[PATCH 1/2] drm/ttm: fix object deallocation to properly fill in the page pool.

[PATCH 1/2] drm/ttm: fix object deallocation to properly fill in the page pool.

[j.glisse]

From: Jérôme Glisse <jglisse@redhat.com>

Current code never allowed the page pool to actualy fill in anyway.
This fix it, so that we only start freeing page from the pool when
we go over the pool size.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Tested-by: Michel Dänzer <michel@daenzer.net>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index c96db43..0194a93 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -953,14 +953,8 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
 	} else {
 		pool->npages_free += count;
 		list_splice(&ttm_dma->pages_list, &pool->free_list);
-		npages = count;
-		if (pool->npages_free > _manager->options.max_size) {
+		if (pool->npages_free > _manager->options.max_size)
 			npages = pool->npages_free - _manager->options.max_size;
-			/* free at least NUM_PAGES_TO_ALLOC number of pages
-			 * to reduce calls to set_memory_wb */
-			if (npages < NUM_PAGES_TO_ALLOC)
-				npages = NUM_PAGES_TO_ALLOC;
-		}
 	}
 	spin_unlock_irqrestore(&pool->lock, irq_flags);
 
-- 
1.8.3.1

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[PATCH 2/2] drm/ttm: improve uncached page deallocation.

[j.glisse]

From: Jérôme Glisse <jglisse@redhat.com>

Calls to set_memory_wb() incure heavy TLB flush and IPI cost. To
minimize those wait until pool grow beyond batch size before
draining the pool.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Cc: Michel Dänzer <michel@daenzer.net>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index 0194a93..8028dd6 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -953,7 +953,12 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
 	} else {
 		pool->npages_free += count;
 		list_splice(&ttm_dma->pages_list, &pool->free_list);
-		if (pool->npages_free > _manager->options.max_size)
+		/*
+		 * Wait to have at at least NUM_PAGES_TO_ALLOC number of pages
+		 * to free in order to minimize calls to set_memory_wb().
+		 */
+		if (pool->npages_free >= (_manager->options.max_size +
+					  NUM_PAGES_TO_ALLOC))
 			npages = pool->npages_free - _manager->options.max_size;
 	}
 	spin_unlock_irqrestore(&pool->lock, irq_flags);
-- 
1.8.3.1

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Re: [PATCH 2/2] drm/ttm: improve uncached page deallocation.

[Konrad Rzeszutek Wilk]

On Wed, Jul 08, 2015 at 02:16:37PM -0400, j.glisse@gmail.com wrote:
> From: Jérôme Glisse <jglisse@redhat.com>
> 
> Calls to set_memory_wb() incure heavy TLB flush and IPI cost. To
> minimize those wait until pool grow beyond batch size before
> draining the pool.
> 
> Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
> Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
> Cc: Michel Dänzer <michel@daenzer.net>
> Cc: Thomas Hellstrom <thellstrom@vmware.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
>  drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> index 0194a93..8028dd6 100644
> --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> @@ -953,7 +953,12 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
>  	} else {
>  		pool->npages_free += count;
>  		list_splice(&ttm_dma->pages_list, &pool->free_list);
> -		if (pool->npages_free > _manager->options.max_size)
> +		/*
> +		 * Wait to have at at least NUM_PAGES_TO_ALLOC number of pages
> +		 * to free in order to minimize calls to set_memory_wb().
> +		 */
> +		if (pool->npages_free >= (_manager->options.max_size +
> +					  NUM_PAGES_TO_ALLOC))
>  			npages = pool->npages_free - _manager->options.max_size;
>  	}
>  	spin_unlock_irqrestore(&pool->lock, irq_flags);
> -- 
> 1.8.3.1
> 
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Re: [PATCH 1/2] drm/ttm: fix object deallocation to properly fill in the page pool.

[Konrad Rzeszutek Wilk]

On Wed, Jul 08, 2015 at 02:16:36PM -0400, j.glisse@gmail.com wrote:
> From: Jérôme Glisse <jglisse@redhat.com>
> 
> Current code never allowed the page pool to actualy fill in anyway.
> This fix it, so that we only start freeing page from the pool when
> we go over the pool size.
> 
> Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
> Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
> Tested-by: Michel Dänzer <michel@daenzer.net>
> Cc: Thomas Hellstrom <thellstrom@vmware.com>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

> ---
>  drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> index c96db43..0194a93 100644
> --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> @@ -953,14 +953,8 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
>  	} else {
>  		pool->npages_free += count;
>  		list_splice(&ttm_dma->pages_list, &pool->free_list);
> -		npages = count;
> -		if (pool->npages_free > _manager->options.max_size) {
> +		if (pool->npages_free > _manager->options.max_size)
>  			npages = pool->npages_free - _manager->options.max_size;
> -			/* free at least NUM_PAGES_TO_ALLOC number of pages
> -			 * to reduce calls to set_memory_wb */
> -			if (npages < NUM_PAGES_TO_ALLOC)
> -				npages = NUM_PAGES_TO_ALLOC;
> -		}
>  	}
>  	spin_unlock_irqrestore(&pool->lock, irq_flags);
>  
> -- 
> 1.8.3.1
> 
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Re: [PATCH 1/2] drm/ttm: fix object deallocation to properly fill in the page pool.

[Michel Dänzer]

On 09.07.2015 03:16, j.glisse@gmail.com wrote:
> From: Jérôme Glisse <jglisse@redhat.com>
> 
> Current code never allowed the page pool to actualy fill in anyway.
> This fix it, so that we only start freeing page from the pool when
> we go over the pool size.
> 
> Signed-off-by: Jérôme Glisse <jglisse@redhat.com>

[...]

> -		if (pool->npages_free > _manager->options.max_size) {
> +		if (pool->npages_free > _manager->options.max_size)
>  			npages = pool->npages_free - _manager->options.max_size;
> -			/* free at least NUM_PAGES_TO_ALLOC number of pages
> -			 * to reduce calls to set_memory_wb */
> -			if (npages < NUM_PAGES_TO_ALLOC)
> -				npages = NUM_PAGES_TO_ALLOC;
> -		}

This should be part of patch 2. With that fixed, both patches are

Reviewed-and-Tested-by: Michel Dänzer <michel.daenzer@amd.com>


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
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