Add ion cached pool in system heap. This patch add a cached pool
in system heap. It has a great improvement of alloc for cached
buffer.
With memory pressue alloc test 800MB in userspace used iontest.
The result avg is 577ms. Without patch it's avg is about 883ms.
v1: Makes the cached buffer zeroed before going to pool
v2: Add cached param in pool to distinguish wheather need to flush
cache at a fresh alloc.
Rework the shrink function.
Signed-off-by: Chen Feng <puck.chen@xxxxxxxxxxxxx>
Signed-off-by: Xia Qing <saberlily.xia@xxxxxxxxxxxxx>
Reviewed-by: Fu Jun <oliver.fu@xxxxxxxxxxxxx>
---
drivers/staging/android/ion/ion_page_pool.c | 10 +-
drivers/staging/android/ion/ion_priv.h | 5 +-
drivers/staging/android/ion/ion_system_heap.c | 183 +++++++++++++++++---------
3 files changed, 133 insertions(+), 65 deletions(-)
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index 1fe8016..2c5e5c5 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -30,8 +30,9 @@ static void *ion_page_pool_alloc_pages(struct ion_page_pool *pool)
if (!page)
return NULL;
- ion_pages_sync_for_device(NULL, page, PAGE_SIZE << pool->order,
- DMA_BIDIRECTIONAL);
+ if (!pool->cached)
+ ion_pages_sync_for_device(NULL, page, PAGE_SIZE << pool->order,
+ DMA_BIDIRECTIONAL);
return page;
}
@@ -147,7 +148,8 @@ int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
return freed;
}
-struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
+struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order,
+ bool cached)
{
struct ion_page_pool *pool = kmalloc(sizeof(*pool), GFP_KERNEL);
@@ -161,6 +163,8 @@ struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
pool->order = order;
mutex_init(&pool->mutex);
plist_node_init(&pool->list, order);
+ if (cached)
+ pool->cached = true;
return pool;
}
diff --git a/drivers/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h
index 0239883..f3cb8b4 100644
--- a/drivers/staging/android/ion/ion_priv.h
+++ b/drivers/staging/android/ion/ion_priv.h
@@ -360,6 +360,7 @@ void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
* @gfp_mask: gfp_mask to use from alloc
* @order: order of pages in the pool
* @list: plist node for list of pools
+ * @cached: it's cached pool or not
*
* Allows you to keep a pool of pre allocated pages to use from your heap.
* Keeping a pool of pages that is ready for dma, ie any cached mapping have
@@ -369,6 +370,7 @@ void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
struct ion_page_pool {
int high_count;
int low_count;
+ bool cached;
struct list_head high_items;
struct list_head low_items;
struct mutex mutex;
@@ -377,7 +379,8 @@ struct ion_page_pool {
struct plist_node list;
};
-struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
+struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order,
+ bool cached);
void ion_page_pool_destroy(struct ion_page_pool *);
struct page *ion_page_pool_alloc(struct ion_page_pool *);
void ion_page_pool_free(struct ion_page_pool *, struct page *);
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index b69dfc7..32a0ebf 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -26,16 +26,18 @@
#include "ion.h"
#include "ion_priv.h"
+#define NUM_ORDERS ARRAY_SIZE(orders)
+
static gfp_t high_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN |
__GFP_NORETRY) & ~__GFP_RECLAIM;
static gfp_t low_order_gfp_flags = (GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN);
static const unsigned int orders[] = {8, 4, 0};
-static const int num_orders = ARRAY_SIZE(orders);
+
static int order_to_index(unsigned int order)
{
int i;
- for (i = 0; i < num_orders; i++)
+ for (i = 0; i < NUM_ORDERS; i++)
if (order == orders[i])
return i;
BUG();
@@ -49,47 +51,55 @@ static inline unsigned int order_to_size(int order)
struct ion_system_heap {
struct ion_heap heap;
- struct ion_page_pool *pools[0];
+ struct ion_page_pool *uncached_pools[NUM_ORDERS];
+ struct ion_page_pool *cached_pools[NUM_ORDERS];
};
+/**
+ * The page from page-pool are all zeroed before. We need do cache
+ * clean for cached buffer. The uncached buffer are always non-cached
+ * since it's allocated. So no need for non-cached pages.
