The patch titled
Subject: mm/page_owner.c: reduce page_owner structure size
has been added to the -mm tree. Its filename is
mm-reducing-page_owner-structure-size.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-reducing-page_owner-structure-size.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-reducing-page_owner-structure-size.patch
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------------------------------------------------------
From: Ayush Mittal <ayush.m@xxxxxxxxxxx>
Subject: mm/page_owner.c: reduce page_owner structure size
Maximum page order can be at max 10 which can be accomodated in short data
type(2 bytes). last_migrate_reason is defined as enum type whose values
can be accomodated in short data type (2 bytes).
Total structure size is currently 16 bytes but after changing structure
size it goes to 12 bytes.
Vlastimil said:
: Looks like it works, so why not.
: Before:
: [ 0.001000] allocated 50331648 bytes of page_ext
: After:
: [ 0.001000] allocated 41943040 bytes of page_ext
Link: http://lkml.kernel.org/r/1507623917-37991-1-git-send-email-ayush.m@xxxxxxxxxxx
Signed-off-by: Ayush Mittal <ayush.m@xxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Cc: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
Cc: Vaneet Narang <v.narang@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_owner.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN mm/page_owner.c~mm-reducing-page_owner-structure-size mm/page_owner.c
--- a/mm/page_owner.c~mm-reducing-page_owner-structure-size
+++ a/mm/page_owner.c
@@ -19,9 +19,9 @@
#define PAGE_OWNER_STACK_DEPTH (16)
struct page_owner {
- unsigned int order;
+ unsigned short order;
+ short last_migrate_reason;
gfp_t gfp_mask;
- int last_migrate_reason;
depot_stack_handle_t handle;
};
_
Patches currently in -mm which might be from ayush.m@xxxxxxxxxxx are
mm-reducing-page_owner-structure-size.patch
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