The patch titled
s390: add read_mostly optimization
has been added to the -mm tree. Its filename is
s390-add-read_mostly-optimization.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
From: Christian Borntraeger <cborntra@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/s390/kernel/vmlinux.lds.S | 4 +++-
include/asm-s390/cache.h | 2 ++
2 files changed, 5 insertions(+), 1 deletion(-)
diff -puN arch/s390/kernel/vmlinux.lds.S~s390-add-read_mostly-optimization arch/s390/kernel/vmlinux.lds.S
--- 25/arch/s390/kernel/vmlinux.lds.S~s390-add-read_mostly-optimization Mon Apr 24 16:46:11 2006
+++ 25-akpm/arch/s390/kernel/vmlinux.lds.S Mon Apr 24 16:46:11 2006
@@ -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 */
diff -puN include/asm-s390/cache.h~s390-add-read_mostly-optimization include/asm-s390/cache.h
--- 25/include/asm-s390/cache.h~s390-add-read_mostly-optimization Mon Apr 24 16:46:11 2006
+++ 25-akpm/include/asm-s390/cache.h Mon Apr 24 16:46:11 2006
@@ -16,4 +16,6 @@
#define ARCH_KMALLOC_MINALIGN 8
+#define __read_mostly __attribute__((__section__(".data.read_mostly")))
+
#endif
_
Patches currently in -mm which might be from cborntra@xxxxxxxxxx are
s390-fix-slab-debugging.patch
s390-add-read_mostly-optimization.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
