The gup benchmark by default maps anonymous memory. This patch allows a
user to specify a file to map, providing a means to test various
file backings, like device and filesystem DAX.
Cc: Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx>
---
tools/testing/selftests/vm/gup_benchmark.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c
index b2082df8beb4..f2c99e2436f8 100644
--- a/tools/testing/selftests/vm/gup_benchmark.c
+++ b/tools/testing/selftests/vm/gup_benchmark.c
@@ -33,9 +33,12 @@ int main(int argc, char **argv)
unsigned long size = 128 * MB;
int i, fd, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
int cmd = GUP_FAST_BENCHMARK;
+ int file_map = -1;
+ int flags = MAP_ANONYMOUS | MAP_PRIVATE;
+ char *file = NULL;
char *p;
- while ((opt = getopt(argc, argv, "m:r:n:tTLU")) != -1) {
+ while ((opt = getopt(argc, argv, "m:r:n:f:tTLU")) != -1) {
switch (opt) {
case 'm':
size = atoi(optarg) * MB;
@@ -61,11 +64,22 @@ int main(int argc, char **argv)
case 'w':
write = 1;
break;
+ case 'f':
+ file = optarg;
+ flags &= ~(MAP_PRIVATE | MAP_ANONYMOUS);
+ flags |= MAP_SHARED;
+ break;
default:
return -1;
}
}
+ if (file) {
+ file_map = open(file, O_RDWR|O_CREAT);
+ if (file_map < 0)
+ perror("open"), exit(file_map);
+ }
+
gup.nr_pages_per_call = nr_pages;
gup.flags = write;
@@ -73,8 +87,7 @@ int main(int argc, char **argv)
if (fd == -1)
perror("open"), exit(1);
- p = mmap(NULL, size, PROT_READ | PROT_WRITE,
- MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+ p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, file_map, 0);
if (p == MAP_FAILED)
perror("mmap"), exit(1);
gup.addr = (unsigned long)p;
--
2.14.4
