[PATCH v2 0/5] drm/ttm,amdgpu: Introduce LRU bulk move functionality

[PATCH v2 0/5] drm/ttm,amdgpu: Introduce LRU bulk move functionality

[Huang Rui]

The idea and proposal is originally from Christian, and I continue to work to
deliver it.

Background:
amdgpu driver will move all PD/PT and PerVM BOs into idle list. Then move all of
them on the end of LRU list one by one. Thus, that cause so many BOs moved to
the end of the LRU, and impact performance seriously.

Then Christian provided a workaround to not move PD/PT BOs on LRU with below
patch:
"drm/amdgpu: band aid validating VM PTs"
Commit 0bbf32026cf5ba41e9922b30e26e1bed1ecd38ae

However, the final solution should bulk move all PD/PT and PerVM BOs on the LRU
instead of one by one.

Whenever amdgpu_vm_validate_pt_bos() is called and we have BOs which need to be
validated we move all BOs together to the end of the LRU without dropping the
lock for the LRU.

While doing so we note the beginning and end of this block in the LRU list.

Now when amdgpu_vm_validate_pt_bos() is called and we don't have anything to do,
we don't move every BO one by one, but instead cut the LRU list into pieces so
that we bulk move everything to the end in just one operation.

Test data:
+--------------+-----------------+-----------+---------------------------------------+
|              |The Talos        |Clpeak(OCL)|BusSpeedReadback(OCL)                  |
|              |Principle(Vulkan)|           |                                       |
+------------------------------------------------------------------------------------+
|              |                 |           |0.319 ms(1k) 0.314 ms(2K) 0.308 ms(4K) |
| Original     |  147.7 FPS      |  76.86 us |0.307 ms(8K) 0.310 ms(16K)             |
+------------------------------------------------------------------------------------+
| Orignial + WA|                 |           |0.254 ms(1K) 0.241 ms(2K)              |
|(don't move   |  162.1 FPS      |  42.15 us |0.230 ms(4K) 0.223 ms(8K) 0.204 ms(16K)|
|PT BOs on LRU)|                 |           |                                       |
+------------------------------------------------------------------------------------+
| Bulk move    |  163.1 FPS      |  40.52 us |0.244 ms(1K) 0.252 ms(2K) 0.213 ms(4K) |
|              |                 |           |0.214 ms(8K) 0.225 ms(16K)             |
+--------------+-----------------+-----------+---------------------------------------+

After test them with above three benchmarks include vulkan and opencl. We can
see the visible improvement than original, and even better than original with
workaround.

Changes from V1 -> V2:
- Fix to missed the BOs in relocated/moved that should be also moved to the end
  of LRU.

Thanks,
Rui

Christian König (2):
  drm/ttm: add helper structures for bulk moves on lru list
  drm/ttm: revise ttm_bo_move_to_lru_tail to support bulk moves

Huang Rui (3):
  drm/ttm: add bulk move function on LRU
  drm/amdgpu: use bulk moves for efficient VM LRU handling (v2)
  drm/amdgpu: move PD/PT bos on LRU again

 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 77 +++++++++++++++++++++++++--------
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  4 ++
 drivers/gpu/drm/ttm/ttm_bo.c           | 78 +++++++++++++++++++++++++++++++++-
 include/drm/ttm/ttm_bo_api.h           | 16 ++++++-
 include/drm/ttm/ttm_bo_driver.h        | 28 ++++++++++++
 5 files changed, 184 insertions(+), 19 deletions(-)

-- 
2.7.4

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[PATCH v2 1/5] drm/ttm: add helper structures for bulk moves on lru list

[Huang Rui]

From: Christian König <christian.koenig@amd.com>

Add bulk move pos to store the pointer of first and last buffer object.
The list in between will be bulk moved on lru list.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
---
 include/drm/ttm/ttm_bo_driver.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 3234cc3..e4fee8e 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -491,6 +491,34 @@ struct ttm_bo_device {
 };
 
 /**
+ * struct ttm_lru_bulk_move_pos
+ *
+ * @first: first BO in the bulk move range
+ * @last: last BO in the bulk move range
+ *
+ * Positions for a lru bulk move.
+ */
+struct ttm_lru_bulk_move_pos {
+	struct ttm_buffer_object *first;
+	struct ttm_buffer_object *last;
+};
+
+/**
+ * struct ttm_lru_bulk_move
+ *
+ * @tt: first/last lru entry for BOs in the TT domain
+ * @vram: first/last lru entry for BOs in the VRAM domain
+ * @swap: first/last lru entry for BOs on the swap list
+ *
+ * Helper structure for bulk moves on the LRU list.
+ */
+struct ttm_lru_bulk_move {
+	struct ttm_lru_bulk_move_pos tt[TTM_MAX_BO_PRIORITY];
+	struct ttm_lru_bulk_move_pos vram[TTM_MAX_BO_PRIORITY];
+	struct ttm_lru_bulk_move_pos swap[TTM_MAX_BO_PRIORITY];
+};
+
+/**
  * ttm_flag_masked
  *
  * @old: Pointer to the result and original value.
-- 
2.7.4

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[PATCH v2 2/5] drm/ttm: revise ttm_bo_move_to_lru_tail to support bulk moves

[Huang Rui]

