Commit daf87416 authored Dec 04, 2010 by Russell King

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>

parent 0b05da72

arch/arm/include/asm/cache.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -23,4 +23,6 @@
		#define ARCH_SLAB_MINALIGN 8
		#endif

		#define __read_mostly __attribute__((__section__(".data..read_mostly")))

		#endif

arch/arm/kernel/vmlinux.lds.S

+1 −0

Original line number	Diff line number	Diff line
		@@ -167,6 +167,7 @@ SECTIONS

		NOSAVE_DATA
		CACHELINE_ALIGNED_DATA(32)
		READ_MOSTLY_DATA(32)

		/*
		* The exception fixup table (might need resorting at runtime)