[PATCH v2 2/3] tests/gem_close_race: Adapt the test for Full PPGTT

[oscar.mateo@intel.com]

From: Oscar Mateo <oscar.mateo@intel.com>

With Full PPGTT, each new fd creates a new context and thus a new
PPGTT, so we have to reduce the number of simultaneous fds or face
OOM problems. For every new PPGTT, its PDEs are stored in the GGTT
which imposes a limit of 1024 new contexts. We want to leave at
least 1/4 of the GGTT available for "important" stuff like scanout
buffers, so never open more than 768 fds.

v2: Unconditionally use the lower limit, as suggested by Daniel
Vetter

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
 tests/gem_close_race.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/gem_close_race.c b/tests/gem_close_race.c
index 6064c02..3a2d847 100644
--- a/tests/gem_close_race.c
+++ b/tests/gem_close_race.c
@@ -136,7 +136,7 @@ static void run(int child)
 		gem_read(fd, handle, 0, &handle, sizeof(handle));
 }
 
-#define NUM_FD 32000
+#define NUM_FD 768
 
 struct thread {
 	pthread_mutex_t mutex;
@@ -222,7 +222,7 @@ igt_main
 	}
 
 	igt_subtest("process-exit") {
-		igt_fork(child, 2000)
+		igt_fork(child, NUM_FD)
 			run(child);
 		igt_waitchildren();
 	}
-- 
1.7.9.5