[PATCHv4 3/3] mm/gup_benchemark: add LONGTERM_BENCHMARK test in gup fast path

[Pingfan Liu <kernelfans@xxxxxxxxx>]

Introduce a GUP_LONGTERM_BENCHMARK ioctl to test longterm pin in gup fast
path.

Signed-off-by: Pingfan Liu <kernelfans@xxxxxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 mm/gup_benchmark.c                         | 11 +++++++++--
 tools/testing/selftests/vm/gup_benchmark.c | 10 +++++++---
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
index 7dd602d..83f3378 100644
--- a/mm/gup_benchmark.c
+++ b/mm/gup_benchmark.c
@@ -6,8 +6,9 @@
 #include <linux/debugfs.h>
 
 #define GUP_FAST_BENCHMARK	_IOWR('g', 1, struct gup_benchmark)
-#define GUP_LONGTERM_BENCHMARK	_IOWR('g', 2, struct gup_benchmark)
-#define GUP_BENCHMARK		_IOWR('g', 3, struct gup_benchmark)
+#define GUP_FAST_LONGTERM_BENCHMARK	_IOWR('g', 2, struct gup_benchmark)
+#define GUP_LONGTERM_BENCHMARK	_IOWR('g', 3, struct gup_benchmark)
+#define GUP_BENCHMARK		_IOWR('g', 4, struct gup_benchmark)
 
 struct gup_benchmark {
 	__u64 get_delta_usec;
@@ -53,6 +54,11 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
 			nr = get_user_pages_fast(addr, nr, gup->flags & 1,
 						 pages + i);
 			break;
+		case GUP_FAST_LONGTERM_BENCHMARK:
+			nr = get_user_pages_fast(addr, nr,
+					(gup->flags & 1) | FOLL_LONGTERM,
+					 pages + i);
+			break;
 		case GUP_LONGTERM_BENCHMARK:
 			nr = get_user_pages(addr, nr,
 					    (gup->flags & 1) | FOLL_LONGTERM,
@@ -96,6 +102,7 @@ static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd,
 
 	switch (cmd) {
 	case GUP_FAST_BENCHMARK:
+	case GUP_FAST_LONGTERM_BENCHMARK:
 	case GUP_LONGTERM_BENCHMARK:
 	case GUP_BENCHMARK:
 		break;
diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c
index c0534e2..ade8acb 100644
--- a/tools/testing/selftests/vm/gup_benchmark.c
+++ b/tools/testing/selftests/vm/gup_benchmark.c
@@ -15,8 +15,9 @@
 #define PAGE_SIZE sysconf(_SC_PAGESIZE)
 
 #define GUP_FAST_BENCHMARK	_IOWR('g', 1, struct gup_benchmark)
-#define GUP_LONGTERM_BENCHMARK	_IOWR('g', 2, struct gup_benchmark)
-#define GUP_BENCHMARK		_IOWR('g', 3, struct gup_benchmark)
+#define GUP_FAST_LONGTERM_BENCHMARK	_IOWR('g', 2, struct gup_benchmark)
+#define GUP_LONGTERM_BENCHMARK	_IOWR('g', 3, struct gup_benchmark)
+#define GUP_BENCHMARK		_IOWR('g', 4, struct gup_benchmark)
 
 struct gup_benchmark {
 	__u64 get_delta_usec;
@@ -37,7 +38,7 @@ int main(int argc, char **argv)
 	char *file = "/dev/zero";
 	char *p;
 
-	while ((opt = getopt(argc, argv, "m:r:n:f:tTLUSH")) != -1) {
+	while ((opt = getopt(argc, argv, "m:r:n:f:tTlLUSH")) != -1) {
 		switch (opt) {
 		case 'm':
 			size = atoi(optarg) * MB;
@@ -54,6 +55,9 @@ int main(int argc, char **argv)
 		case 'T':
 			thp = 0;
 			break;
+		case 'l':
+			cmd = GUP_FAST_LONGTERM_BENCHMARK;
+			break;
 		case 'L':
 			cmd = GUP_LONGTERM_BENCHMARK;
 			break;
-- 
2.7.5