On 30/11/2018 21:58, Chris Wilson wrote:
Quoting Tvrtko Ursulin (2018-11-30 17:44:12)
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
The new workaround list allocator grows the list in chunks so will end up
with some unused space. Trim it when the initialization phase is done to
free up a tiny bit of slab.
v2:
* Simplify with kmemdup. (Chris Wilson)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_workarounds.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 3e6b388ea022..9d876d554e57 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -55,6 +55,19 @@ static void wa_init_start(struct i915_wa_list *wal, const char *name)
static void wa_init_finish(struct i915_wa_list *wal)
{
+ /* Trim unused entries. */
+ if (wal->count < wal->__size) {
+ struct i915_wa *list = kmemdup(wal->list,
+ wal->count * sizeof(*list),
+ GFP_KERNEL);
+
+ if (list) {
+ kfree(wal->list);
+ wal->list = list;
+ wal->__size = wal->count;
Hmm. We could kill __size entirely if you reallocated on
is_power_of_two(wal->count).
You mean allocate to next power of two is is_power_of_two(wal->count) ?
In that case I could also allocate to next ALIGN(wal->count, CHUNK_SIZE)
if IS_ALIGNED which looks more appropriate for this particular use case.
Can't decide whether it is worth it though. Why not..
Regards,
Tvrtko
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
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