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authorMilton Miller <miltonm@bga.com>2010-01-18 13:00:51 +1100
committerIngo Molnar <mingo@elte.hu>2010-01-18 09:02:59 +0100
commite03bcb68629c7f0728c95f1afe06ce48565c7713 (patch)
tree3fdede3a2cefaedf1f5838e83c893a7564e548c9 /kernel/smp.c
parent6ccf80eb15ccaca4d3f1ab5162b9ded5eecd9971 (diff)
downloadop-kernel-dev-e03bcb68629c7f0728c95f1afe06ce48565c7713.zip
op-kernel-dev-e03bcb68629c7f0728c95f1afe06ce48565c7713.tar.gz
generic-ipi: Optimize accesses by using DEFINE_PER_CPU_SHARED_ALIGNED for IPI data
The smp ipi data is passed around and given write access by other cpus and should be separated from per-cpu data consumed by this cpu. Looking for hot lines, I saw call_function_data shared with tick_cpu_sched. Signed-off-by: Milton Miller <miltonm@bga.com> Acked-by: Anton Blanchard <anton@samba.org> Acked-by: Jens Axboe <jens.axboe@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: : Nick Piggin <npiggin@suse.de> LKML-Reference: <20100118020051.GR12666@kryten> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/smp.c')
-rw-r--r--kernel/smp.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index f104084..9867b6b 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -12,8 +12,6 @@
#include <linux/smp.h>
#include <linux/cpu.h>
-static DEFINE_PER_CPU(struct call_single_queue, call_single_queue);
-
static struct {
struct list_head queue;
raw_spinlock_t lock;
@@ -33,12 +31,14 @@ struct call_function_data {
cpumask_var_t cpumask;
};
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct call_function_data, cfd_data);
+
struct call_single_queue {
struct list_head list;
raw_spinlock_t lock;
};
-static DEFINE_PER_CPU(struct call_function_data, cfd_data);
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct call_single_queue, call_single_queue);
static int
hotplug_cfd(struct notifier_block *nfb, unsigned long action, void *hcpu)
@@ -256,7 +256,7 @@ void generic_smp_call_function_single_interrupt(void)
}
}
-static DEFINE_PER_CPU(struct call_single_data, csd_data);
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct call_single_data, csd_data);
/*
* smp_call_function_single - Run a function on a specific CPU
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