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

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

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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