Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765522AbXEVSXX (ORCPT ); Tue, 22 May 2007 14:23:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756844AbXEVSXP (ORCPT ); Tue, 22 May 2007 14:23:15 -0400 Received: from mga03.intel.com ([143.182.124.21]:12477 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756617AbXEVSXO (ORCPT ); Tue, 22 May 2007 14:23:14 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.14,567,1170662400"; d="scan'208";a="230913079" Date: Tue, 22 May 2007 11:20:03 -0700 From: Fenghua Yu To: akpm@linux-foundation.org, suresh.b.siddha@intel.com, clameter@sgi.com, kiran@scalex86.org, rmk@arm.linux.org.uk, linux-kernel@vger.kernel.org Cc: fenghua.yu@intel.com Subject: [PATCH 1/2] Define new percpu interface for shared data -- version 3 Message-ID: <20070522182003.GA28106@linux-os.sc.intel.com> References: <20070522124713.GB27428@frankl.hpl.hp.com> <20070522090210.1388ff3e.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070522090210.1388ff3e.akpm@linux-foundation.org> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 21173 Lines: 500 Changes from previous version: Fix a compilation error for ARM 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. igned-off-by: Fenghua Yu Acked-by: Suresh Siddha --- arch/alpha/kernel/vmlinux.lds.S | 5 +---- arch/arm/kernel/vmlinux.lds.S | 1 + arch/cris/arch-v32/vmlinux.lds.S | 5 +---- arch/frv/kernel/vmlinux.lds.S | 5 +---- arch/i386/kernel/vmlinux.lds.S | 7 +------ arch/ia64/kernel/vmlinux.lds.S | 1 + arch/m32r/kernel/vmlinux.lds.S | 5 +---- arch/mips/kernel/vmlinux.lds.S | 5 +---- arch/parisc/kernel/vmlinux.lds.S | 7 +++---- arch/powerpc/kernel/vmlinux.lds.S | 7 +------ arch/ppc/kernel/vmlinux.lds.S | 5 +---- arch/s390/kernel/vmlinux.lds.S | 5 +---- arch/sh/kernel/vmlinux.lds.S | 5 +---- arch/sh64/kernel/vmlinux.lds.S | 5 +---- arch/sparc/kernel/vmlinux.lds.S | 5 +---- arch/sparc64/kernel/vmlinux.lds.S | 5 +---- arch/x86_64/kernel/vmlinux.lds.S | 6 ++---- arch/xtensa/kernel/vmlinux.lds.S | 5 +---- include/asm-generic/percpu.h | 8 ++++++++ include/asm-generic/vmlinux.lds.h | 8 ++++++++ include/asm-i386/percpu.h | 5 +++++ include/asm-ia64/percpu.h | 10 ++++++++++ include/asm-powerpc/percpu.h | 7 +++++++ include/asm-s390/percpu.h | 7 +++++++ include/asm-sparc64/percpu.h | 7 +++++++ include/asm-x86_64/percpu.h | 7 +++++++ 26 files changed, 80 insertions(+), 68 deletions(-) diff -Nurp linux-2.6.22-rc1-mm1.0/arch/alpha/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/alpha/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/alpha/kernel/vmlinux.lds.S 2007-05-18 15:37:15.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/alpha/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -69,10 +69,7 @@ SECTIONS . = ALIGN(8); SECURITY_INIT - . = ALIGN(8192); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(8192) . = ALIGN(2*8192); __init_end = .; diff -Nurp linux-2.6.22-rc1-mm1.0/arch/arm/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/arm/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/arm/kernel/vmlinux.lds.S 2007-05-18 15:37:15.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/arm/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -66,6 +66,7 @@ SECTIONS . = ALIGN(4096); __per_cpu_start = .; *(.data.percpu) + *(.data.percpu.shared_aligned) __per_cpu_end = .; #ifndef CONFIG_XIP_KERNEL __init_begin = _stext; diff -Nurp linux-2.6.22-rc1-mm1.0/arch/cris/arch-v32/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/cris/arch-v32/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/cris/arch-v32/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/cris/arch-v32/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -91,10 +91,7 @@ SECTIONS } SECURITY_INIT - . = ALIGN (8192); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(8192) #ifdef CONFIG_BLK_DEV_INITRD .init.ramfs : { diff -Nurp linux-2.6.22-rc1-mm1.0/arch/frv/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/frv/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/frv/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/frv/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -57,10 +57,7 @@ SECTIONS __alt_instructions_end = .; .altinstr_replacement : { *(.altinstr_replacement) } - . = ALIGN(4096); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(4096) #ifdef CONFIG_BLK_DEV_INITRD . = ALIGN(4096); diff -Nurp linux-2.6.22-rc1-mm1.0/arch/i386/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/i386/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/i386/kernel/vmlinux.lds.S 2007-05-18 15:38:09.