On 5 December 2010 11:43, Russell King - ARM Linux <li...@arm.linux.org.uk> wrote: > 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+ker...@arm.linux.org.uk> > --- > arch/arm/include/asm/cache.h | 2 ++ > 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)
Should we change the alignments to 64? -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html