igt: Exercise the shrinker

Introduce a new fork helper that spawns a process that just repeatedly
calls i915_gem_shrink_all() and watch what happens as we try to use
objects that have been shrunk.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 11 insertions, 1 deletions

diff --git a/tests/gem_render_tiled_blits.c b/tests/gem_render_tiled_blits.c
index 9f0e5884..aebbcb96 100644
--- a/tests/gem_render_tiled_blits.c
+++ b/tests/gem_render_tiled_blits.c
@@ -210,12 +210,22 @@ igt_main
 	/* the rest of the tests are too long for simulation */
 	igt_skip_on_simulation();
 
-	igt_subtest("apperture-thrash") {
+	igt_subtest("aperture-thrash") {
 		count = 3 * gem_aperture_size(fd) / SIZE / 2;
 		intel_require_memory(count, SIZE, CHECK_RAM);
 		run_test(fd, count);
 	}
 
+	igt_subtest("aperture-shrink") {
+		igt_fork_shrink_helper();
+
+		count = 3 * gem_aperture_size(fd) / SIZE / 2;
+		intel_require_memory(count, SIZE, CHECK_RAM);
+		run_test(fd, count);
+
+		igt_stop_shrink_helper();
+	}
+
 	igt_subtest("swap-thrash") {
 		uint64_t swap_mb = intel_get_total_swap_mb();
 		igt_require(swap_mb > 0);