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authorFenghua Yu <fenghua.yu@intel.com>2007-07-19 04:48:12 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 13:04:44 -0400
commit5fb7dc37dc16fbc8b80d81318a582201ef7e280d (patch)
tree4d6bb4441ece64380e7186ebadd35ad2f5486f9f /arch/ppc/kernel/vmlinux.lds.S
parent3d7e33825d8799115dd2495c9944badd3272a623 (diff)
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>
Diffstat (limited to 'arch/ppc/kernel/vmlinux.lds.S')
-rw-r--r--arch/ppc/kernel/vmlinux.lds.S5
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/ppc/kernel/vmlinux.lds.S b/arch/ppc/kernel/vmlinux.lds.S
index 19db8746ff14..c0aac3ff9e91 100644
--- a/arch/ppc/kernel/vmlinux.lds.S
+++ b/arch/ppc/kernel/vmlinux.lds.S
@@ -130,10 +130,7 @@ SECTIONS
130 __ftr_fixup : { *(__ftr_fixup) } 130 __ftr_fixup : { *(__ftr_fixup) }
131 __stop___ftr_fixup = .; 131 __stop___ftr_fixup = .;
132 132
133 . = ALIGN(4096); 133 PERCPU(4096)
134 __per_cpu_start = .;
135 .data.percpu : { *(.data.percpu) }
136 __per_cpu_end = .;
137 134
138#ifdef CONFIG_BLK_DEV_INITRD 135#ifdef CONFIG_BLK_DEV_INITRD
139 . = ALIGN(4096); 136 . = ALIGN(4096);