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authorKeith Busch <keith.busch@intel.com>2018-10-26 15:10:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-10-26 16:38:15 -0700
commit0dd8666afb99c71d124e0c2abf1ad7d934a242a0 (patch)
tree46a7bc2b351b03dc97be4b05257e56a453afa7a8
parentaeb85ed4f41a8c0f5c4606d69f5da75e2348d984 (diff)
downloadlinux-0dd8666afb99c71d124e0c2abf1ad7d934a242a0.tar.bz2
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: Keith Busch <keith.busch@intel.com> Reviewed-by: Andrew 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--tools/testing/selftests/vm/gup_benchmark.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c
index 43a2d60e0e93..5c8e4cb1441a 100644
--- a/tools/testing/selftests/vm/gup_benchmark.c
+++ b/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;