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tools/testing/selftests/vm/gup_benchmark.c: allow user specified file

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Allow 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.

[akpm@linux-foundation.org: avoid using comma operator]
Link: http://lkml.kernel.org/r/20181010195605.10689-4-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 15:10:02 -07:00 committed by Linus Torvalds
parent 319e0bec1a
commit aeb85ed4f4
1 changed files with 13 additions and 4 deletions
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17
tools/testing/selftests/vm/gup_benchmark.c
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@ -31,11 +31,12 @@ int main(int argc, char **argv)
{ {
struct gup_benchmark gup; struct gup_benchmark gup;
unsigned long size = 128 * MB; 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; int cmd = GUP_FAST_BENCHMARK;
char *file = "/dev/zero";
char *p; 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) { switch (opt) {
case 'm': case 'm':
size = atoi(optarg) * MB; size = atoi(optarg) * MB;
@ -61,11 +62,20 @@ int main(int argc, char **argv)
case 'w': case 'w':
write = 1; write = 1;
break; break;
case 'f':
file = optarg;
break;
default: default:
return -1; return -1;
} }
} }
filed = open(file, O_RDWR|O_CREAT);
if (filed < 0) {
perror("open");
exit(filed);
}
gup.nr_pages_per_call = nr_pages; gup.nr_pages_per_call = nr_pages;
gup.flags = write; gup.flags = write;
@ -73,8 +83,7 @@ int main(int argc, char **argv)
if (fd == -1) if (fd == -1)
perror("open"), exit(1); perror("open"), exit(1);
p = mmap(NULL, size, PROT_READ | PROT_WRITE, p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, filed, 0);
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (p == MAP_FAILED) if (p == MAP_FAILED)
perror("mmap"), exit(1); perror("mmap"), exit(1);
gup.addr = (unsigned long)p; gup.addr = (unsigned long)p;