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Commit 0dd8666a authored by Keith Busch's avatar Keith Busch Committed by Linus Torvalds
Browse files

tools/testing/selftests/vm/gup_benchmark.c: add MAP_SHARED option 

Add a new benchmark option, -S, to request MAP_SHARED.  This can be used
to compare with MAP_PRIVATE, or for files that require this option, like
dax.

Link: http://lkml.kernel.org/r/20181010195605.10689-5-keith.busch@intel.com


Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent aeb85ed4

tools/testing/selftests/vm/gup_benchmark.c

+7 −3
Original line number Diff line number Diff line
@@ -32,11 +32,11 @@ int main(int argc, char **argv) 
	struct gup_benchmark gup;

	unsigned long size = 128 * MB;

	int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;

	int cmd = GUP_FAST_BENCHMARK;

	int cmd = GUP_FAST_BENCHMARK, flags = MAP_PRIVATE;

	char *file = "/dev/zero";

	char *p;



	while ((opt = getopt(argc, argv, "m:r:n:f:tTLU")) != -1) {

	while ((opt = getopt(argc, argv, "m:r:n:f:tTLUS")) != -1) {

		switch (opt) {

		case 'm':

			size = atoi(optarg) * MB;
@@ -65,6 +65,10 @@ int main(int argc, char **argv) 
		case 'f':

			file = optarg;

			break;

		case 'S':

			flags &= ~MAP_PRIVATE;

			flags |= MAP_SHARED;

			break;

		default:

			return -1;

		}
@@ -83,7 +87,7 @@ int main(int argc, char **argv) 
	if (fd == -1)

		perror("open"), exit(1);



	p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, filed, 0);

	p = mmap(NULL, size, PROT_READ | PROT_WRITE, flags, filed, 0);

	if (p == MAP_FAILED)

		perror("mmap"), exit(1);

	gup.addr = (unsigned long)p;