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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>
This commit is contained in:
Milton Miller 2010-01-18 13:00:51 +11:00 committed by Ingo Molnar
parent 6ccf80eb15
commit e03bcb6862
1 changed files with 4 additions and 4 deletions
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8
kernel/smp.c
View File

@ -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