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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-04 17:08:32 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-05 08:39:36 +0000 |
| commit | daf8741675562197d4fb4c4e9d773f53494203a5 (patch) | |
| tree | a21505624d4c7963ae70e46f25b13f449c22cc18 /arch/arm | |
| parent | 0b05da7200dd56a5364c4d9cf5441715c1d706ed (diff) | |
| download | op-kernel-dev-daf8741675562197d4fb4c4e9d773f53494203a5.zip op-kernel-dev-daf8741675562197d4fb4c4e9d773f53494203a5.tar.gz | |
ARM: implement support for read-mostly sections
As our SMP implementation uses MESI protocols. Grouping together data
which is mostly only read together means that we avoid unnecessary
cache line bouncing when this code shares a cache line with other data.
In other words, cache lines associated with read-mostly data are
expected to spend most of their time in shared state.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/cache.h | 2 | ||||
| -rw-r--r-- | arch/arm/kernel/vmlinux.lds.S | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/include/asm/cache.h b/arch/arm/include/asm/cache.h index 9d61220..75fe66b 100644 --- a/arch/arm/include/asm/cache.h +++ b/arch/arm/include/asm/cache.h @@ -23,4 +23,6 @@ #define ARCH_SLAB_MINALIGN 8 #endif +#define __read_mostly __attribute__((__section__(".data..read_mostly"))) + #endif diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index cead889..1581f6d 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -167,6 +167,7 @@ SECTIONS NOSAVE_DATA CACHELINE_ALIGNED_DATA(32) + READ_MOSTLY_DATA(32) /* * The exception fixup table (might need resorting at runtime) |
