The patch titled
s390: add read_mostly optimization
has been removed from the -mm tree. Its filename is
s390-add-read_mostly-optimization.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
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
--- devel/arch/s390/kernel/vmlinux.lds.S~s390-add-read_mostly-optimization 2006-04-27 18:39:06.000000000 -0700
+++ devel-akpm/arch/s390/kernel/vmlinux.lds.S 2006-04-27 18:39:06.000000000 -0700
@@ -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
--- devel/include/asm-s390/cache.h~s390-add-read_mostly-optimization 2006-04-27 18:39:06.000000000 -0700
+++ devel-akpm/include/asm-s390/cache.h 2006-04-27 18:39:06.000000000 -0700
@@ -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
origin.patch
-
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