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authorRichard Kennedy <richard@rsk.demon.co.uk>2011-03-22 16:32:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-22 17:44:03 -0700
commit481b4bb5e370aa69c1dc276bd08871ec01b41d2a (patch)
tree11a276bc58c2eb9b0a00fe751c3bf81bc3240382 /mm/truncate.c
parentcb240452bfc2ae9de7c840dd0fb3f5b33ce03c31 (diff)
mm: mm_struct: remove 16 bytes of alignment padding on 64 bit builds
Reorder mm_struct to remove 16 bytes of alignment padding on 64 bit builds. On my config this shrinks mm_struct by enough to fit in one fewer cache lines and allows more objects per slab in mm_struct kmem_cache under SLUB. slabinfo before patch :- Sizes (bytes) Slabs -------------------------------- Object : 848 Total : 9 SlabObj: 896 Full : 2 SlabSiz: 16384 Partial: 5 Loss : 48 CpuSlab: 2 Align : 64 Objects: 18 slabinfo after :- Sizes (bytes) Slabs -------------------------------- Object : 832 Total : 7 SlabObj: 832 Full : 2 SlabSiz: 16384 Partial: 3 Loss : 0 CpuSlab: 2 Align : 64 Objects: 19 Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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