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/i386/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -178,12 +178,7 @@ SECTIONS __initramfs_end = .; } #endif - . = ALIGN(4096); - .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { - __per_cpu_start = .; - *(.data.percpu) - __per_cpu_end = .; - } + PERCPU(4096) . = ALIGN(4096); /* freed after init ends here */ diff -Nurp linux-2.6.22-rc1-mm1.0/arch/ia64/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/ia64/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/ia64/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/ia64/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -206,6 +206,7 @@ SECTIONS { __per_cpu_start = .; *(.data.percpu) + *(.data.percpu.shared_aligned) __per_cpu_end = .; } . = __phys_per_cpu_start + PERCPU_PAGE_SIZE; /* ensure percpu data fits diff -Nurp linux-2.6.22-rc1-mm1.0/arch/m32r/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/m32r/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/m32r/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/m32r/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -110,10 +110,7 @@ SECTIONS __initramfs_end = .; #endif - . = ALIGN(4096); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(4096) . = ALIGN(4096); __init_end = .; /* freed after init ends here */ diff -Nurp linux-2.6.22-rc1-mm1.0/arch/mips/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/mips/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/mips/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/mips/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -119,10 +119,7 @@ SECTIONS .init.ramfs : { *(.init.ramfs) } __initramfs_end = .; #endif - . = ALIGN(_PAGE_SIZE); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(_PAGE_SIZE) . = ALIGN(_PAGE_SIZE); __init_end = .; /* freed after init ends here */ diff -Nurp linux-2.6.22-rc1-mm1.0/arch/parisc/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/parisc/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/parisc/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/parisc/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -181,10 +181,9 @@ SECTIONS .init.ramfs : { *(.init.ramfs) } __initramfs_end = .; #endif - . = ALIGN(ASM_PAGE_SIZE); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + + PERCPU(ASM_PAGE_SIZE) + . = ALIGN(ASM_PAGE_SIZE); __init_end = .; /* freed after init ends here */ diff -Nurp linux-2.6.22-rc1-mm1.0/arch/powerpc/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/powerpc/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/powerpc/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/powerpc/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -139,12 +139,7 @@ SECTIONS __initramfs_end = .; } #endif - . = ALIGN(PAGE_SIZE); - .data.percpu : { - __per_cpu_start = .; - *(.data.percpu) - __per_cpu_end = .; - } + PERCPU(PAGE_SIZE) . = ALIGN(8); .machine.desc : { diff -Nurp linux-2.6.22-rc1-mm1.0/arch/ppc/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/ppc/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/ppc/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/ppc/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -130,10 +130,7 @@ SECTIONS __ftr_fixup : { *(__ftr_fixup) } __stop___ftr_fixup = .; - . = ALIGN(4096); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(4096) #ifdef CONFIG_BLK_DEV_INITRD . = ALIGN(4096); diff -Nurp linux-2.6.22-rc1-mm1.0/arch/s390/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/s390/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/s390/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/s390/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -107,10 +107,7 @@ SECTIONS . = ALIGN(2); __initramfs_end = .; #endif - . = ALIGN(4096); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(4096) . = ALIGN(4096); __init_end = .; /* freed after init ends here */ diff -Nurp linux-2.6.22-rc1-mm1.0/arch/sh/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/sh/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/sh/kernel/vmlinux.lds.S 2007-05-18 15:38:09.