btrfs: remove 64bit alignment padding to allow extent_buffer to fit into one fewer cacheline
Reorder extent_buffer to remove 8 bytes of alignment padding on 64 bit builds. This shrinks its size to 128 bytes allowing it to fit into one fewer cache lines and allows more objects per slab in its kmem_cache. slabinfo extent_buffer reports :- before:- Sizes (bytes) Slabs ---------------------------------- Object : 136 Total : 123 SlabObj: 136 Full : 121 SlabSiz: 4096 Partial: 0 Loss : 0 CpuSlab: 2 Align : 8 Objects: 30 after :- Object : 128 Total : 4 SlabObj: 128 Full : 2 SlabSiz: 4096 Partial: 0 Loss : 0 CpuSlab: 2 Align : 8 Objects: 32 Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
38e880540f
commit
9eb9104c66
|
@ -126,9 +126,9 @@ struct extent_buffer {
|
|||
unsigned long map_len;
|
||||
struct page *first_page;
|
||||
unsigned long bflags;
|
||||
atomic_t refs;
|
||||
struct list_head leak_list;
|
||||
struct rcu_head rcu_head;
|
||||
atomic_t refs;
|
||||
|
||||
/* the spinlock is used to protect most operations */
|
||||
spinlock_t lock;
|
||||
|
|
Loading…
Reference in a new issue