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| author |   Sergei Rogachev <rogachevsergei@gmail.com> | 2015-02-11 15:28:34 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-11 17:06:07 -0800 |
| commit | 94f759d62b2c6a9d124b0622077b1ddcfac43fb5 (patch) | |
| tree | 962eb704c95c064dbfcdd59b4033f490c4ede34a /include/linux/page_ext.h | |
| parent | Documentation/filesystems/proc.txt: describe /proc/<pid>/map_files (diff) | |
| download | linux-dev-94f759d62b2c6a9d124b0622077b1ddcfac43fb5.tar.xz linux-dev-94f759d62b2c6a9d124b0622077b1ddcfac43fb5.zip | |
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/linux/page_ext.h')
| -rw-r--r-- | include/linux/page_ext.h | 2 |
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 }; |