2014-10-28 오전 9:36에 Gioh Kim 이(가) 쓴 글:
> This patch shrink page-pool by page unit.
>
> Shrinker usually get the pool size with the pool-scanner
> and pass the size to the pool-counter to shrink entire pool.
> But the pool-scanner is working in block unit.
> and pool-counter page unit.
> So it is confused.
>
> Signed-off-by: Gioh Kim <gioh....@lge.com>
> ---
> drivers/staging/android/ion/ion_page_pool.c | 5 +++--
> drivers/staging/android/ion/ion_system_heap.c | 7 +++++--
> 2 files changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/android/ion/ion_page_pool.c
> b/drivers/staging/android/ion/ion_page_pool.c
> index 5864f3d..165152f 100644
> --- a/drivers/staging/android/ion/ion_page_pool.c
> +++ b/drivers/staging/android/ion/ion_page_pool.c
> @@ -116,7 +116,7 @@ static int ion_page_pool_total(struct ion_page_pool
> *pool, bool high)
> int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
> int nr_to_scan)
> {
> - int freed;
> + int freed = 0;
> bool high;
>
> if (current_is_kswapd())
> @@ -127,7 +127,7 @@ int ion_page_pool_shrink(struct ion_page_pool *pool,
> gfp_t gfp_mask,
> if (nr_to_scan == 0)
> return ion_page_pool_total(pool, high);
>
> - for (freed = 0; freed < nr_to_scan; freed++) {
> + while (freed <= nr_to_scan) {
> struct page *page;
>
> mutex_lock(&pool->mutex);
> @@ -141,6 +141,7 @@ int ion_page_pool_shrink(struct ion_page_pool *pool,
> gfp_t gfp_mask,
> }
> mutex_unlock(&pool->mutex);
> ion_page_pool_free_pages(pool, page);
> + freed += (1 << pool->order);
> }
>
> return freed;
> diff --git a/drivers/staging/android/ion/ion_system_heap.c
> b/drivers/staging/android/ion/ion_system_heap.c
> index da2a63c..91d862f 100644
> --- a/drivers/staging/android/ion/ion_system_heap.c
> +++ b/drivers/staging/android/ion/ion_system_heap.c
> @@ -211,7 +211,7 @@ static int ion_system_heap_shrink(struct ion_heap *heap,
> gfp_t gfp_mask,
> int nr_to_scan)
> {
> struct ion_system_heap *sys_heap;
> - int nr_total = 0;
> + int nr_total = 0, nr_freed;
> int i;
>
> sys_heap = container_of(heap, struct ion_system_heap, heap);
> @@ -219,7 +219,10 @@ static int ion_system_heap_shrink(struct ion_heap *heap,
> gfp_t gfp_mask,
> for (i = 0; i < num_orders; i++) {
> struct ion_page_pool *pool = sys_heap->pools[i];
>
> - nr_total += ion_page_pool_shrink(pool, gfp_mask, nr_to_scan);
> + nr_freed = ion_page_pool_shrink(pool, gfp_mask, nr_to_scan);
I found a mistake that if nr_to_scan is 0, this works wrong.
Please ignore this patch and I'm going to send v2.
> + nr_total += nr_freed;
> + /* nr_to_scan can be negative */
> + nr_to_scan -= nr_freed;
> }
>
> return nr_total;
>
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