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Fenghua Yu 5fb7dc37dc define new percpu interface for shared data 
per cpu data section contains two types of data.  One set which is
exclusively accessed by the local cpu and the other set which is per cpu,
but also shared by remote cpus.  In the current kernel, these two sets are
not clearely separated out.  This can potentially cause the same data
cacheline shared between the two sets of data, which will result in
unnecessary bouncing of the cacheline between cpus.

One way to fix the problem is to cacheline align the remotely accessed per
cpu data, both at the beginning and at the end.  Because of the padding at
both ends, this will likely cause some memory wastage and also the
interface to achieve this is not clean.

This patch:

Moves the remotely accessed per cpu data (which is currently marked
as ____cacheline_aligned_in_smp) into a different section, where all the data
elements are cacheline aligned. And as such, this differentiates the local
only data and remotely accessed data cleanly.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: <linux-arch@vger.kernel.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 10:04:44 -07:00
..
alpha_ksyms.c [PATCH] fixing includes in alpha_ksyms.c 2006-10-12 12:25:27 -07:00
asm-offsets.c [PATCH] alpha: Fix getxpid on alpha so it works for threads 2006-02-01 08:53:21 -08:00
console.c ALPHA: support graphics on non-zero PCI domains 2007-06-01 08:18:29 -07:00
core_apecs.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
core_cia.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
core_irongate.c [PATCH] alpha_ksyms.c cleanup 2006-10-11 11:17:07 -07:00
core_lca.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
core_marvel.c ALPHA: support graphics on non-zero PCI domains 2007-06-01 08:18:29 -07:00
core_mcpcia.c alpha: fixes for specific machine types 2007-04-17 16:36:27 -07:00
core_polaris.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
core_t2.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
core_titan.c ALPHA: support graphics on non-zero PCI domains 2007-06-01 08:18:29 -07:00
core_tsunami.c ALPHA: support graphics on non-zero PCI domains 2007-06-01 08:18:29 -07:00
core_wildfire.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
entry.S alpha: support new syscalls 2007-05-30 10:07:54 -07:00
err_common.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
err_ev6.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
err_ev7.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
err_impl.h [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
err_marvel.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
err_titan.c alpha: fixes for specific machine types 2007-04-17 16:36:27 -07:00
es1888.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
gct.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head.S fix file specification in comments 2006-10-03 23:01:26 +02:00
init_task.c [PATCH] nsproxy: move init_nsproxy into kernel/nsproxy.c 2006-10-02 07:57:20 -07:00
io.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
irq.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
irq_alpha.c [PATCH] alpha_ksyms.c cleanup 2006-10-11 11:17:07 -07:00
irq_i8259.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
irq_impl.h [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
irq_pyxis.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
irq_srm.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
machvec_impl.h fix file specification in comments 2006-10-03 23:01:26 +02:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
module.c alpha: fixes for specific machine types 2007-04-17 16:36:27 -07:00
ns87312.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
osf_sys.c utimensat implementation 2007-05-08 11:15:18 -07:00
pci-noop.c [PATCH] alpha_ksyms.c cleanup 2006-10-11 11:17:07 -07:00
pci.c PCI: make isa_bridge Alpha-only 2007-02-07 15:50:06 -08:00
pci_impl.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
pci_iommu.c PCI: remove pci_dac_dma_... APIs 2007-07-11 16:02:11 -07:00
process.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
proto.h ALPHA: support graphics on non-zero PCI domains 2007-06-01 08:18:29 -07:00
ptrace.c PTRACE_POKEDATA consolidation 2007-07-17 10:23:03 -07:00
semaphore.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
setup.c alpha: cleanup in bitops.h 2007-05-30 10:07:54 -07:00
signal.c alpha: support new syscalls 2007-05-30 10:07:54 -07:00
smc37c93x.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
smc37c669.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
smp.c alpha __init fixes 2007-07-17 11:01:07 -07:00
srm_env.c Update for the srm_env driver. 2006-11-07 23:50:37 +01:00
srmcons.c alpha: fix trivial section mismatch warnings 2007-07-16 09:05:37 -07:00
sys_alcor.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
sys_cabriolet.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
sys_dp264.c ALPHA: support graphics on non-zero PCI domains 2007-06-01 08:18:29 -07:00
sys_eb64p.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
sys_eiger.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
sys_jensen.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
sys_marvel.c alpha: fix trivial section mismatch warnings 2007-07-16 09:05:37 -07:00
sys_miata.c [PATCH] alpha: switch to pci_get API 2006-12-07 08:39:26 -08:00
sys_mikasa.c [PATCH] alpha pt_regs cleanups: machine_check() 2006-10-08 12:32:36 -07:00
sys_nautilus.c alpha: more fixes for specific machine types 2007-04-17 16:36:27 -07:00
sys_noritake.c alpha: fixes for specific machine types 2007-04-17 16:36:27 -07:00
sys_rawhide.c alpha: fixes for specific machine types 2007-04-17 16:36:27 -07:00
sys_ruffian.c [PATCH] arch/alpha: Use ARRAY_SIZE macro 2006-07-31 13:28:38 -07:00
sys_rx164.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
sys_sable.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
sys_sio.c alpha: fixes for specific machine types 2007-04-17 16:36:27 -07:00
sys_sx164.c alpha: more fixes for specific machine types 2007-04-17 16:36:27 -07:00
sys_takara.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
sys_titan.c ALPHA: support graphics on non-zero PCI domains 2007-06-01 08:18:29 -07:00
sys_wildfire.c [PATCH] alpha pt_regs cleanups: handle_irq() 2006-10-08 12:32:35 -07:00
systbls.S alpha: support new syscalls 2007-05-30 10:07:54 -07:00
time.c alpha: fix trivial section mismatch warnings 2007-07-16 09:05:37 -07:00
traps.c Report that kernel is tainted if there was an OOPS 2007-07-17 10:23:02 -07:00
vmlinux.lds.S define new percpu interface for shared data 2007-07-19 10:04:44 -07:00