From: Christian König <christian.koenig@amd.com>

When move a BO to the end of LRU, it need remember the BO positions.
Make sure all moved bo in between "first" and "last". And they will be bulk
moving together.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c |  8 ++++----
 drivers/gpu/drm/ttm/ttm_bo.c           | 26 +++++++++++++++++++++++++-
 include/drm/ttm/ttm_bo_api.h           |  6 +++++-
 3 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 015613b..9c84770 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -297,9 +297,9 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 				break;
 
 			spin_lock(&glob->lru_lock);
-			ttm_bo_move_to_lru_tail(&bo->tbo);
+			ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
 			if (bo->shadow)
-				ttm_bo_move_to_lru_tail(&bo->shadow->tbo);
+				ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
 			spin_unlock(&glob->lru_lock);
 		}
 
@@ -319,9 +319,9 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		if (!bo->parent)
 			continue;
 
-		ttm_bo_move_to_lru_tail(&bo->tbo);
+		ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
 		if (bo->shadow)
-			ttm_bo_move_to_lru_tail(&bo->shadow->tbo);
+			ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
 	}
 	spin_unlock(&glob->lru_lock);
 
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 7c48472..7117b6b 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -214,12 +214,36 @@ void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
 }
 EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
 
-void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo)
+static void ttm_bo_bulk_move_set_pos(struct ttm_lru_bulk_move_pos *pos,
+				     struct ttm_buffer_object *bo)
+{
+	if (!pos->first)
+		pos->first = bo;
+	pos->last = bo;
+}
+
+void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
+			     struct ttm_lru_bulk_move *bulk)
 {
 	reservation_object_assert_held(bo->resv);
 
 	ttm_bo_del_from_lru(bo);
 	ttm_bo_add_to_lru(bo);
+
+	if (bulk && !(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
+		switch (bo->mem.mem_type) {
+		case TTM_PL_TT:
+			ttm_bo_bulk_move_set_pos(&bulk->tt[bo->priority], bo);
+			break;
+
+		case TTM_PL_VRAM:
+			ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
+			break;
+		}
+		if (bo->ttm && !(bo->ttm->page_flags &
+				 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
+			ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
+	}
 }
 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index a01ba20..0d4eb81 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -51,6 +51,8 @@ struct ttm_placement;
 
 struct ttm_place;
 
+struct ttm_lru_bulk_move;
+
 /**
  * struct ttm_bus_placement
  *
@@ -405,12 +407,14 @@ void ttm_bo_del_from_lru(struct ttm_buffer_object *bo);
  * ttm_bo_move_to_lru_tail
  *
  * @bo: The buffer object.
+ * @bulk: optional bulk move structure to remember BO positions
  *
  * Move this BO to the tail of all lru lists used to lookup and reserve an
  * object. This function must be called with struct ttm_bo_global::lru_lock
  * held, and is used to make a BO less likely to be considered for eviction.
  */
-void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
+void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
+			     struct ttm_lru_bulk_move *bulk);
 
 /**
  * ttm_bo_lock_delayed_workqueue
-- 
2.7.4

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[PATCH v2 3/5] drm/ttm: add bulk move function on LRU

[Huang Rui]

This function allow us to bulk move a group of BOs to the tail of their LRU.
The positions of group of BOs are stored on the (first, last) bulk_move_pos
structure.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 52 ++++++++++++++++++++++++++++++++++++++++++++
 include/drm/ttm/ttm_bo_api.h | 10 +++++++++
 2 files changed, 62 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 7117b6b..39d9d55 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -247,6 +247,58 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 }
 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
 
+static void ttm_bo_bulk_move_helper(struct ttm_lru_bulk_move_pos *pos,
+				    struct list_head *lru, bool is_swap)
+{
+	struct list_head entries, before;
+	struct list_head *list1, *list2;
+
+	list1 = is_swap ? &pos->last->swap : &pos->last->lru;
+	list2 = is_swap ? pos->first->swap.prev : pos->first->lru.prev;
+
+	list_cut_position(&entries, lru, list1);
+	list_cut_position(&before, &entries, list2);
+	list_splice(&before, lru);
+	list_splice_tail(&entries, lru);
+}
+
+void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
+{
+	unsigned i;
+
+	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
+		struct ttm_mem_type_manager *man;
+
+		if (!bulk->tt[i].first)
+			continue;
+
+		man = &bulk->tt[i].first->bdev->man[TTM_PL_TT];
+		ttm_bo_bulk_move_helper(&bulk->tt[i], &man->lru[i], false);
+	}
+
+	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
+		struct ttm_mem_type_manager *man;
+
+		if (!bulk->vram[i].first)
+			continue;
+
+		man = &bulk->vram[i].first->bdev->man[TTM_PL_VRAM];
+		ttm_bo_bulk_move_helper(&bulk->vram[i], &man->lru[i], false);
+	}
+
+	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
+		struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
+		struct list_head *lru;
+
+		if (!pos->first)
+			continue;
+
+		lru = &pos->first->bdev->glob->swap_lru[i];
+		ttm_bo_bulk_move_helper(&bulk->swap[i], lru, true);
+	}
+}
+EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
+
 static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 				  struct ttm_mem_reg *mem, bool evict,
 				  struct ttm_operation_ctx *ctx)
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 0d4eb81..8c19470 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -417,6 +417,16 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 			     struct ttm_lru_bulk_move *bulk);
 
 /**
+ * ttm_bo_bulk_move_lru_tail
+ *
+ * @bulk: bulk move structure
+ *
+ * Bulk move BOs to the LRU tail, only valid to use when driver makes sure that
+ * BO order never changes. Should be called with ttm_bo_global::lru_lock held.
+ */
+void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk);
+
+/**
  * ttm_bo_lock_delayed_workqueue
  *
  * Prevent the delayed workqueue from running.
-- 
2.7.4

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[PATCH v2 4/5] drm/amdgpu: use bulk moves for efficient VM LRU handling (v2)

[Huang Rui]

I continue to work for bulk moving that based on the proposal by Christian.

