diff mbox series

driver : staging : ion: optimization for decreasing memory fragmentaion

Message ID 1552561932-23776-1-git-send-email-huangzhaoyang@gmail.com (mailing list archive)
State New, archived
Headers show
Series driver : staging : ion: optimization for decreasing memory fragmentaion | expand

Commit Message

Zhaoyang Huang March 14, 2019, 11:12 a.m. UTC 
From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>

Two action for this patch:
1. set a batch size for system heap's shrinker, which can have it buffer
reasonable page blocks in pool for future allocation.
2. reverse the order sequence when free page blocks, the purpose is also
to have system heap keep as more big blocks as it can.

By testing on an android system with 2G RAM, the changes with setting
batch = 48MB can help reduce the fragmentation obviously and improve
big block allocation speed for 15%.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
---
 drivers/staging/android/ion/ion_heap.c        | 12 +++++++++++-
 drivers/staging/android/ion/ion_system_heap.c |  2 +-
 2 files changed, 12 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c
index 31db510..68aa970 100644
--- a/drivers/staging/android/ion/ion_heap.c
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -16,6 +16,8 @@ 
 #include <linux/vmalloc.h>
 #include "ion.h"
 
+unsigned long ion_heap_batch;
+
 void *ion_heap_map_kernel(struct ion_heap *heap,
 			  struct ion_buffer *buffer)
 {
@@ -303,7 +305,15 @@  int ion_heap_init_shrinker(struct ion_heap *heap)
 	heap->shrinker.count_objects = ion_heap_shrink_count;
 	heap->shrinker.scan_objects = ion_heap_shrink_scan;
 	heap->shrinker.seeks = DEFAULT_SEEKS;
-	heap->shrinker.batch = 0;
+	heap->shrinker.batch = ion_heap_batch;
 
 	return register_shrinker(&heap->shrinker);
 }
+
+static int __init ion_system_heap_batch_init(char *arg)
+{
+	 ion_heap_batch = memparse(arg, NULL);
+
+	return 0;
+}
+early_param("ion_batch", ion_system_heap_batch_init);
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index 701eb9f..d249f8d 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -182,7 +182,7 @@  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++) {
+	for (i = NUM_ORDERS - 1; i >= 0; i--) {
 		pool = sys_heap->pools[i];
 
 		if (only_scan) {