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Commit 395a31ec authored by Francisco Jerez's avatar Francisco Jerez
Browse files

drm/nouveau: Spin for a bit in nouveau_fence_wait() before yielding the CPU. 



Sleeping doesn't pay off for very short delays in comparison with the
minimum granularity of schedule_timeout().

Signed-off-by: default avatarFrancisco Jerez <currojerez@riseup.net>
Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent a3d487ea

drivers/gpu/drm/nouveau/nouveau_fence.c

+2 −1
Original line number Diff line number Diff line
@@ -218,6 +218,7 @@ int 
__nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)

{

	unsigned long timeout = jiffies + (3 * DRM_HZ);

	unsigned long sleep_time = jiffies + 1;

	int ret = 0;



	while (1) {
@@ -231,7 +232,7 @@ __nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr) 


		__set_current_state(intr ? TASK_INTERRUPTIBLE

			: TASK_UNINTERRUPTIBLE);

		if (lazy)

		if (lazy && time_after_eq(jiffies, sleep_time))

			schedule_timeout(1);



		if (intr && signal_pending(current)) {