[Intel-gfx] [PATCH 2/2] drm/i915: Remove the global cache shrink & rcu barrier on allocation failure

[Chris Wilson]

Earlier, we reasoned that having idled the gpu under mempressure, that
would be a good time to trim our request slabs in order to perform the
next request allocation. We have stopped performing the global operation
on the device (no idling) and wish to make the allocation failure
handling more local, so out with the global barrier that may take a long
time.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/i915_request.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 32bf2c9868bf..c5e40e5f0e65 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -657,17 +657,6 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
 		if (rq)
 			cond_synchronize_rcu(rq->rcustate);
 
-		/*
-		 * We've forced the client to stall and catch up with whatever
-		 * backlog there might have been. As we are assuming that we
-		 * caused the mempressure, now is an opportune time to
-		 * recover as much memory from the request pool as is possible.
-		 * Having already penalized the client to stall, we spend
-		 * a little extra time to re-optimise page allocation.
-		 */
-		kmem_cache_shrink(i915->requests);
-		rcu_barrier(); /* Recover the TYPESAFE_BY_RCU pages */
-
 		rq = kmem_cache_alloc(i915->requests, GFP_KERNEL);
 		if (!rq) {
 			ret = -ENOMEM;
-- 
2.19.0