From: Keith Busch <keith.busch@xxxxxxxxx> Subject: 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@xxxxxxxxx Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Kirill Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> Cc: Dan Williams <dan.j.williams@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/vm/gup_benchmark.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) --- a/tools/testing/selftests/vm/gup_benchmark.c~tools-gup_benchmark-add-map_shared-option +++ a/tools/testing/selftests/vm/gup_benchmark.c @@ -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; _
