On Mon, Dec 12, 2011 at 3:09 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> The code to figure out how many pages to shrink the pool
> ends up capping the 'count' at _manager->options.max_size - which is OK.
> Except that the 'count' is also used when accounting for how many pages
> are recycled - which we end up with the invalid values. This fixes
> it by using a different value for the amount of pages to shrink.
>
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
> drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 10 ++++++----
> 1 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> index 6c06d0b..e57aa24 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;
> + unsigned count = 0, i, npages;
> unsigned long irq_flags;
>
> type = ttm_to_type(ttm->page_flags, ttm->caching_state);
> @@ -971,11 +971,13 @@ 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;
This is wrong, i thought we didn't wanted to shrink cached page, your
3/3 patch remove this line. Thought i am kind of wondering why we
don't shrink the cached pool, i can't remember the reason.
> } else {
> pool->npages_free += count;
> list_splice(&ttm_dma->pages_list, &pool->free_list);
> + npages = count;
> if (pool->npages_free > _manager->options.max_size) {
> - count = pool->npages_free - _manager->options.max_size;
> + npages = pool->npages_free - _manager->options.max_size;
> }
> }
> spin_unlock_irqrestore(&pool->lock, irq_flags);
> @@ -1000,8 +1002,8 @@ void ttm_dma_unpopulate(struct ttm_dma_tt *ttm_dma, struct device *dev)
> }
>
> /* shrink pool if necessary */
> - if (count)
> - ttm_dma_page_pool_free(pool, count);
> + if (npages)
> + ttm_dma_page_pool_free(pool, npages);
> ttm->state = tt_unpopulated;
> }
> EXPORT_SYMBOL_GPL(ttm_dma_unpopulate);
> --
> 1.7.7.3
>
Otherwise Reviewed-by:Jerome Glisse <jglisse@xxxxxxxxxx>
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