diff options
Diffstat (limited to 'drivers/staging/android/ion/ion_system_heap.c')
| -rw-r--r-- | drivers/staging/android/ion/ion_system_heap.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c index 6665797f5370..fedbc0d5fa7d 100644 --- a/drivers/staging/android/ion/ion_system_heap.c +++ b/drivers/staging/android/ion/ion_system_heap.c @@ -253,6 +253,50 @@ static struct ion_heap_ops system_heap_ops = { .map_user = ion_heap_map_user, }; +static int ion_system_heap_shrink(struct shrinker *shrinker, + struct shrink_control *sc) { + + struct ion_heap *heap = container_of(shrinker, struct ion_heap, + shrinker); + struct ion_system_heap *sys_heap = container_of(heap, + struct ion_system_heap, + heap); + int nr_total = 0; + int nr_freed = 0; + int i; + + if (sc->nr_to_scan == 0) + goto end; + + /* shrink the free list first, no point in zeroing the memory if + we're just going to reclaim it */ + nr_freed += ion_heap_freelist_drain(heap, sc->nr_to_scan * PAGE_SIZE) / + PAGE_SIZE; + + if (nr_freed >= sc->nr_to_scan) + goto end; + + for (i = 0; i < num_orders; i++) { + struct ion_page_pool *pool = sys_heap->pools[i]; + + nr_freed += ion_page_pool_shrink(pool, sc->gfp_mask, + sc->nr_to_scan); + if (nr_freed >= sc->nr_to_scan) + break; + } + +end: + /* total number of items is whatever the page pools are holding + plus whatever's in the freelist */ + for (i = 0; i < num_orders; i++) { + struct ion_page_pool *pool = sys_heap->pools[i]; + nr_total += ion_page_pool_shrink(pool, sc->gfp_mask, 0); + } + nr_total += ion_heap_freelist_size(heap) / PAGE_SIZE; + return nr_total; + +} + static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s, void *unused) { @@ -299,6 +343,11 @@ struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused) goto err_create_pool; heap->pools[i] = pool; } + + heap->heap.shrinker.shrink = ion_system_heap_shrink; + heap->heap.shrinker.seeks = DEFAULT_SEEKS; + heap->heap.shrinker.batch = 0; + register_shrinker(&heap->heap.shrinker); heap->heap.debug_show = ion_system_heap_debug_show; return &heap->heap; err_create_pool: |