diff options
| author | Richard Kennedy <richard@rsk.demon.co.uk> | 2011-05-24 14:49:59 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-05-25 16:16:41 +0200 |
| commit | af6a25f0e1ec0265c267e6ee4513925eaba6d0ed (patch) | |
| tree | 00b34efeb9fe46264bd6297134c733c61bfe047d /lib/timerqueue.c | |
| parent | f073cc8f39b48fdf4c8cd9520a6028fe69199b60 (diff) | |
x86: Reorder mm_context_t to remove x86_64 alignment padding and thus shrink mm_struct
Reorder mm_context_t to remove alignment padding on 64 bit
builds shrinking its size from 64 to 56 bytes.
This allows mm_struct to shrink from 840 to 832 bytes, so using
one fewer cache lines, and getting more objects per slab when
using slub.
slabinfo mm_struct reports
before :-
Sizes (bytes) Slabs
-----------------------------------
Object : 840 Total : 7
SlabObj: 896 Full : 1
SlabSiz: 16384 Partial: 4
Loss : 56 CpuSlab: 2
Align : 64 Objects: 18
after :-
Sizes (bytes) Slabs
----------------------------------
Object : 832 Total : 7
SlabObj: 832 Full : 1
SlabSiz: 16384 Partial: 4
Loss : 0 CpuSlab: 2
Align : 64 Objects: 19
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: wilsons@start.ca
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Link: http://lkml.kernel.org/r/1306244999.1999.5.camel@castor.rsk
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/timerqueue.c')
0 files changed, 0 insertions, 0 deletions