---

yaml
---
r: 257108
b: refs/heads/master
c: d7ec4bf
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 22fe9b54d859e53bfbbbdc1a0a77a82bc453927c
+refs/heads/master: d7ec4bfed6c97405c6417970ba06c439e08ab8e3

trunk/kernel/trace/ring_buffer.c

@@ -1004,9 +1004,14 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
 
 	for (i = 0; i < nr_pages; i++) {
 		struct page *page;
-
+		/*
+		 * __GFP_NORETRY flag makes sure that the allocation fails
+		 * gracefully without invoking oom-killer and the system is
+		 * not destabilized.
+		 */
 		bpage = kzalloc_node(ALIGN(sizeof(*bpage), cache_line_size()),
-				    GFP_KERNEL, cpu_to_node(cpu_buffer->cpu));
+				    GFP_KERNEL | __GFP_NORETRY,
+				    cpu_to_node(cpu_buffer->cpu));
 		if (!bpage)
 			goto free_pages;
 
@@ -1015,7 +1020,7 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer,
 		list_add(&bpage->list, &pages);
 
 		page = alloc_pages_node(cpu_to_node(cpu_buffer->cpu),
-					GFP_KERNEL, 0);
+					GFP_KERNEL | __GFP_NORETRY, 0);
 		if (!page)
 			goto free_pages;
 		bpage->page = page_address(page);
@@ -1377,13 +1382,20 @@ int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size)
 	for_each_buffer_cpu(buffer, cpu) {
 		for (i = 0; i < new_pages; i++) {
 			struct page *page;
+			/*
+			 * __GFP_NORETRY flag makes sure that the allocation
+			 * fails gracefully without invoking oom-killer and
+			 * the system is not destabilized.
+			 */
 			bpage = kzalloc_node(ALIGN(sizeof(*bpage),
 						  cache_line_size()),
-					    GFP_KERNEL, cpu_to_node(cpu));
+					    GFP_KERNEL | __GFP_NORETRY,
+					    cpu_to_node(cpu));
 			if (!bpage)
 				goto free_pages;
 			list_add(&bpage->list, &pages);
-			page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL, 0);
+			page = alloc_pages_node(cpu_to_node(cpu),
+						GFP_KERNEL | __GFP_NORETRY, 0);
 			if (!page)
 				goto free_pages;
 			bpage->page = page_address(page);
@@ -3737,7 +3749,8 @@ void *ring_buffer_alloc_read_page(struct ring_buffer *buffer, int cpu)
 	struct buffer_data_page *bpage;
 	struct page *page;
 
-	page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL, 0);
+	page = alloc_pages_node(cpu_to_node(cpu),
+				GFP_KERNEL | __GFP_NORETRY, 0);
 	if (!page)
 		return NULL;