Background:
amdgpu driver will move all PD/PT and PerVM BOs into idle list. Then move all of
them on the end of LRU list one by one. Thus, that cause so many BOs moved to
the end of the LRU, and impact performance seriously.

Then Christian provided a workaround to not move PD/PT BOs on LRU with below
patch:
"drm/amdgpu: band aid validating VM PTs"
Commit 0bbf32026cf5ba41e9922b30e26e1bed1ecd38ae

However, the final solution should bulk move all PD/PT and PerVM BOs on the LRU
instead of one by one.

Whenever amdgpu_vm_validate_pt_bos() is called and we have BOs which need to be
validated we move all BOs together to the end of the LRU without dropping the
lock for the LRU.

While doing so we note the beginning and end of this block in the LRU list.

Now when amdgpu_vm_validate_pt_bos() is called and we don't have anything to do,
we don't move every BO one by one, but instead cut the LRU list into pieces so
that we bulk move everything to the end in just one operation.

Test data:
+--------------+-----------------+-----------+---------------------------------------+
|              |The Talos        |Clpeak(OCL)|BusSpeedReadback(OCL)                  |
|              |Principle(Vulkan)|           |                                       |
+------------------------------------------------------------------------------------+
|              |                 |           |0.319 ms(1k) 0.314 ms(2K) 0.308 ms(4K) |
| Original     |  147.7 FPS      |  76.86 us |0.307 ms(8K) 0.310 ms(16K)             |
+------------------------------------------------------------------------------------+
| Orignial + WA|                 |           |0.254 ms(1K) 0.241 ms(2K)              |
|(don't move   |  162.1 FPS      |  42.15 us |0.230 ms(4K) 0.223 ms(8K) 0.204 ms(16K)|
|PT BOs on LRU)|                 |           |                                       |
+------------------------------------------------------------------------------------+
| Bulk move    |  163.1 FPS      |  40.52 us |0.244 ms(1K) 0.252 ms(2K) 0.213 ms(4K) |
|              |                 |           |0.214 ms(8K) 0.225 ms(16K)             |
+--------------+-----------------+-----------+---------------------------------------+

After test them with above three benchmarks include vulkan and opencl. We can
see the visible improvement than original, and even better than original with
workaround.

v2: move all BOs include idle, relocated, and moved list to the end of LRU and
put them together.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 75 ++++++++++++++++++++++++++--------
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  4 ++
 2 files changed, 63 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 9c84770..81fb1ac 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -268,6 +268,55 @@ void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
 }
 
 /**
+ * amdgpu_vm_move_to_lru_tail - move one list of BOs to end of LRU
+ *
+ * @adev: amdgpu device pointer
+ * @vm: vm providing the BOs
+ * @list: the list that stored BOs
+ *
+ * Move one list of BOs to the end of LRU and update the positions.
+ */
+static void
+amdgpu_vm_move_to_lru_tail_by_list(struct amdgpu_device *adev,
+				   struct amdgpu_vm *vm, struct list_head *list)
+{
+	struct amdgpu_vm_bo_base *bo_base, *tmp;
+
+	list_for_each_entry_safe(bo_base, tmp, list, vm_status) {
+		struct amdgpu_bo *bo = bo_base->bo;
+
+		if (!bo->parent)
+			continue;
+
+		ttm_bo_move_to_lru_tail(&bo->tbo, &vm->lru_bulk_move);
+		if (bo->shadow)
+			ttm_bo_move_to_lru_tail(&bo->shadow->tbo,
+						&vm->lru_bulk_move);
+	}
+}
+
+/**
+ * amdgpu_vm_move_to_lru_tail - move all BOs to the end of LRU
+ *
+ * @adev: amdgpu device pointer
+ * @vm: vm providing the BOs
+ *
+ * Move all BOs to the end of LRU and remember their positions to put them
+ * together.
+ */
+static void
+amdgpu_vm_move_to_lru_tail(struct amdgpu_device *adev, struct amdgpu_vm *vm)
+{
+	struct ttm_bo_global *glob = adev->mman.bdev.glob;
+
+	spin_lock(&glob->lru_lock);
+	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->idle);
+	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->relocated);
+	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->moved);
+	spin_unlock(&glob->lru_lock);
+}
+
+/**
  * amdgpu_vm_validate_pt_bos - validate the page table BOs
  *
  * @adev: amdgpu device pointer
@@ -286,6 +335,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 {
 	struct ttm_bo_global *glob = adev->mman.bdev.glob;
 	struct amdgpu_vm_bo_base *bo_base, *tmp;
+	bool validated = false;
 	int r = 0;
 
 	list_for_each_entry_safe(bo_base, tmp, &vm->evicted, vm_status) {
@@ -295,14 +345,9 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 			r = validate(param, bo);
 			if (r)
 				break;
-
-			spin_lock(&glob->lru_lock);
-			ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
-			if (bo->shadow)
-				ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
-			spin_unlock(&glob->lru_lock);
 		}
 
+		validated = true;
 		if (bo->tbo.type != ttm_bo_type_kernel) {
 			spin_lock(&vm->moved_lock);
 			list_move(&bo_base->vm_status, &vm->moved);
@@ -312,18 +357,16 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		}
 	}
 
