On 02/13/2017 05:28 PM, Nicolai Hähnle wrote:
On 09.02.2017 11:33, Samuel Pitoiset wrote:
Like ttm_bo_validate(), ttm_bo_init() might need to move BO and
the number of bytes moved by TTM should be reported. This can help
the throttle buffer migration mechanism to make a better decision.
Hmm, this could double-count bytes if there's a concurrent CS submission
going on.
You are right.
Thanks Christian for taking care of this.
It's only a heuristic, so I guess it's not too bad, but still - having
at least a comment about this would be nice.
Nicolai
v2: fix computation
Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 3 +--
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 6 ++++++
3 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 402a8954c6d8..5227e4d1d5db 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1720,6 +1720,7 @@ int amdgpu_cs_parser_init(struct
amdgpu_cs_parser *p, void *data);
int amdgpu_cs_get_ring(struct amdgpu_device *adev, u32 ip_type,
u32 ip_instance, u32 ring,
struct amdgpu_ring **out_ring);
+void amdgpu_cs_report_moved_bytes(struct amdgpu_device *adev, u64
num_bytes);
void amdgpu_ttm_placement_from_domain(struct amdgpu_bo *abo, u32
domain);
bool amdgpu_ttm_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page
**pages);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 6e948e4986ec..dade2fa9593a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -351,8 +351,7 @@ static u64
amdgpu_cs_get_threshold_for_moves(struct amdgpu_device *adev)
* submission. This can result in a debt that can stop buffer migrations
* temporarily.
*/
-static void amdgpu_cs_report_moved_bytes(struct amdgpu_device *adev,
- u64 num_bytes)
+void amdgpu_cs_report_moved_bytes(struct amdgpu_device *adev, u64
num_bytes)
{
spin_lock(&adev->mm_stats.lock);
adev->mm_stats.accum_us -= bytes_to_us(adev, num_bytes);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 556236a112c1..4aa2c8a94347 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -323,6 +323,7 @@ int amdgpu_bo_create_restricted(struct
amdgpu_device *adev,
struct amdgpu_bo *bo;
enum ttm_bo_type type;
unsigned long page_align;
+ u64 initial_bytes_moved;
size_t acc_size;
int r;
@@ -399,10 +400,15 @@ int amdgpu_bo_create_restricted(struct
amdgpu_device *adev,
locked = ww_mutex_trylock(&bo->tbo.ttm_resv.lock);
WARN_ON(!locked);
}
+
+ initial_bytes_moved = atomic64_read(&adev->num_bytes_moved);
r = ttm_bo_init(&adev->mman.bdev, &bo->tbo, size, type,
&bo->placement, page_align, !kernel, NULL,
acc_size, sg, resv ? resv : &bo->tbo.ttm_resv,
&amdgpu_ttm_bo_destroy);
+ amdgpu_cs_report_moved_bytes(adev,
+ atomic64_read(&adev->num_bytes_moved) - initial_bytes_moved);
+
if (unlikely(r != 0)) {
if (!resv)
ww_mutex_unlock(&bo->tbo.resv->lock);
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