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Subject[PATCH 4/6] tools/gup_benchmark: Allow user specified file
Date
This patch allows a user to specify a file to map by adding a new option,
'-f', providing a means to test various file backings.

If not specified, the benchmark will use a private mapping of /dev/zero,
which produces an anonymous mapping as before.

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: Keith Busch <keith.busch@intel.com>
---
tools/testing/selftests/vm/gup_benchmark.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c
index b2082df8beb4..b675a3d60975 100644
--- a/tools/testing/selftests/vm/gup_benchmark.c
+++ b/tools/testing/selftests/vm/gup_benchmark.c
@@ -31,11 +31,12 @@ int main(int argc, char **argv)
{
struct gup_benchmark gup;
unsigned long size = 128 * MB;
- int i, fd, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
+ int i, fd, filed, opt, nr_pages = 1, thp = -1, repeats = 1, write = 0;
int cmd = GUP_FAST_BENCHMARK;
+ char *file = "/dev/zero";
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 +62,18 @@ int main(int argc, char **argv)
case 'w':
write = 1;
break;
+ case 'f':
+ file = optarg;
+ break;
default:
return -1;
}
}

+ filed = open(file, O_RDWR|O_CREAT);
+ if (filed < 0)
+ perror("open"), exit(filed);
+
gup.nr_pages_per_call = nr_pages;
gup.flags = write;

@@ -73,8 +81,7 @@ 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, MAP_PRIVATE, filed, 0);
if (p == MAP_FAILED)
perror("mmap"), exit(1);
gup.addr = (unsigned long)p;
--
2.14.4
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