-	spin_lock(&glob->lru_lock);
-	list_for_each_entry(bo_base, &vm->idle, vm_status) {
-		struct amdgpu_bo *bo = bo_base->bo;
+	if (!validated) {
+		spin_lock(&glob->lru_lock);
+		ttm_bo_bulk_move_lru_tail(&vm->lru_bulk_move);
+		spin_unlock(&glob->lru_lock);
+		return 0;
+	}
 
-		if (!bo->parent)
-			continue;
+	memset(&vm->lru_bulk_move, 0, sizeof(vm->lru_bulk_move));
 
-		ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
-		if (bo->shadow)
-			ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
-	}
-	spin_unlock(&glob->lru_lock);
+	amdgpu_vm_move_to_lru_tail(adev, vm);
 
 	return r;
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 67a15d4..92725ac 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -29,6 +29,7 @@
 #include <linux/rbtree.h>
 #include <drm/gpu_scheduler.h>
 #include <drm/drm_file.h>
+#include <drm/ttm/ttm_bo_driver.h>
 
 #include "amdgpu_sync.h"
 #include "amdgpu_ring.h"
@@ -226,6 +227,9 @@ struct amdgpu_vm {
 
 	/* Some basic info about the task */
 	struct amdgpu_task_info task_info;
+
+	/* Store positions of group of BOs */
+	struct ttm_lru_bulk_move lru_bulk_move;
 };
 
 struct amdgpu_vm_manager {
-- 
2.7.4

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[PATCH v2 5/5] drm/amdgpu: move PD/PT bos on LRU again

[Huang Rui]

The new bulk moving functionality is ready, the overhead of moving PD/PT bos to
LRU is fixed. So move them on LRU again.

Signed-off-by: Huang Rui <ray.huang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 81fb1ac..9f44514 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1127,7 +1127,7 @@ int amdgpu_vm_update_directories(struct amdgpu_device *adev,
 					   struct amdgpu_vm_bo_base,
 					   vm_status);
 		bo_base->moved = false;
-		list_del_init(&bo_base->vm_status);
+		list_move(&bo_base->vm_status, &vm->idle);
 
 		bo = bo_base->bo->parent;
 		if (!bo)
-- 
2.7.4

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Re: [PATCH v2 4/5] drm/amdgpu: use bulk moves for efficient VM LRU handling (v2)

[Christian König]

Am 10.08.2018 um 13:55 schrieb Huang Rui:
> I continue to work for bulk moving that based on the proposal by Christian.
>
> Background:
> amdgpu driver will move all PD/PT and PerVM BOs into idle list. Then move all of
> them on the end of LRU list one by one. Thus, that cause so many BOs moved to
> the end of the LRU, and impact performance seriously.
>
> Then Christian provided a workaround to not move PD/PT BOs on LRU with below
> patch:
> "drm/amdgpu: band aid validating VM PTs"
> Commit 0bbf32026cf5ba41e9922b30e26e1bed1ecd38ae
>
> However, the final solution should bulk move all PD/PT and PerVM BOs on the LRU
> instead of one by one.
>
> Whenever amdgpu_vm_validate_pt_bos() is called and we have BOs which need to be
> validated we move all BOs together to the end of the LRU without dropping the
> lock for the LRU.
>
> While doing so we note the beginning and end of this block in the LRU list.
>
> Now when amdgpu_vm_validate_pt_bos() is called and we don't have anything to do,
> we don't move every BO one by one, but instead cut the LRU list into pieces so
> that we bulk move everything to the end in just one operation.
>
> Test data:
> +--------------+-----------------+-----------+---------------------------------------+
> |              |The Talos        |Clpeak(OCL)|BusSpeedReadback(OCL)                  |
> |              |Principle(Vulkan)|           |                                       |
> +------------------------------------------------------------------------------------+
> |              |                 |           |0.319 ms(1k) 0.314 ms(2K) 0.308 ms(4K) |
> | Original     |  147.7 FPS      |  76.86 us |0.307 ms(8K) 0.310 ms(16K)             |
> +------------------------------------------------------------------------------------+
> | Orignial + WA|                 |           |0.254 ms(1K) 0.241 ms(2K)              |
> |(don't move   |  162.1 FPS      |  42.15 us |0.230 ms(4K) 0.223 ms(8K) 0.204 ms(16K)|
> |PT BOs on LRU)|                 |           |                                       |
> +------------------------------------------------------------------------------------+
> | Bulk move    |  163.1 FPS      |  40.52 us |0.244 ms(1K) 0.252 ms(2K) 0.213 ms(4K) |
> |              |                 |           |0.214 ms(8K) 0.225 ms(16K)             |
> +--------------+-----------------+-----------+---------------------------------------+
>
> After test them with above three benchmarks include vulkan and opencl. We can
> see the visible improvement than original, and even better than original with
> workaround.
>
> v2: move all BOs include idle, relocated, and moved list to the end of LRU and
> put them together.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
> Signed-off-by: Huang Rui <ray.huang@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 75 ++++++++++++++++++++++++++--------
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  4 ++
>   2 files changed, 63 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 9c84770..81fb1ac 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -268,6 +268,55 @@ void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
>   }
>   
>   /**
> + * amdgpu_vm_move_to_lru_tail - move one list of BOs to end of LRU
> + *
> + * @adev: amdgpu device pointer
> + * @vm: vm providing the BOs
> + * @list: the list that stored BOs
> + *
> + * Move one list of BOs to the end of LRU and update the positions.
> + */
> +static void
> +amdgpu_vm_move_to_lru_tail_by_list(struct amdgpu_device *adev,
> +				   struct amdgpu_vm *vm, struct list_head *list)

Am I blind or is adev not actually used in the function?

