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

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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>
This commit is contained in:
Keith Busch 2018-10-26 15:10:08 -07:00 committed by Linus Torvalds
parent aeb85ed4f4
commit 0dd8666afb
1 changed files with 7 additions and 3 deletions
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10
tools/testing/selftests/vm/gup_benchmark.c
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@ -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;