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

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

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Francisco Jerez
2010-11-25 16:37:17 +01:00
parent a3d487ea54
commit 395a31ec7e
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/nouveau_fence.c
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@@ -218,6 +218,7 @@ int
__nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr) __nouveau_fence_wait(void *sync_obj, void *sync_arg, bool lazy, bool intr)
{ {
unsigned long timeout = jiffies + (3 * DRM_HZ); unsigned long timeout = jiffies + (3 * DRM_HZ);
unsigned long sleep_time = jiffies + 1;
int ret = 0; int ret = 0;
while (1) { 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 __set_current_state(intr ? TASK_INTERRUPTIBLE
: TASK_UNINTERRUPTIBLE); : TASK_UNINTERRUPTIBLE);
if (lazy) if (lazy && time_after_eq(jiffies, sleep_time))
schedule_timeout(1); schedule_timeout(1);
if (intr && signal_pending(current)) { if (intr && signal_pending(current)) {