> +{
> +	struct amdgpu_vm_bo_base *bo_base, *tmp;
> +
> +	list_for_each_entry_safe(bo_base, tmp, list, vm_status) {

No need for the _safe variant as far as I can see.

Apart from that this looks good to me.

Christian.

> +		struct amdgpu_bo *bo = bo_base->bo;
> +
> +		if (!bo->parent)
> +			continue;
> +
> +		ttm_bo_move_to_lru_tail(&bo->tbo, &vm->lru_bulk_move);
> +		if (bo->shadow)
> +			ttm_bo_move_to_lru_tail(&bo->shadow->tbo,
> +						&vm->lru_bulk_move);
> +	}
> +}
> +
> +/**
> + * amdgpu_vm_move_to_lru_tail - move all BOs to the end of LRU
> + *
> + * @adev: amdgpu device pointer
> + * @vm: vm providing the BOs
> + *
> + * Move all BOs to the end of LRU and remember their positions to put them
> + * together.
> + */
> +static void
> +amdgpu_vm_move_to_lru_tail(struct amdgpu_device *adev, struct amdgpu_vm *vm)
> +{
> +	struct ttm_bo_global *glob = adev->mman.bdev.glob;
> +
> +	spin_lock(&glob->lru_lock);
> +	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->idle);
> +	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->relocated);
> +	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->moved);
> +	spin_unlock(&glob->lru_lock);
> +}
> +
> +/**
>    * amdgpu_vm_validate_pt_bos - validate the page table BOs
>    *
>    * @adev: amdgpu device pointer
> @@ -286,6 +335,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   {
>   	struct ttm_bo_global *glob = adev->mman.bdev.glob;
>   	struct amdgpu_vm_bo_base *bo_base, *tmp;
> +	bool validated = false;
>   	int r = 0;
>   
>   	list_for_each_entry_safe(bo_base, tmp, &vm->evicted, vm_status) {
> @@ -295,14 +345,9 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   			r = validate(param, bo);
>   			if (r)
>   				break;
> -
> -			spin_lock(&glob->lru_lock);
> -			ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
> -			if (bo->shadow)
> -				ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
> -			spin_unlock(&glob->lru_lock);
>   		}
>   
> +		validated = true;
>   		if (bo->tbo.type != ttm_bo_type_kernel) {
>   			spin_lock(&vm->moved_lock);
>   			list_move(&bo_base->vm_status, &vm->moved);
> @@ -312,18 +357,16 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   		}
>   	}
>   
> -	spin_lock(&glob->lru_lock);
> -	list_for_each_entry(bo_base, &vm->idle, vm_status) {
> -		struct amdgpu_bo *bo = bo_base->bo;
> +	if (!validated) {
> +		spin_lock(&glob->lru_lock);
> +		ttm_bo_bulk_move_lru_tail(&vm->lru_bulk_move);
> +		spin_unlock(&glob->lru_lock);
> +		return 0;
> +	}
>   
> -		if (!bo->parent)
> -			continue;
> +	memset(&vm->lru_bulk_move, 0, sizeof(vm->lru_bulk_move));
>   
> -		ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
> -		if (bo->shadow)
> -			ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
> -	}
> -	spin_unlock(&glob->lru_lock);
> +	amdgpu_vm_move_to_lru_tail(adev, vm);
>   
>   	return r;
>   }
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index 67a15d4..92725ac 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -29,6 +29,7 @@
>   #include <linux/rbtree.h>
>   #include <drm/gpu_scheduler.h>
>   #include <drm/drm_file.h>
> +#include <drm/ttm/ttm_bo_driver.h>
>   
>   #include "amdgpu_sync.h"
>   #include "amdgpu_ring.h"
> @@ -226,6 +227,9 @@ struct amdgpu_vm {
>   
>   	/* Some basic info about the task */
>   	struct amdgpu_task_info task_info;
> +
> +	/* Store positions of group of BOs */
> +	struct ttm_lru_bulk_move lru_bulk_move;
>   };
>   
>   struct amdgpu_vm_manager {

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Re: [PATCH v2 4/5] drm/amdgpu: use bulk moves for efficient VM LRU handling (v2)

[Huang Rui]