+ */
static struct page *alloc_buffer_page(struct ion_system_heap *heap,
struct ion_buffer *buffer,
unsigned long order)
{
bool cached = ion_buffer_cached(buffer);
- struct ion_page_pool *pool = heap->pools[order_to_index(order)];
+ struct ion_page_pool *pool;
struct page *page;
- if (!cached) {
- page = ion_page_pool_alloc(pool);
- } else {
- gfp_t gfp_flags = low_order_gfp_flags;
+ if (!cached)
+ pool = heap->uncached_pools[order_to_index(order)];
+ else
+ pool = heap->cached_pools[order_to_index(order)];
- if (order > 4)
- gfp_flags = high_order_gfp_flags;
- page = alloc_pages(gfp_flags | __GFP_COMP, order);
- if (!page)
- return NULL;
- ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order,
- DMA_BIDIRECTIONAL);
- }
+ page = ion_page_pool_alloc(pool);
+ if (cached)
+ ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order,
+ DMA_BIDIRECTIONAL);
return page;
}
static void free_buffer_page(struct ion_system_heap *heap,
struct ion_buffer *buffer, struct page *page)
{
+ struct ion_page_pool *pool;
unsigned int order = compound_order(page);
bool cached = ion_buffer_cached(buffer);
- if (!cached && !(buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE)) {
- struct ion_page_pool *pool = heap->pools[order_to_index(order)];
-
- ion_page_pool_free(pool, page);
- } else {
+ /* go to system */
+ if (buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE) {
__free_pages(page, order);
+ return;
}
+
+ if (!cached)
+ pool = heap->uncached_pools[order_to_index(order)];
+ else
+ pool = heap->cached_pools[order_to_index(order)];
+
+ ion_page_pool_free(pool, page);
}
@@ -101,7 +111,7 @@ static struct page *alloc_largest_available(struct ion_system_heap *heap,
struct page *page;
int i;
- for (i = 0; i < num_orders; i++) {
+ for (i = 0; i < NUM_ORDERS; i++) {
if (size < order_to_size(orders[i]))
continue;
if (max_order < orders[i])
@@ -181,16 +191,11 @@ static void ion_system_heap_free(struct ion_buffer *buffer)
struct ion_system_heap,
heap);
struct sg_table *table = buffer->sg_table;
- bool cached = ion_buffer_cached(buffer);
struct scatterlist *sg;
int i;
- /*
- * uncached pages come from the page pools, zero them before returning
- * for security purposes (other allocations are zerod at
- * alloc time
- */
- if (!cached && !(buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE))
+ /* zero the buffer before goto page pool */
+ if (!(buffer->private_flags & ION_PRIV_FLAG_SHRINKER_FREE))
ion_heap_buffer_zero(buffer);
for_each_sg(table->sgl, sg, table->nents, i)
@@ -213,6 +218,8 @@ static void ion_system_heap_unmap_dma(struct ion_heap *heap,
static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
int nr_to_scan)
{
+ struct ion_page_pool *uncached_pool;
+ struct ion_page_pool *cached_pool;
struct ion_system_heap *sys_heap;
int nr_total = 0;
int i, nr_freed;
@@ -223,20 +230,35 @@ static int ion_system_heap_shrink(struct ion_heap *heap, gfp_t gfp_mask,
if (!nr_to_scan)
only_scan = 1;
- for (i = 0; i < num_orders; i++) {
- struct ion_page_pool *pool = sys_heap->pools[i];
-
- nr_freed = ion_page_pool_shrink(pool, gfp_mask, nr_to_scan);
- nr_total += nr_freed;
-
- if (!only_scan) {
+ for (i = 0; i < NUM_ORDERS; i++) {
+ uncached_pool = sys_heap->uncached_pools[i];
+ cached_pool = sys_heap->cached_pools[i];
+
+ if (only_scan) {
+ nr_total += ion_page_pool_shrink(uncached_pool,
+ gfp_mask,
+ nr_to_scan);
+
+ nr_total += ion_page_pool_shrink(cached_pool,
+ gfp_mask,
+ nr_to_scan);
+ } else {
+ nr_freed = ion_page_pool_shrink(uncached_pool,
+ gfp_mask,
+ nr_to_scan);
nr_to_scan -= nr_freed;
- /* shrink completed */
