Messages in this thread Patch in this message | | | Subject | [PATCH] irq.h remove padding from irq_desc on 64bits | From | Richard Kennedy <> | Date | Sun, 23 Nov 2008 14:34:43 +0000 |
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struct irq_desc : reorder to remove padding on 64bits
shrinks irq_desc to 128 bytes which saves data space & cache lines
On a generic x86_64/SMP build this reduces the reported data size by 64k.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
---- This patch is against 2.628-rc6, built & tested on AMD 64x2 desktop.
regards Richard
diff --git a/include/linux/irq.h b/include/linux/irq.h index d058c57..838a977 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -142,8 +142,8 @@ struct irq_chip { * @depth: disable-depth, for nested irq_disable() calls * @wake_depth: enable depth, for multiple set_irq_wake() callers * @irq_count: stats field to detect stalled irqs - * @irqs_unhandled: stats field for spurious unhandled interrupts * @last_unhandled: aging timer for unhandled count + * @irqs_unhandled: stats field for spurious unhandled interrupts * @lock: locking for SMP * @affinity: IRQ affinity on SMP * @cpu: cpu index useful for balancing @@ -165,8 +165,8 @@ struct irq_desc { unsigned int depth; /* nested irq disables */ unsigned int wake_depth; /* nested wake enables */ unsigned int irq_count; /* For detecting broken IRQs */ - unsigned int irqs_unhandled; unsigned long last_unhandled; /* Aging timer for unhandled count */ + unsigned int irqs_unhandled; spinlock_t lock; #ifdef CONFIG_SMP cpumask_t affinity;
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