On Fri, Aug 10, 2018 at 10:18:24PM +0800, Koenig, Christian wrote:
> Am 10.08.2018 um 13:55 schrieb Huang Rui:
> > I continue to work for bulk moving that based on the proposal by Christian.
> >
> > Background:
> > amdgpu driver will move all PD/PT and PerVM BOs into idle list. Then move all of
> > them on the end of LRU list one by one. Thus, that cause so many BOs moved to
> > the end of the LRU, and impact performance seriously.
> >
> > Then Christian provided a workaround to not move PD/PT BOs on LRU with below
> > patch:
> > "drm/amdgpu: band aid validating VM PTs"
> > Commit 0bbf32026cf5ba41e9922b30e26e1bed1ecd38ae
> >
> > However, the final solution should bulk move all PD/PT and PerVM BOs on the LRU
> > instead of one by one.
> >
> > Whenever amdgpu_vm_validate_pt_bos() is called and we have BOs which need to be
> > validated we move all BOs together to the end of the LRU without dropping the
> > lock for the LRU.
> >
> > While doing so we note the beginning and end of this block in the LRU list.
> >
> > Now when amdgpu_vm_validate_pt_bos() is called and we don't have anything to do,
> > we don't move every BO one by one, but instead cut the LRU list into pieces so
> > that we bulk move everything to the end in just one operation.
> >
> > Test data:
> > +--------------+-----------------+-----------+---------------------------------------+
> > |              |The Talos        |Clpeak(OCL)|BusSpeedReadback(OCL)                  |
> > |              |Principle(Vulkan)|           |                                       |
> > +------------------------------------------------------------------------------------+
> > |              |                 |           |0.319 ms(1k) 0.314 ms(2K) 0.308 ms(4K) |
> > | Original     |  147.7 FPS      |  76.86 us |0.307 ms(8K) 0.310 ms(16K)             |
> > +------------------------------------------------------------------------------------+
> > | Orignial + WA|                 |           |0.254 ms(1K) 0.241 ms(2K)              |
> > |(don't move   |  162.1 FPS      |  42.15 us |0.230 ms(4K) 0.223 ms(8K) 0.204 ms(16K)|
> > |PT BOs on LRU)|                 |           |                                       |
> > +------------------------------------------------------------------------------------+
> > | Bulk move    |  163.1 FPS      |  40.52 us |0.244 ms(1K) 0.252 ms(2K) 0.213 ms(4K) |
> > |              |                 |           |0.214 ms(8K) 0.225 ms(16K)             |
> > +--------------+-----------------+-----------+---------------------------------------+
> >
> > After test them with above three benchmarks include vulkan and opencl. We can
> > see the visible improvement than original, and even better than original with
> > workaround.
> >
> > v2: move all BOs include idle, relocated, and moved list to the end of LRU and
> > put them together.
> >
> > Signed-off-by: Christian König <christian.koenig@amd.com>
> > Signed-off-by: Huang Rui <ray.huang@amd.com>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 75 ++++++++++++++++++++++++++--------
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  4 ++
> >   2 files changed, 63 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > index 9c84770..81fb1ac 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> > @@ -268,6 +268,55 @@ void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
> >   }
> >   
> >   /**
> > + * amdgpu_vm_move_to_lru_tail - move one list of BOs to end of LRU
> > + *
> > + * @adev: amdgpu device pointer
> > + * @vm: vm providing the BOs
> > + * @list: the list that stored BOs
> > + *
> > + * Move one list of BOs to the end of LRU and update the positions.
> > + */
> > +static void
> > +amdgpu_vm_move_to_lru_tail_by_list(struct amdgpu_device *adev,
> > +				   struct amdgpu_vm *vm, struct list_head *list)
> 
> Am I blind or is adev not actually used in the function?
> 

No, what you see is definitely real. ;-)
That's my fault to add an unused adev int the function. Will remove it in
next version.

> > +{
> > +	struct amdgpu_vm_bo_base *bo_base, *tmp;
> > +
> > +	list_for_each_entry_safe(bo_base, tmp, list, vm_status) {
> 
> No need for the _safe variant as far as I can see.
> 

Yes, we won't move vm->vm_status to another list in the loop.