+ nr_total += nr_freed;
+ if (nr_to_scan <= 0)
+ break;
+ nr_freed = ion_page_pool_shrink(cached_pool,
+ gfp_mask,
+ nr_to_scan);
+ nr_to_scan -= nr_freed;
+ nr_total += nr_freed;
if (nr_to_scan <= 0)
break;
}
}
-
return nr_total;
}
@@ -259,52 +281,89 @@ static int ion_system_heap_debug_show(struct ion_heap *heap, struct seq_file *s,
struct ion_system_heap,
heap);
int i;
+ struct ion_page_pool *pool;
- for (i = 0; i < num_orders; i++) {
- struct ion_page_pool *pool = sys_heap->pools[i];
+ for (i = 0; i < NUM_ORDERS; i++) {
+ pool = sys_heap->uncached_pools[i];
- seq_printf(s, "%d order %u highmem pages in pool = %lu total\n",
+ seq_printf(s, "%d order %u highmem pages uncached %lu total\n",
pool->high_count, pool->order,
(PAGE_SIZE << pool->order) * pool->high_count);
- seq_printf(s, "%d order %u lowmem pages in pool = %lu total\n",
+ seq_printf(s, "%d order %u lowmem pages uncached %lu total\n",
+ pool->low_count, pool->order,
+ (PAGE_SIZE << pool->order) * pool->low_count);
+ }
+
+ for (i = 0; i < NUM_ORDERS; i++) {
+ pool = sys_heap->cached_pools[i];
+
+ seq_printf(s, "%d order %u highmem pages cached %lu total\n",
+ pool->high_count, pool->order,
+ (PAGE_SIZE << pool->order) * pool->high_count);
+ seq_printf(s, "%d order %u lowmem pages cached %lu total\n",
pool->low_count, pool->order,
(PAGE_SIZE << pool->order) * pool->low_count);
}
return 0;
}
+static void ion_system_heap_destroy_pools(struct ion_page_pool **pools)
+{
+ int i;
+
+ for (i = 0; i < NUM_ORDERS; i++)
+ if (pools[i])
+ ion_page_pool_destroy(pools[i]);
+}
+
+static int ion_system_heap_create_pools(struct ion_page_pool **pools,
+ bool cached)
+{
+ int i;
+ gfp_t gfp_flags = low_order_gfp_flags;
+
+ for (i = 0; i < NUM_ORDERS; i++) {
+ struct ion_page_pool *pool;
+
+ if (orders[i] > 4)
+ gfp_flags = high_order_gfp_flags;
+
+ pool = ion_page_pool_create(gfp_flags, orders[i], cached);
+ if (!pool)
+ goto err_create_pool;
+ pools[i] = pool;
+ }
+ return 0;
+
+err_create_pool:
+ ion_system_heap_destroy_pools(pools);
+ return -ENOMEM;
+}
+
struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
{
struct ion_system_heap *heap;
- int i;
- heap = kzalloc(sizeof(struct ion_system_heap) +
- sizeof(struct ion_page_pool *) * num_orders,
- GFP_KERNEL);
+ heap = kzalloc(sizeof(*heap), GFP_KERNEL);
if (!heap)
return ERR_PTR(-ENOMEM);
heap->heap.ops = &system_heap_ops;
heap->heap.type = ION_HEAP_TYPE_SYSTEM;
heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
- for (i = 0; i < num_orders; i++) {
- struct ion_page_pool *pool;
- gfp_t gfp_flags = low_order_gfp_flags;
+ if (ion_system_heap_create_pools(heap->uncached_pools, false))
+ goto free_heap;
- if (orders[i] > 4)
- gfp_flags = high_order_gfp_flags;
- pool = ion_page_pool_create(gfp_flags, orders[i]);
- if (!pool)
- goto destroy_pools;
- heap->pools[i] = pool;
- }
+ if (ion_system_heap_create_pools(heap->cached_pools, true))
+ goto destroy_uncached_pools;
heap->heap.debug_show = ion_system_heap_debug_show;
return &heap->heap;
-destroy_pools:
- while (i--)
- ion_page_pool_destroy(heap->pools[i]);
+destroy_uncached_pools:
+ ion_system_heap_destroy_pools(heap->uncached_pools);
+
+free_heap:
kfree(heap);
return ERR_PTR(-ENOMEM);
}
@@ -316,8 +375,10 @@ void ion_system_heap_destroy(struct ion_heap *heap)
heap);
int i;
- for (i = 0; i < num_orders; i++)
- ion_page_pool_destroy(sys_heap->pools[i]);
+ for (i = 0; i < NUM_ORDERS; i++) {
+ ion_page_pool_destroy(sys_heap->uncached_pools[i]);
+ ion_page_pool_destroy(sys_heap->cached_pools[i]);
+ }
kfree(sys_heap);
}
--
1.9.1
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