[Intel-gfx] [I-G-T CI 4/4] lib: Free all internal buffers before measuring available memory

[Chris Wilson]

Release the internal caches (by flushing the idle_worker) to maximise the
available memory for use by tests (and to reduce sporadic skipping when
on the cusp).

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 lib/intel_os.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/intel_os.c b/lib/intel_os.c
index 6e0a46b3..a77566c1 100644
--- a/lib/intel_os.c
+++ b/lib/intel_os.c
@@ -297,7 +297,7 @@ void intel_purge_vm_caches(int drm_fd)
 {
 	int fd;
 
-	igt_drop_caches_set(drm_fd, DROP_SHRINK_ALL);
+	igt_drop_caches_set(drm_fd, DROP_SHRINK_ALL | DROP_IDLE | DROP_FREED);
 
 	fd = open("/proc/sys/vm/drop_caches", O_WRONLY);
 	if (fd >= 0) {
-- 
2.15.0.rc1