Thanks,
Ray

> Apart from that this looks good to me.
> 
> Christian.
> 
> > +		struct amdgpu_bo *bo = bo_base->bo;
> > +
> > +		if (!bo->parent)
> > +			continue;
> > +
> > +		ttm_bo_move_to_lru_tail(&bo->tbo, &vm->lru_bulk_move);
> > +		if (bo->shadow)
> > +			ttm_bo_move_to_lru_tail(&bo->shadow->tbo,
> > +						&vm->lru_bulk_move);
> > +	}
> > +}
> > +
> > +/**
> > + * amdgpu_vm_move_to_lru_tail - move all BOs to the end of LRU
> > + *
> > + * @adev: amdgpu device pointer
> > + * @vm: vm providing the BOs
> > + *
> > + * Move all BOs to the end of LRU and remember their positions to put them
> > + * together.
> > + */
> > +static void
> > +amdgpu_vm_move_to_lru_tail(struct amdgpu_device *adev, struct amdgpu_vm *vm)
> > +{
> > +	struct ttm_bo_global *glob = adev->mman.bdev.glob;
> > +
> > +	spin_lock(&glob->lru_lock);
> > +	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->idle);
> > +	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->relocated);
> > +	amdgpu_vm_move_to_lru_tail_by_list(adev, vm, &vm->moved);
> > +	spin_unlock(&glob->lru_lock);
> > +}
> > +
> > +/**
> >    * amdgpu_vm_validate_pt_bos - validate the page table BOs
> >    *
> >    * @adev: amdgpu device pointer
> > @@ -286,6 +335,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> >   {
> >   	struct ttm_bo_global *glob = adev->mman.bdev.glob;
> >   	struct amdgpu_vm_bo_base *bo_base, *tmp;
> > +	bool validated = false;
> >   	int r = 0;
> >   
> >   	list_for_each_entry_safe(bo_base, tmp, &vm->evicted, vm_status) {
> > @@ -295,14 +345,9 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> >   			r = validate(param, bo);
> >   			if (r)
> >   				break;
> > -
> > -			spin_lock(&glob->lru_lock);
> > -			ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
> > -			if (bo->shadow)
> > -				ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
> > -			spin_unlock(&glob->lru_lock);
> >   		}
> >   
> > +		validated = true;
> >   		if (bo->tbo.type != ttm_bo_type_kernel) {
> >   			spin_lock(&vm->moved_lock);
> >   			list_move(&bo_base->vm_status, &vm->moved);
> > @@ -312,18 +357,16 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
> >   		}
> >   	}
> >   
> > -	spin_lock(&glob->lru_lock);
> > -	list_for_each_entry(bo_base, &vm->idle, vm_status) {
> > -		struct amdgpu_bo *bo = bo_base->bo;
> > +	if (!validated) {
> > +		spin_lock(&glob->lru_lock);
> > +		ttm_bo_bulk_move_lru_tail(&vm->lru_bulk_move);
> > +		spin_unlock(&glob->lru_lock);
> > +		return 0;
> > +	}
> >   
> > -		if (!bo->parent)
> > -			continue;
> > +	memset(&vm->lru_bulk_move, 0, sizeof(vm->lru_bulk_move));
> >   
> > -		ttm_bo_move_to_lru_tail(&bo->tbo, NULL);
> > -		if (bo->shadow)
> > -			ttm_bo_move_to_lru_tail(&bo->shadow->tbo, NULL);
> > -	}
> > -	spin_unlock(&glob->lru_lock);
> > +	amdgpu_vm_move_to_lru_tail(adev, vm);
> >   
> >   	return r;
> >   }
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> > index 67a15d4..92725ac 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> > @@ -29,6 +29,7 @@
> >   #include <linux/rbtree.h>
> >   #include <drm/gpu_scheduler.h>
> >   #include <drm/drm_file.h>
> > +#include <drm/ttm/ttm_bo_driver.h>
> >   
> >   #include "amdgpu_sync.h"
> >   #include "amdgpu_ring.h"
> > @@ -226,6 +227,9 @@ struct amdgpu_vm {
> >   
> >   	/* Some basic info about the task */
> >   	struct amdgpu_task_info task_info;
> > +
> > +	/* Store positions of group of BOs */
> > +	struct ttm_lru_bulk_move lru_bulk_move;
> >   };
> >   
> >   struct amdgpu_vm_manager {
> 
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Re: [PATCH v2 0/5] drm/ttm, amdgpu: Introduce LRU bulk move functionality

[Mike Lothian]

[-- Attachment #1.1: Type: text/plain, Size: 3978 bytes --]

Hi

I've been testing these patches over the weekend on my Tonga and Raven
systems

Tested-by: Mike Lothian <mike-4+n8WJKc9ve9FHfhHBbuYA@public.gmane.org>

Cheers

Mike

On Fri, 10 Aug 2018 at 12:56 Huang Rui <ray.huang-5C7GfCeVMHo@public.gmane.org> wrote:

> The idea and proposal is originally from Christian, and I continue to work
> to
> deliver it.
>
> Background:
> amdgpu driver will move all PD/PT and PerVM BOs into idle list. Then move
> all of
> them on the end of LRU list one by one. Thus, that cause so many BOs moved
> to
> the end of the LRU, and impact performance seriously.
>
> Then Christian provided a workaround to not move PD/PT BOs on LRU with
> below
> patch:
> "drm/amdgpu: band aid validating VM PTs"
> Commit 0bbf32026cf5ba41e9922b30e26e1bed1ecd38ae
>
> However, the final solution should bulk move all PD/PT and PerVM BOs on
> the LRU
> instead of one by one.
>
> Whenever amdgpu_vm_validate_pt_bos() is called and we have BOs which need
> to be
> validated we move all BOs together to the end of the LRU without dropping
> the
> lock for the LRU.
>
> While doing so we note the beginning and end of this block in the LRU list.
>
> Now when amdgpu_vm_validate_pt_bos() is called and we don't have anything
> to do,
> we don't move every BO one by one, but instead cut the LRU list into
> pieces so
> that we bulk move everything to the end in just one operation.
>
> Test data:
>
> +--------------+-----------------+-----------+---------------------------------------+
> |              |The Talos        |Clpeak(OCL)|BusSpeedReadback(OCL)
>           |
> |              |Principle(Vulkan)|           |
>            |
>
> +------------------------------------------------------------------------------------+
> |              |                 |           |0.319 ms(1k) 0.314 ms(2K)
> 0.308 ms(4K) |
> | Original     |  147.7 FPS      |  76.86 us |0.307 ms(8K) 0.310 ms(16K)
>            |
>
> +------------------------------------------------------------------------------------+
> | Orignial + WA|                 |           |0.254 ms(1K) 0.241 ms(2K)
>           |
> |(don't move   |  162.1 FPS      |  42.15 us |0.230 ms(4K) 0.223 ms(8K)
> 0.204 ms(16K)|
> |PT BOs on LRU)|                 |           |
>            |
>
> +------------------------------------------------------------------------------------+
> | Bulk move    |  163.1 FPS      |  40.52 us |0.244 ms(1K) 0.252 ms(2K)
> 0.213 ms(4K) |
> |              |                 |           |0.214 ms(8K) 0.225 ms(16K)
>            |
>
> +--------------+-----------------+-----------+---------------------------------------+
>
> After test them with above three benchmarks include vulkan and opencl. We
> can
> see the visible improvement than original, and even better than original
> with
> workaround.
>
> Changes from V1 -> V2:
> - Fix to missed the BOs in relocated/moved that should be also moved to
> the end
>   of LRU.
>
> Thanks,
> Rui
>
> Christian König (2):
>   drm/ttm: add helper structures for bulk moves on lru list
>   drm/ttm: revise ttm_bo_move_to_lru_tail to support bulk moves
>
> Huang Rui (3):
>   drm/ttm: add bulk move function on LRU
>   drm/amdgpu: use bulk moves for efficient VM LRU handling (v2)
>   drm/amdgpu: move PD/PT bos on LRU again
>
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 77
> +++++++++++++++++++++++++--------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  4 ++
>  drivers/gpu/drm/ttm/ttm_bo.c           | 78
> +++++++++++++++++++++++++++++++++-
>  include/drm/ttm/ttm_bo_api.h           | 16 ++++++-
>  include/drm/ttm/ttm_bo_driver.h        | 28 ++++++++++++
>  5 files changed, 184 insertions(+), 19 deletions(-)
>
> --
> 2.7.4
>
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Re: [PATCH v2 0/5] drm/ttm, amdgpu: Introduce LRU bulk move functionality

