* [PATCH 1/2] x86: Define early read-mostly per-cpu macros
@ 2012-04-24 11:29 Vlad Zolotarov
0 siblings, 0 replies; 2+ messages in thread
From: Vlad Zolotarov @ 2012-04-24 11:29 UTC (permalink / raw)
To: linux-kernel
Cc: alan, Shai Fultheim (Shai@ScaleMP.com),
ido, Thomas Gleixner, H. Peter Anvin, Ingo Molnar
From: Ido Yariv <ido@wizery.com>
Some read-mostly per-cpu data may need to be declared or defined early,
so it can be initialized and accessed before per_cpu areas are
allocated.
Only the data that resides in the per_cpu areas should be read-mostly,
as there is little benefit in optimizing cache lines on initialization.
Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Shai Fultheim <shai@scalemp.com>
Signed-off-by: Vlad Zolotarov <vlad@scalemp.com>
---
arch/x86/include/asm/percpu.h | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 7a11910..6568662 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -555,6 +555,12 @@ DECLARE_PER_CPU(unsigned long, this_cpu_off);
{ [0 ... NR_CPUS-1] = _initvalue }; \
__typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
+#define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \
+ DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \
+ __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
+ { [0 ... NR_CPUS-1] = _initvalue }; \
+ __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
+
#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
EXPORT_PER_CPU_SYMBOL(_name)
@@ -563,6 +569,11 @@ DECLARE_PER_CPU(unsigned long, this_cpu_off);
extern __typeof__(_type) *_name##_early_ptr; \
extern __typeof__(_type) _name##_early_map[]
+#define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \
+ DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \
+ extern __typeof__(_type) *_name##_early_ptr; \
+ extern __typeof__(_type) _name##_early_map[]
+
#define early_per_cpu_ptr(_name) (_name##_early_ptr)
#define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
#define early_per_cpu(_name, _cpu) \
--
1.7.7.6
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH 1/2] x86: Define early read-mostly per-cpu macros
@ 2012-04-17 11:16 Vlad Zolotarov
0 siblings, 0 replies; 2+ messages in thread
From: Vlad Zolotarov @ 2012-04-17 11:16 UTC (permalink / raw)
To: linux-kernel, Thomas Gleixner, Ingo Molnar, H. Peter Anvin
Cc: Shai Fultheim (Shai@ScaleMP.com), ido
From: Ido Yariv <ido@wizery.com>
Some read-mostly per-cpu data may need to be declared or defined early,
so it can be initialized and accessed before per_cpu areas are
allocated.
Only the data that resides in the per_cpu areas should be read-mostly,
as there is little benefit in optimizing cache lines on initialization.
Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Shai Fultheim <shai@scalemp.com>
Signed-off-by: Vlad Zolotarov <vlad@scalemp.com>
---
arch/x86/include/asm/percpu.h | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 7a11910..6568662 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -555,6 +555,12 @@ DECLARE_PER_CPU(unsigned long, this_cpu_off);
{ [0 ... NR_CPUS-1] = _initvalue }; \
__typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
+#define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \
+ DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \
+ __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \
+ { [0 ... NR_CPUS-1] = _initvalue }; \
+ __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map
+
#define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \
EXPORT_PER_CPU_SYMBOL(_name)
@@ -563,6 +569,11 @@ DECLARE_PER_CPU(unsigned long, this_cpu_off);
extern __typeof__(_type) *_name##_early_ptr; \
extern __typeof__(_type) _name##_early_map[]
+#define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \
+ DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \
+ extern __typeof__(_type) *_name##_early_ptr; \
+ extern __typeof__(_type) _name##_early_map[]
+
#define early_per_cpu_ptr(_name) (_name##_early_ptr)
#define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
#define early_per_cpu(_name, _cpu) \
--
1.7.7.6
^ permalink raw reply related [flat|nested] 2+ messages in thread
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