linux-kernel - [PATCH 5/5] i915: fence workqueue optimization

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Date:   Fri,  7 Apr 2017 01:23:47 +0200
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Martin Kepplinger <martink@...teo.de>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        daniel.vetter@...el.com, Dave Airlie <airlied@...il.com>,
        Chris Wilson <chris@...is-wilson.co.uk>
Cc:     intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 5/5] i915: fence workqueue optimization

Insist to run llist_del_all() until the free_list is found empty, this
may avoid having to schedule more workqueues.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---
 drivers/gpu/drm/i915/intel_display.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 24f303e..931f0c7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14374,9 +14374,9 @@ static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
 	struct intel_atomic_state *state, *next;
 	struct llist_node *freed;
 
-	freed = llist_del_all(&dev_priv->atomic_helper.free_list);
-	llist_for_each_entry_safe(state, next, freed, freed)
-		drm_atomic_state_put(&state->base);
+	while ((freed = llist_del_all(&dev_priv->atomic_helper.free_list)))
+		llist_for_each_entry_safe(state, next, freed, freed)
+			drm_atomic_state_put(&state->base);
 }
 
 static void intel_atomic_helper_free_state_worker(struct work_struct *work)