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/sh/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -60,10 +60,7 @@ SECTIONS . = ALIGN(PAGE_SIZE); __nosave_end = .; - . = ALIGN(PAGE_SIZE); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(PAGE_SIZE) .data.cacheline_aligned : { *(.data.cacheline_aligned) } _edata = .; /* End of data section */ diff -Nurp linux-2.6.22-rc1-mm1.0/arch/sh64/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/sh64/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/sh64/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/sh64/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -85,10 +85,7 @@ SECTIONS . = ALIGN(PAGE_SIZE); .data.page_aligned : C_PHYS(.data.page_aligned) { *(.data.page_aligned) } - . = ALIGN(PAGE_SIZE); - __per_cpu_start = .; - .data.percpu : C_PHYS(.data.percpu) { *(.data.percpu) } - __per_cpu_end = . ; + PERCPU(PAGE_SIZE) .data.cacheline_aligned : C_PHYS(.data.cacheline_aligned) { *(.data.cacheline_aligned) } _edata = .; /* End of data section */ diff -Nurp linux-2.6.22-rc1-mm1.0/arch/sparc/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/sparc/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/sparc/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/sparc/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -65,10 +65,7 @@ SECTIONS __initramfs_end = .; #endif - . = ALIGN(4096); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(4096) . = ALIGN(4096); __init_end = .; . = ALIGN(32); diff -Nurp linux-2.6.22-rc1-mm1.0/arch/sparc64/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/sparc64/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/sparc64/kernel/vmlinux.lds.S 2007-04-25 20:08:32.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/sparc64/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -89,10 +89,7 @@ SECTIONS __initramfs_end = .; #endif - . = ALIGN(8192); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(8192) . = ALIGN(8192); __init_end = .; __bss_start = .; diff -Nurp linux-2.6.22-rc1-mm1.0/arch/x86_64/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/x86_64/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/x86_64/kernel/vmlinux.lds.S 2007-05-18 15:38:09.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/x86_64/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -203,10 +203,8 @@ SECTIONS __initramfs_end = .; #endif - . = ALIGN(4096); - __per_cpu_start = .; - .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(4096) + . = ALIGN(4096); __init_end = .; diff -Nurp linux-2.6.22-rc1-mm1.0/arch/xtensa/kernel/vmlinux.lds.S linux-2.6.22-rc1-mm1.1/arch/xtensa/kernel/vmlinux.lds.S --- linux-2.6.22-rc1-mm1.0/arch/xtensa/kernel/vmlinux.lds.S 2007-05-18 15:37:16.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/arch/xtensa/kernel/vmlinux.lds.S 2007-05-18 15:40:08.000000000 -0700 @@ -198,10 +198,7 @@ SECTIONS __ftr_fixup : { *(__ftr_fixup) } __stop___ftr_fixup = .; - . = ALIGN(4096); - __per_cpu_start = .; - .data.percpu : { *(.data.percpu) } - __per_cpu_end = .; + PERCPU(4096) #ifdef CONFIG_BLK_DEV_INITRD . = ALIGN(4096); diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-generic/percpu.h linux-2.6.22-rc1-mm1.1/include/asm-generic/percpu.h --- linux-2.6.22-rc1-mm1.0/include/asm-generic/percpu.h 2007-05-18 15:37:19.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-generic/percpu.h 2007-05-18 15:40:08.000000000 -0700 @@ -14,6 +14,11 @@ extern unsigned long __per_cpu_offset[NR #define DEFINE_PER_CPU(type, name) \ __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __typeof__(type) per_cpu__##name \ + ____cacheline_aligned_in_smp + /* var is in discarded region: offset to particular copy we want */ #define per_cpu(var, cpu) (*({ \ extern int simple_identifier_##var(void); \ @@ -34,6 +39,9 @@ do { \ #define DEFINE_PER_CPU(type, name) \ __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + DEFINE_PER_CPU(type, name) + #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) #define __get_cpu_var(var) per_cpu__##var #define __raw_get_cpu_var(var) per_cpu__##var diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-generic/vmlinux.lds.h linux-2.6.22-rc1-mm1.1/include/asm-generic/vmlinux.lds.h --- linux-2.6.22-rc1-mm1.0/include/asm-generic/vmlinux.lds.h 2007-05-18 15:38:10.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-generic/vmlinux.lds.h 2007-05-18 15:41:53.000000000 -0700 @@ -251,3 +251,11 @@ *(.initcall7.init) \ *(.initcall7s.init) +#define PERCPU(align) \ + . = ALIGN(align); \ + __per_cpu_start = .; \ + .data.percpu : AT(ADDR(.data.percpu) - LOAD_OFFSET) { \ + *(.data.percpu) \ + *(.data.percpu.shared_aligned) \ + } \ + __per_cpu_end = .; diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-i386/percpu.h linux-2.6.22-rc1-mm1.1/include/asm-i386/percpu.h --- linux-2.6.22-rc1-mm1.0/include/asm-i386/percpu.h 2007-05-18 15:37:19.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-i386/percpu.h 2007-05-18 15:40:08.000000000 -0700 @@ -54,6 +54,11 @@ extern unsigned long __per_cpu_offset[]; #define DEFINE_PER_CPU(type, name) \ __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __typeof__(type) per_cpu__##name \ + ____cacheline_aligned_in_smp + /* We can use this directly for local CPU (faster). */ DECLARE_PER_CPU(unsigned long, this_cpu_off); diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-ia64/percpu.h linux-2.6.22-rc1-mm1.1/include/asm-ia64/percpu.h --- linux-2.6.22-rc1-mm1.0/include/asm-ia64/percpu.h 2007-04-25 20:08:32.