[RFCv2 1/3] staging: ion: shrink page-pool by page unit

[Gioh Kim]

This patch shrink page-pool by page unit.

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);
+               nr_total += nr_freed;
+               /* nr_to_scan can be negative */
+               nr_to_scan -= nr_freed;
        }
 
        return nr_total;
-- 
1.7.9.5

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