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ARM: implement support for read-mostly sections

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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>
This commit is contained in:
Russell King
2010-12-04 17:08:32 +00:00
parent 0b05da7200
commit daf8741675
2 changed files with 3 additions and 0 deletions
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2
arch/arm/include/asm/cache.h
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@@ -23,4 +23,6 @@
#define ARCH_SLAB_MINALIGN 8 #define ARCH_SLAB_MINALIGN 8
#endif #endif
#define __read_mostly __attribute__((__section__(".data..read_mostly")))
#endif #endif

1
arch/arm/kernel/vmlinux.lds.S
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@@ -167,6 +167,7 @@ SECTIONS
NOSAVE_DATA NOSAVE_DATA
CACHELINE_ALIGNED_DATA(32) CACHELINE_ALIGNED_DATA(32)
READ_MOSTLY_DATA(32)
/* /*
* The exception fixup table (might need resorting at runtime) * The exception fixup table (might need resorting at runtime)