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 <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Dan Williams <[email protected]> Signed-off-by: Keith Busch <[email protected]> --- 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
