linux/arch/s390
Heiko Carstens 4bffbb3455 s390/mm: have 16 byte aligned struct pages
Select HAVE_ALIGNED_STRUCT_PAGE on s390, so that the slub allocator can make
use of compare and swap double for lockless updates. This increases the size
of struct page to 64 bytes (instead of 56 bytes), however the performance gain
justifies the increased size:

- now excactly four struct pages fit into a single cache line; the
  case that accessing a struct page causes two cache line loads
  does not exist anymore.
- calculating the offset of a struct page within the memmap array
  is only a simple shift instead of a more expensive multiplication.

A "hackbench 200 process 200" run on a 32 cpu system did show an 8% runtime
improvement.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2012-11-13 11:03:09 +01:00
..
appldata s390/vtimer: rework virtual timer interface 2012-07-20 11:15:08 +02:00
boot s390: fix linker script for 31 bit builds 2012-10-18 17:50:10 +02:00
crypto crypto: arch/s390 - cleanup - remove unneeded cra_list initialization 2012-08-01 17:47:29 +08:00
hypfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-10-02 20:25:04 -07:00
include s390/topology: fix core id vs physical package id mix-up 2012-11-12 16:24:38 +01:00
kernel s390/topology: fix core id vs physical package id mix-up 2012-11-12 16:24:38 +01:00
kvm KVM updates for the 3.7 merge window 2012-10-04 09:30:33 -07:00
lib s390/mm: use pmd_large() instead of pmd_huge() 2012-10-26 16:44:23 +02:00
math-emu s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
mm s390/gup: fix access_ok() usage in __get_user_pages_fast() 2012-11-13 11:02:28 +01:00
net s390/bpf,jit: add support for BPF_S_ANC_ALU_XOR_X instruction 2012-09-26 15:45:28 +02:00
oprofile oprofile, s390: Fix uninitialized memory access when writing to oprofilefs 2012-08-27 14:49:23 +02:00
defconfig s390: update defconfig 2012-09-26 15:45:29 +02:00
Kbuild s390/bpf,jit: BPF Just In Time compiler for s390 2012-09-26 15:44:49 +02:00
Kconfig s390/mm: have 16 byte aligned struct pages 2012-11-13 11:03:09 +01:00
Kconfig.debug s390/mm: add page table dumper 2012-10-09 14:16:58 +02:00
Makefile s390: Use generic init_task 2012-05-05 13:00:25 +02:00