[PATCH v4 8/8] selftests/mm: Add gup test matrix in run_vmtests.sh

[Peter Xu]

Add a matrix for testing gup based on the current gup_test.  Only run the
matrix when -a is specified because it's a bit slow.

It covers:

  - Different types of huge pages: thp, hugetlb, or no huge page
  - Permissions: Write / Read-only
  - Fast-gup, with/without
  - Types of the GUP: pin / gup / longterm pins
  - Shared / Private memories
  - GUP size: 1 / 512 / random page sizes

Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
 tools/testing/selftests/mm/run_vmtests.sh | 37 ++++++++++++++++++++---
 1 file changed, 32 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh
index 824e651f62f4..9666c0c171ab 100644
--- a/tools/testing/selftests/mm/run_vmtests.sh
+++ b/tools/testing/selftests/mm/run_vmtests.sh
@@ -90,6 +90,30 @@ test_selected() {
 	fi
 }
 
+run_gup_matrix() {
+    # -t: thp=on, -T: thp=off, -H: hugetlb=on
+    local hugetlb_mb=$(( needmem_KB / 1024 ))
+
+    for huge in -t -T "-H -m $hugetlb_mb"; do
+        # -u: gup-fast, -U: gup-basic, -a: pin-fast, -b: pin-basic, -L: pin-longterm
+        for test_cmd in -u -U -a -b -L; do
+            # -w: write=1, -W: write=0
+            for write in -w -W; do
+                # -S: shared
+                for share in -S " "; do
+                    # -n: How many pages to fetch together?  512 is special
+                    # because it's default thp size (or 2M on x86), 123 to
+                    # just test partial gup when hit a huge in whatever form
+                    for num in "-n 1" "-n 512" "-n 123"; do
+                        CATEGORY="gup_test" run_test ./gup_test \
+                                $huge $test_cmd $write $share $num
+                    done
+                done
+            done
+        done
+    done
+}
+
 # get huge pagesize and freepages from /proc/meminfo
 while read -r name size unit; do
 	if [ "$name" = "HugePages_Free:" ]; then
@@ -194,13 +218,16 @@ fi
 
 CATEGORY="mmap" run_test ./map_fixed_noreplace
 
-# get_user_pages_fast() benchmark
-CATEGORY="gup_test" run_test ./gup_test -u
-# pin_user_pages_fast() benchmark
-CATEGORY="gup_test" run_test ./gup_test -a
+if $RUN_ALL; then
+    run_gup_matrix
+else
+    # get_user_pages_fast() benchmark
+    CATEGORY="gup_test" run_test ./gup_test -u
+    # pin_user_pages_fast() benchmark
+    CATEGORY="gup_test" run_test ./gup_test -a
+fi
 # Dump pages 0, 19, and 4096, using pin_user_pages:
 CATEGORY="gup_test" run_test ./gup_test -ct -F 0x1 0 19 0x1000
-
 CATEGORY="gup_test" run_test ./gup_longterm
 
 CATEGORY="userfaultfd" run_test ./uffd-unit-tests
-- 
2.41.0