lkml.org 
[lkml]   [2015]   [Jul]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCHv3 1/2] staging: ion: shrink page-pool by page unit
From
Date
On 07/01/2015 04:02 AM, Gioh Kim wrote:
> This patch shrink page-pool by page unit.
>
> The system shrinker calls ion_heap_shrink_count() to get nr_to_scan,
> and pass it to ion_heap_shrink_scan().
> The problem is the return value of ion_heap_shrink_count() is the number
> of pages but ion_system_heap_shrink(), which is called by
> ion_heap_shrink_scan(), gets the number of chunk.
>
> The main root of this is that ion_page_pool_shrink() returns page count
> via ion_page_pool_total() if it have to check pool size. But it frees
> chunks of pages if it have to free pools.
>
> This patch first fix ion_page_pool_shrink() to count only pages,
> not chunks. And then ion_system_heap_shrink() to work on pages.
>
> Signed-off-by: Gioh Kim <gioh.kim@lge.com>

Reviewed-by: Laura Abbott <labbott@redhat.com>

> ---
> drivers/staging/android/ion/ion_page_pool.c | 5 +++--
> drivers/staging/android/ion/ion_system_heap.c | 16 ++++++++++++++--
> 2 files changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
> index 4b88f11..19ad3ab 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..7a7a9a0 100644
> --- a/drivers/staging/android/ion/ion_system_heap.c
> +++ b/drivers/staging/android/ion/ion_system_heap.c
> @@ -212,14 +212,26 @@ static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
> {
> struct ion_system_heap *sys_heap;
> int nr_total = 0;
> - int i;
> + int i, nr_freed;
> + int only_scan = 0;
>
> sys_heap = container_of(heap, struct ion_system_heap, heap);
>
> + if (!nr_to_scan)
> + only_scan = 1;
> +
> 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);
> + nr_total += nr_freed;
> +
> + if (!only_scan) {
> + nr_to_scan -= nr_freed;
> + /* shrink completed */
> + if (nr_to_scan <= 0)
> + break;
> + }
> }
>
> return nr_total;
>




\
 
 \ /
  Last update: 2015-07-02 20:41    [W:0.041 / U:0.708 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site