[Huang Rui]

On Sun, Aug 12, 2018 at 10:12:56PM +0100, Mike Lothian wrote:
> Hi
> 
> I've been testing these patches over the weekend on my Tonga and Raven
> systems
> 
> Tested-by: Mike Lothian <mike@fireburn.co.uk>
> 

Thanks so much, Mike. I will add your tested-by in my next version.

Thanks,
Ray

> Cheers
> 
> Mike
> 
> On Fri, 10 Aug 2018 at 12:56 Huang Rui <ray.huang@amd.com> wrote:
> 
> > The idea and proposal is originally from Christian, and I continue to work
> > to
> > deliver it.
> >
> > Background:
> > amdgpu driver will move all PD/PT and PerVM BOs into idle list. Then move
> > all of
> > them on the end of LRU list one by one. Thus, that cause so many BOs moved
> > to
> > the end of the LRU, and impact performance seriously.
> >
> > Then Christian provided a workaround to not move PD/PT BOs on LRU with
> > below
> > patch:
> > "drm/amdgpu: band aid validating VM PTs"
> > Commit 0bbf32026cf5ba41e9922b30e26e1bed1ecd38ae
> >
> > However, the final solution should bulk move all PD/PT and PerVM BOs on
> > the LRU
> > instead of one by one.
> >
> > Whenever amdgpu_vm_validate_pt_bos() is called and we have BOs which need
> > to be
> > validated we move all BOs together to the end of the LRU without dropping
> > the
> > lock for the LRU.
> >
> > While doing so we note the beginning and end of this block in the LRU list.
> >
> > Now when amdgpu_vm_validate_pt_bos() is called and we don't have anything
> > to do,
> > we don't move every BO one by one, but instead cut the LRU list into
> > pieces so
> > that we bulk move everything to the end in just one operation.
> >
> > Test data:
> >
> > +--------------+-----------------+-----------+---------------------------------------+
> > |              |The Talos        |Clpeak(OCL)|BusSpeedReadback(OCL)
> >           |
> > |              |Principle(Vulkan)|           |
> >            |
> >
> > +------------------------------------------------------------------------------------+
> > |              |                 |           |0.319 ms(1k) 0.314 ms(2K)
> > 0.308 ms(4K) |
> > | Original     |  147.7 FPS      |  76.86 us |0.307 ms(8K) 0.310 ms(16K)
> >            |
> >
> > +------------------------------------------------------------------------------------+
> > | Orignial + WA|                 |           |0.254 ms(1K) 0.241 ms(2K)
> >           |
> > |(don't move   |  162.1 FPS      |  42.15 us |0.230 ms(4K) 0.223 ms(8K)
> > 0.204 ms(16K)|
> > |PT BOs on LRU)|                 |           |
> >            |
> >
> > +------------------------------------------------------------------------------------+
> > | Bulk move    |  163.1 FPS      |  40.52 us |0.244 ms(1K) 0.252 ms(2K)
> > 0.213 ms(4K) |
> > |              |                 |           |0.214 ms(8K) 0.225 ms(16K)
> >            |
> >
> > +--------------+-----------------+-----------+---------------------------------------+
> >
> > After test them with above three benchmarks include vulkan and opencl. We
> > can
> > see the visible improvement than original, and even better than original
> > with
> > workaround.
> >
> > Changes from V1 -> V2:
> > - Fix to missed the BOs in relocated/moved that should be also moved to
> > the end
> >   of LRU.
> >
> > Thanks,
> > Rui
> >
> > Christian König (2):
> >   drm/ttm: add helper structures for bulk moves on lru list
> >   drm/ttm: revise ttm_bo_move_to_lru_tail to support bulk moves
> >
> > Huang Rui (3):
> >   drm/ttm: add bulk move function on LRU
> >   drm/amdgpu: use bulk moves for efficient VM LRU handling (v2)
> >   drm/amdgpu: move PD/PT bos on LRU again
> >
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 77
> > +++++++++++++++++++++++++--------
> >  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |  4 ++
> >  drivers/gpu/drm/ttm/ttm_bo.c           | 78
> > +++++++++++++++++++++++++++++++++-
> >  include/drm/ttm/ttm_bo_api.h           | 16 ++++++-
> >  include/drm/ttm/ttm_bo_driver.h        | 28 ++++++++++++
> >  5 files changed, 184 insertions(+), 19 deletions(-)
> >
> > --
> > 2.7.4
> >
> > _______________________________________________
> > amd-gfx mailing list
> > amd-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/amd-gfx
> >

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