linux-sg2042/arch/ppc/kernel
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
..
Makefile [POWERPC] 8xx: generic 8xx code arch/powerpc port 2007-02-07 14:01:02 +11:00
asm-offsets.c rename thread_info to stack 2007-05-09 12:30:56 -07:00
cpu_setup_power4.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
entry.S [PPC] Fix COMMON symbol warnings 2007-05-23 00:17:44 -05:00
head.S [POWERPC] Remove the broken Gemini support 2007-01-24 21:13:58 +11:00
head_4xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_8xx.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_44x.S Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
head_booke.h [PATCH] ppc32: fix ppc44x fpu build 2005-11-10 11:24:06 +11:00
head_fsl_booke.S [POWERPC] 85xx: Drop use of SYNC macro in head_fsl_booke.S 2007-02-13 16:13:27 -06:00
machine_kexec.c Storage class should be first 2006-06-26 18:57:34 +02:00
misc.S [POWERPC] Merge CPU features pertaining to icache coherency 2007-06-14 22:30:16 +10:00
pci.c PCI: Use a weak symbol for the empty version of pcibios_add_platform_entries() 2007-07-11 16:02:07 -07:00
ppc-stub.c Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
ppc_htab.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
ppc_ksyms.c [POWERPC] Remove unused do_signal export 2007-07-10 21:53:36 +10:00
relocate_kernel.S [PATCH] ppc32: use correct register names in arch/ppc/kernel/relocate_kernel.S 2005-06-30 08:45:09 -07:00
rio.c [PATCH] RapidIO support: ppc32 2005-11-07 07:53:47 -08:00
semaphore.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
setup.c [POWERPC] Merge CPU features pertaining to icache coherency 2007-06-14 22:30:16 +10:00
smp-tbsync.c [POWERPC] Fix irq enable/disable in smp_generic_take_timebase 2006-08-30 16:10:47 +10:00
smp.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
softemu8xx.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
time.c [POWERPC] ppc: Add missing calls to set_irq_regs 2006-10-16 15:52:14 +10:00
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