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authorSergei Rogachev <rogachevsergei@gmail.com>2015-02-11 15:28:34 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 17:06:07 -0800
commit94f759d62b2c6a9d124b0622077b1ddcfac43fb5 (patch)
tree962eb704c95c064dbfcdd59b4033f490c4ede34a /include
parent740a5ddb0e0d2ef3bd0a80ae027bf9d211b8c82d (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/page_ext.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h
index d2a2c84c72d0..c42981cd99aa 100644
--- a/include/linux/page_ext.h
+++ b/include/linux/page_ext.h
@@ -40,7 +40,7 @@ struct page_ext {
#ifdef CONFIG_PAGE_OWNER
unsigned int order;
gfp_t gfp_mask;
- struct stack_trace trace;
+ unsigned int nr_entries;
unsigned long trace_entries[8];
#endif
};