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[PATCH] s390: add read_mostly optimization

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Add a read_mostly section and define __read_mostly to prevent cache line
pollution due to writes for mostly read variables.  In addition fix the
incorrect alignment of the cache_line_aligned data section.  s390 has a
cacheline size of 256 bytes.

Signed-off-by: Christian Borntraeger <cborntra@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christian Borntraeger 2006-04-27 18:40:24 -07:00 committed by Linus Torvalds
parent b73d40c617
commit 58268b97f6
2 changed files with 5 additions and 1 deletions
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4
arch/s390/kernel/vmlinux.lds.S
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@ -58,9 +58,11 @@ SECTIONS
. = ALIGN(4096);
.data.page_aligned : { *(.data.idt) }
. = ALIGN(32);
. = ALIGN(256);
.data.cacheline_aligned : { *(.data.cacheline_aligned) }
. = ALIGN(256);
.data.read_mostly : { *(.data.read_mostly) }
_edata = .; /* End of data section */
. = ALIGN(8192); /* init_task */

2
include/asm-s390/cache.h
View file

@ -16,4 +16,6 @@
#define ARCH_KMALLOC_MINALIGN 8
#define __read_mostly __attribute__((__section__(".data.read_mostly")))
#endif