Having resolved whether or not we would deadlock upon a call to
mutex_lock(&dev->struct_mutex), we can then wait for the contended
struct_mutex if we are not the owner. This should significantly improve
the chance of running the shrinker for other processes whilst the GPU is
busy.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_shrinker.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index b409e67c5c72..03e08e1853e6 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -39,8 +39,8 @@ static bool shrinker_lock(struct drm_i915_private *dev_priv, bool *unlock)
{
switch (mutex_trylock_recursive(&dev_priv->drm.struct_mutex)) {
case MUTEX_TRYLOCK_FAILED:
- return false;
-
+ if (mutex_lock_killable(&dev_priv->drm.struct_mutex))
+ return false;
case MUTEX_TRYLOCK_SUCCESS:
*unlock = true;
return true;
--
2.11.0
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