mm/page_owner.c: remove unnecessary stack_trace field

Page owner uses the page_ext structure to keep meta-information for every
page in the system.  The structure also contains a field of type 'struct
stack_trace', page owner uses this field during invocation of the function
save_stack_trace.  It is easy to notice that keeping a copy of this
structure for every page in the system is very inefficiently in terms of
memory.

The patch removes this unnecessary field of page_ext and forces page owner
to use a stack_trace structure allocated on the stack.

[akpm@linux-foundation.org: use struct initializers]
Signed-off-by: Sergei Rogachev <rogachevsergei@gmail.com>
Acked-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 12 deletions

diff --git a/mm/page_owner.c b/mm/page_owner.c
index 9ab4a9b5bc09..0993f5f36b01 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -59,20 +59,19 @@ void __reset_page_owner(struct page *page, unsigned int order)
 
 void __set_page_owner(struct page *page, unsigned int order, gfp_t gfp_mask)
 {
-        struct page_ext *page_ext;
-        struct stack_trace *trace;
-
-        page_ext = lookup_page_ext(page);
+        struct page_ext *page_ext = lookup_page_ext(page);
+        struct stack_trace trace = {
+                .nr_entries = 0,
+                .max_entries = ARRAY_SIZE(page_ext->trace_entries),
+                .entries = &page_ext->trace_entries[0],
+                .skip = 3,
+        };
 
-        trace = &page_ext->trace;
-        trace->nr_entries = 0;
-        trace->max_entries = ARRAY_SIZE(page_ext->trace_entries);
-        trace->entries = &page_ext->trace_entries[0];
-        trace->skip = 3;
-        save_stack_trace(&page_ext->trace);
+        save_stack_trace(&trace);
 
         page_ext->order = order;
         page_ext->gfp_mask = gfp_mask;
+        page_ext->nr_entries = trace.nr_entries;
 
         __set_bit(PAGE_EXT_OWNER, &page_ext->flags);
 }
@@ -84,6 +83,10 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
         int ret;
         int pageblock_mt, page_mt;
         char *kbuf;
+        struct stack_trace trace = {
+                .nr_entries = page_ext->nr_entries,
+                .entries = &page_ext->trace_entries[0],
+        };
 
         kbuf = kmalloc(count, GFP_KERNEL);
         if (!kbuf)
@@ -121,8 +124,7 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
         if (ret >= count)
                 goto err;
 
-        ret += snprint_stack_trace(kbuf + ret, count - ret,
-                                        &page_ext->trace, 0);
+        ret += snprint_stack_trace(kbuf + ret, count - ret, &trace, 0);
         if (ret >= count)
                 goto err;