("/sys/kernel/debug") == NULL)
ksft_print_msg("mount debugfs at /sys/kernel/debug\n");
ksft_print_msg("check if CONFIG_GUP_TEST is enabled in kernel config\n");
break;
default:
ksft_print_msg("failed to open %s: %s\n", GUP_TEST_FILE, strerror(errno));
break;
}
ksft_test_result_skip("Please run this test as root\n");
ksft_exit_pass();
}
p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0);
if (p == MAP_FAILED)
ksft_exit_fail_msg("mmap: %s\n", strerror(errno));
gup.addr = (unsigned long)p;
if (thp == 1)
madvise(p, size, MADV_HUGEPAGE);
else if (thp == 0)
madvise(p, size, MADV_NOHUGEPAGE);
/*
* FOLL_TOUCH, in gup_test, is used as an either/or case: either
* fault pages in from the kernel via FOLL_TOUCH, or fault them
* in here, from user space. This allows comparison of performance
* between those two cases.
*/
if (touch) {
gup.gup_flags |= FOLL_TOUCH;
} else {
for (; (unsigned long)p < gup.addr + size; p += psize())
p[0] = 0;
}
tid = malloc(sizeof(pthread_t) * nthreads);
assert(tid);
for (i = 0; i < nthreads; i++) {
ret = pthread_create(&tid[i], NULL, gup_thread, &gup);
assert(ret == 0);
}
for (i = 0; i < nthreads; i++) {
ret = pthread_join(tid[i], NULL);
assert(ret == 0);
}
free(tid);
ksft_exit_pass();
}
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