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-ia64/percpu.h 2007-05-18 15:40:08.000000000 -0700 @@ -29,6 +29,16 @@ __attribute__((__section__(".data.percpu"))) \ __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name +#ifdef CONFIG_SMP +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name \ + ____cacheline_aligned_in_smp +#else +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + DEFINE_PER_CPU(type, name) +#endif + /* * Pretty much a literal copy of asm-generic/percpu.h, except that percpu_modcopy() is an * external routine, to avoid include-hell. diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-powerpc/percpu.h linux-2.6.22-rc1-mm1.1/include/asm-powerpc/percpu.h --- linux-2.6.22-rc1-mm1.0/include/asm-powerpc/percpu.h 2007-04-25 20:08:32.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-powerpc/percpu.h 2007-05-18 15:40:08.000000000 -0700 @@ -20,6 +20,11 @@ #define DEFINE_PER_CPU(type, name) \ __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __typeof__(type) per_cpu__##name \ + ____cacheline_aligned_in_smp + /* var is in discarded region: offset to particular copy we want */ #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu))) #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset())) @@ -40,6 +45,8 @@ extern void setup_per_cpu_areas(void); #define DEFINE_PER_CPU(type, name) \ __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + DEFINE_PER_CPU(type, name) #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) #define __get_cpu_var(var) per_cpu__##var diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-s390/percpu.h linux-2.6.22-rc1-mm1.1/include/asm-s390/percpu.h --- linux-2.6.22-rc1-mm1.0/include/asm-s390/percpu.h 2007-04-25 20:08:32.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-s390/percpu.h 2007-05-18 15:40:08.000000000 -0700 @@ -41,6 +41,11 @@ extern unsigned long __per_cpu_offset[NR __attribute__((__section__(".data.percpu"))) \ __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __typeof__(type) per_cpu__##name \ + ____cacheline_aligned_in_smp + #define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset) #define __raw_get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset) #define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu]) @@ -59,6 +64,8 @@ do { \ #define DEFINE_PER_CPU(type, name) \ __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + DEFINE_PER_CPU(type, name) #define __get_cpu_var(var) __reloc_hide(var,0) #define __raw_get_cpu_var(var) __reloc_hide(var,0) diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-sparc64/percpu.h linux-2.6.22-rc1-mm1.1/include/asm-sparc64/percpu.h --- linux-2.6.22-rc1-mm1.0/include/asm-sparc64/percpu.h 2007-05-18 15:37:25.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-sparc64/percpu.h 2007-05-18 15:40:08.000000000 -0700 @@ -17,6 +17,11 @@ extern unsigned long __per_cpu_shift; #define DEFINE_PER_CPU(type, name) \ __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __typeof__(type) per_cpu__##name \ + ____cacheline_aligned_in_smp + register unsigned long __local_per_cpu_offset asm("g5"); /* var is in discarded region: offset to particular copy we want */ @@ -36,6 +41,8 @@ do { \ #define DEFINE_PER_CPU(type, name) \ __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + DEFINE_PER_CPU(type, name) #define per_cpu(var, cpu) (*((void)cpu, &per_cpu__##var)) #define __get_cpu_var(var) per_cpu__##var diff -Nurp linux-2.6.22-rc1-mm1.0/include/asm-x86_64/percpu.h linux-2.6.22-rc1-mm1.1/include/asm-x86_64/percpu.h --- linux-2.6.22-rc1-mm1.0/include/asm-x86_64/percpu.h 2007-05-18 15:37:25.000000000 -0700 +++ linux-2.6.22-rc1-mm1.1/include/asm-x86_64/percpu.h 2007-05-18 15:40:08.000000000 -0700 @@ -20,6 +20,11 @@ #define DEFINE_PER_CPU(type, name) \ __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + __attribute__((__section__(".data.percpu.shared_aligned"))) \ + __typeof__(type) per_cpu__##name \ + ____cacheline_internodealigned_in_smp + /* var is in discarded region: offset to particular copy we want */ #define per_cpu(var, cpu) (*({ \ extern int simple_identifier_##var(void); \ @@ -46,6 +51,8 @@ extern void setup_per_cpu_areas(void); #define DEFINE_PER_CPU(type, name) \ __typeof__(type) per_cpu__##name +#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \ + DEFINE_PER_CPU(type, name) #define per_cpu(var, cpu) (*((void)(cpu), &per_cpu__##var)) #define __get_cpu_var(var) per_cpu__##var - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/