i386, x86_64 and sparc64 support the __read_mostly attribute to place
frequently read variables separately from variables that may be frequently
written to thereby optimizing cacheline use and avoiding false aliasing.
This patch implements __read_mostly for IA64.
Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]>
Index: linux-2.6.13-rc2/arch/ia64/kernel/vmlinux.lds.S
===================================================================
--- linux-2.6.13-rc2.orig/arch/ia64/kernel/vmlinux.lds.S 2005-07-05
20:46:33.000000000 -0700
+++ linux-2.6.13-rc2/arch/ia64/kernel/vmlinux.lds.S 2005-07-12
16:13:47.000000000 -0700
@@ -179,6 +179,9 @@ SECTIONS
.data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET)
{ *(.data.cacheline_aligned) }
+ .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET)
+ { *(.data.read_mostly) }
+
/* Per-cpu data: */
percpu : { } :percpu
. = ALIGN(PERCPU_PAGE_SIZE);
Index: linux-2.6.13-rc2/include/linux/cache.h
===================================================================
--- linux-2.6.13-rc2.orig/include/linux/cache.h 2005-07-12 16:18:41.000000000
-0700
+++ linux-2.6.13-rc2/include/linux/cache.h 2005-07-12 16:19:00.000000000
-0700
@@ -13,7 +13,7 @@
#define SMP_CACHE_BYTES L1_CACHE_BYTES
#endif
-#if defined(CONFIG_X86) || defined(CONFIG_SPARC64)
+#if defined(CONFIG_X86) || defined(CONFIG_SPARC64) || defined(CONFIG_IA64)
#define __read_mostly __attribute__((__section__(".data.read_mostly")))
#else
#define __read_mostly
-
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