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x86/irq: use move_irq_desc() in create_irq_nr()

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move_irq_desc() will try to move irq_desc to the home node if
the allocated one is not correct, in create_irq_nr().

( This can happen on devices that are on different nodes that
  are using MSI, when drivers are loaded and unloaded randomly. )

v2: fix non-smp build
v3: add NUMA_IRQ_DESC to eliminate #ifdefs

[ Impact: improve irq descriptor locality on NUMA systems ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <49F95EAE.2050903@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2009-04-30 01:17:50 -07:00 committed by Ingo Molnar
parent 56b581ea95
commit 15e957d08d
4 changed files with 15 additions and 8 deletions
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4
arch/x86/Kconfig
View file

@ -274,6 +274,10 @@ config SPARSE_IRQ
If you don't know what to do here, say N. If you don't know what to do here, say N.
config NUMA_IRQ_DESC
def_bool y
depends on SPARSE_IRQ && NUMA
config X86_MPPARSE config X86_MPPARSE
bool "Enable MPS table" if ACPI bool "Enable MPS table" if ACPI
default y default y

6
arch/x86/kernel/apic/io_apic.c
View file

@ -3197,11 +3197,7 @@ unsigned int create_irq_nr(unsigned int irq_want, int node)
if (cfg_new->vector != 0) if (cfg_new->vector != 0)
continue; continue;
#ifdef CONFIG_NUMA_IRQ_DESC desc_new = move_irq_desc(desc_new, node);
/* different node ?*/
if (desc_new->node != node)
desc = move_irq_desc(desc, node);
#endif
if (__assign_irq_vector(new, cfg_new, apic->target_cpus()) == 0) if (__assign_irq_vector(new, cfg_new, apic->target_cpus()) == 0)
irq = new; irq = new;

11
include/linux/irq.h
View file

@ -206,9 +206,16 @@ extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc
#ifndef CONFIG_SPARSE_IRQ #ifndef CONFIG_SPARSE_IRQ
extern struct irq_desc irq_desc[NR_IRQS]; extern struct irq_desc irq_desc[NR_IRQS];
#else /* CONFIG_SPARSE_IRQ */ #endif
#ifdef CONFIG_NUMA_IRQ_DESC
extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node); extern struct irq_desc *move_irq_desc(struct irq_desc *old_desc, int node);
#endif /* CONFIG_SPARSE_IRQ */ #else
static inline struct irq_desc *move_irq_desc(struct irq_desc *desc, int node)
{
return desc;
}
#endif
extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node); extern struct irq_desc *irq_to_desc_alloc_node(unsigned int irq, int node);

2
kernel/irq/Makefile
View file

@ -3,5 +3,5 @@ obj-y := handle.o manage.o spurious.o resend.o chip.o devres.o
obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o obj-$(CONFIG_GENERIC_IRQ_PROBE) += autoprobe.o
obj-$(CONFIG_PROC_FS) += proc.o obj-$(CONFIG_PROC_FS) += proc.o
obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o obj-$(CONFIG_GENERIC_PENDING_IRQ) += migration.o
obj-$(CONFIG_SPARSE_IRQ) += numa_migrate.o obj-$(CONFIG_NUMA_IRQ_DESC) += numa_migrate.o
obj-$(CONFIG_PM_SLEEP) += pm.o obj-$(CONFIG_PM_SLEEP) += pm.o