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Commit 6859a840 authored by Alan Mayer's avatar Alan Mayer Committed by Ingo Molnar
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x86: resize NR_IRQS for large machines 



On machines with very large numbers of cpus, tables that are dimensioned
by NR_IRQS get very large, especially the irq_desc table.  They are also
very sparsely used.  When the cpu count is > MAX_IO_APICS, use MAX_IO_APICS
to set NR_IRQS, otherwise use NR_CPUS.

Signed-off-by: default avatarAlan Mayer <ajm@sgi.com>
Reviewed-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 492c2e47

include/asm-x86/irq_64.h

+6 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
 *	<tomsoft@informatik.tu-chemnitz.de>

 */



#include <asm/apicdef.h>



#define TIMER_IRQ 0



/*
@@ -31,7 +33,11 @@ 


#define FIRST_SYSTEM_VECTOR	0xef   /* duplicated in hw_irq.h */



#if NR_CPUS < MAX_IO_APICS

#define NR_IRQS (NR_VECTORS + (32 * NR_CPUS))

#else

#define NR_IRQS (NR_VECTORS + (32 * MAX_IO_APICS))

#endif

#define NR_IRQ_VECTORS NR_IRQS



static inline int irq_canonicalize(int irq)

include/linux/kernel_stat.h

+1 −1
Original line number Diff line number Diff line 
#ifndef _LINUX_KERNEL_STAT_H

#define _LINUX_KERNEL_STAT_H



#include <asm/irq.h>

#include <linux/smp.h>

#include <linux/threads.h>

#include <linux/percpu.h>

#include <linux/cpumask.h>

#include <asm/irq.h>

#include <asm/cputime.h>



/*