Am 02.07.2016 um 10:39 schrieb Thomas Hellstrom:
Christian,
Thanks for doing this!
A question below:
On 06/15/2016 01:44 PM, Christian König wrote:
From: Christian König <christian.koenig@xxxxxxx>
Free up the memory immediately, remember the last eviction for each domain and
make new allocations depend on the last eviction to be completed.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 49 ++++++++++++++++++---
drivers/gpu/drm/ttm/ttm_bo_util.c | 92 +++++++++++++++++++++++++++++++++++++++
include/drm/ttm/ttm_bo_driver.h | 24 ++++++++++
3 files changed, 160 insertions(+), 5 deletions(-)
/*
* Protected by @io_reserve_mutex:
@@ -298,6 +301,11 @@ struct ttm_mem_type_manager {
*/
struct list_head lru;
+
+ /*
+ * Protected by @move_lock.
+ */
+ struct fence *move;
};
Did you look at protecting the move fence with RCU? I figure where there
actually is a fence it doesn't matter much but in the fastpath where
move is NULL we'd be able to get rid of a number of locking cycles.
Yeah, thought about that as well.
I guess though there might be both licensing implications and
requirements to using kfree_rcu() to free the fence.
The problem wasn't licensing (but it is good that you point that out I
wasn't aware of this problem), but that that the existing fence RCU
function wouldn't worked here and I didn't had time to take a closer look.
Should be relative easy to switch the read path over, because we already
free the fences RCU protected.
Regards,
Christian.
/Thomas
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