The patch titled
use the new percpu interface for shared data
has been added to the -mm tree. Its filename is
use-the-new-percpu-interface-for-shared-data-version-4.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: use the new percpu interface for shared data
From: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Currently most of the per cpu data, which is accessed by different cpus,
has a ____cacheline_aligned_in_smp attribute. Move all this data to the
new per cpu shared data section: .data.percpu.shared_aligned.
This will seperate the percpu data which is referenced frequently by other
cpus from the local only percpu data.
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Acked-by: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: "Luck, Tony" <tony.luck@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/init_task.c | 2 +-
arch/i386/kernel/irq.c | 2 +-
arch/ia64/kernel/smp.c | 2 +-
arch/x86_64/kernel/init_task.c | 2 +-
kernel/sched.c | 2 +-
5 files changed, 5 insertions(+), 5 deletions(-)
diff -puN arch/i386/kernel/init_task.c~use-the-new-percpu-interface-for-shared-data-version-4 arch/i386/kernel/init_task.c
--- a/arch/i386/kernel/init_task.c~use-the-new-percpu-interface-for-shared-data-version-4
+++ a/arch/i386/kernel/init_task.c
@@ -42,5 +42,5 @@ EXPORT_SYMBOL(init_task);
* per-CPU TSS segments. Threads are completely 'soft' on Linux,
* no more per-task TSS's.
*/
-DEFINE_PER_CPU(struct tss_struct, init_tss) ____cacheline_internodealigned_in_smp = INIT_TSS;
+DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss) = INIT_TSS;
diff -puN arch/i386/kernel/irq.c~use-the-new-percpu-interface-for-shared-data-version-4 arch/i386/kernel/irq.c
--- a/arch/i386/kernel/irq.c~use-the-new-percpu-interface-for-shared-data-version-4
+++ a/arch/i386/kernel/irq.c
@@ -21,7 +21,7 @@
#include <asm/apic.h>
#include <asm/uaccess.h>
-DEFINE_PER_CPU(irq_cpustat_t, irq_stat) ____cacheline_internodealigned_in_smp;
+DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
EXPORT_PER_CPU_SYMBOL(irq_stat);
DEFINE_PER_CPU(struct pt_regs *, irq_regs);
diff -puN arch/ia64/kernel/smp.c~use-the-new-percpu-interface-for-shared-data-version-4 arch/ia64/kernel/smp.c
--- a/arch/ia64/kernel/smp.c~use-the-new-percpu-interface-for-shared-data-version-4
+++ a/arch/ia64/kernel/smp.c
@@ -82,7 +82,7 @@ static volatile struct call_data_struct
#define IPI_KDUMP_CPU_STOP 3
/* This needs to be cacheline aligned because it is written to by *other* CPUs. */
-static DEFINE_PER_CPU(u64, ipi_operation) ____cacheline_aligned;
+static DEFINE_PER_CPU_SHARED_ALIGNED(u64, ipi_operation);
extern void cpu_halt (void);
diff -puN arch/x86_64/kernel/init_task.c~use-the-new-percpu-interface-for-shared-data-version-4 arch/x86_64/kernel/init_task.c
--- a/arch/x86_64/kernel/init_task.c~use-the-new-percpu-interface-for-shared-data-version-4
+++ a/arch/x86_64/kernel/init_task.c
@@ -44,7 +44,7 @@ EXPORT_SYMBOL(init_task);
* section. Since TSS's are completely CPU-local, we want them
* on exact cacheline boundaries, to eliminate cacheline ping-pong.
*/
-DEFINE_PER_CPU(struct tss_struct, init_tss) ____cacheline_internodealigned_in_smp = INIT_TSS;
+DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss) = INIT_TSS;
/* Copies of the original ist values from the tss are only accessed during
* debugging, no special alignment required.
diff -puN kernel/sched.c~use-the-new-percpu-interface-for-shared-data-version-4 kernel/sched.c
--- a/kernel/sched.c~use-the-new-percpu-interface-for-shared-data-version-4
+++ a/kernel/sched.c
@@ -304,7 +304,7 @@ struct rq {
struct lock_class_key rq_lock_key;
};
-static DEFINE_PER_CPU(struct rq, runqueues) ____cacheline_aligned_in_smp;
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
static DEFINE_MUTEX(sched_hotcpu_mutex);
static inline int cpu_of(struct rq *rq)
_
Patches currently in -mm which might be from fenghua.yu@xxxxxxxxx are
define-new-percpu-interface-for-shared-data-version-4.patch
use-the-new-percpu-interface-for-shared-data-version-4.patch
-
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