Due to the alignment of following variables, these typically consume
more than just the single byte that 'bool' requires, and as there are
a few hundred instances, the cache pollution (not so much the waste of
memory) sums op. Put these variables into their own section, outside
of half way frequently used memory range.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
include/asm-generic/bug.h | 6 +++---
include/asm-generic/vmlinux.lds.h | 1 +
2 files changed, 4 insertions(+), 3 deletions(-)
--- 3.2-rc6/include/asm-generic/bug.h
+++ 3.2-rc6-warn-once-flag-cold/include/asm-generic/bug.h
@@ -134,7 +134,7 @@ extern void warn_slowpath_null(const cha
#endif
#define WARN_ON_ONCE(condition) ({ \
- static bool __warned; \
+ static bool __section(.data.unlikely) __warned; \
int __ret_warn_once = !!(condition); \
\
if (unlikely(__ret_warn_once)) \
@@ -144,7 +144,7 @@ extern void warn_slowpath_null(const cha
})
#define WARN_ONCE(condition, format...) ({ \
- static bool __warned; \
+ static bool __section(.data.unlikely) __warned; \
int __ret_warn_once = !!(condition); \
\
if (unlikely(__ret_warn_once)) \
@@ -154,7 +154,7 @@ extern void warn_slowpath_null(const cha
})
#define WARN_TAINT_ONCE(condition, taint, format...) ({ \
- static bool __warned; \
+ static bool __section(.data.unlikely) __warned; \
int __ret_warn_once = !!(condition); \
\
if (unlikely(__ret_warn_once)) \
--- 3.2-rc6/include/asm-generic/vmlinux.lds.h
+++ 3.2-rc6-warn-once-flag-cold/include/asm-generic/vmlinux.lds.h
@@ -167,6 +167,7 @@
CPU_KEEP(exit.data) \
MEM_KEEP(init.data) \
MEM_KEEP(exit.data) \
+ *(.data.unlikely) \
STRUCT_ALIGN(); \
*(__tracepoints) \
/* implement dynamic printk debug */ \
--
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