On Mon, Dec 12, 2011 at 3:09 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> We would free the page pool - even if it was for cached pages
> (which are deleted from the pool - so there are no free pages).
>
> Also we also missed the opportunity to batch the amount of pages
> to free (similar to how ttm_page_alloc.c does it). This reintroduces
> the code that was lost during rebasing.
>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
> drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 9 ++++++---
> 1 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> index e57aa24..156ddcd 100644
> --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> @@ -949,7 +949,7 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
> struct dma_page *d_page, *next;
> enum pool_type type;
> bool is_cached = false;
> - unsigned count = 0, i, npages;
> + unsigned count = 0, i, npages = 0;
> unsigned long irq_flags;
>
> type = ttm_to_type(ttm->page_flags, ttm->caching_state);
> @@ -971,13 +971,16 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
> pool->npages_in_use -= count;
> if (is_cached) {
> pool->nfrees += count;
> - npages = count;
See patch 2/3 comment otherwise Reviewed-by: Jerome Glisse <jglisse@xxxxxxxxxx>
> } else {
> pool->npages_free += count;
> list_splice(&ttm_dma->pages_list, &pool->free_list);
> npages = count;
> 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);
> @@ -1001,7 +1004,7 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
> ttm_dma->dma_address[i] = 0;
> }
>
> - /* shrink pool if necessary */
> + /* shrink pool if necessary (only on !is_cached pools)*/
> if (npages)
> ttm_dma_page_pool_free(pool, npages);
> ttm->state = tt_unpopulated;
> --
> 1.7.7.3
>
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