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6859a84029
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: Alan Mayer <ajm@sgi.com> Reviewed-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
#ifndef _LINUX_KERNEL_STAT_H
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#define _LINUX_KERNEL_STAT_H
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <linux/percpu.h>
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#include <linux/cpumask.h>
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#include <asm/irq.h>
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#include <asm/cputime.h>
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/*
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* 'kernel_stat.h' contains the definitions needed for doing
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* some kernel statistics (CPU usage, context switches ...),
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* used by rstatd/perfmeter
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*/
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struct cpu_usage_stat {
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cputime64_t user;
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cputime64_t nice;
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cputime64_t system;
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cputime64_t softirq;
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cputime64_t irq;
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cputime64_t idle;
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cputime64_t iowait;
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cputime64_t steal;
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cputime64_t guest;
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};
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struct kernel_stat {
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struct cpu_usage_stat cpustat;
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unsigned int irqs[NR_IRQS];
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};
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DECLARE_PER_CPU(struct kernel_stat, kstat);
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#define kstat_cpu(cpu) per_cpu(kstat, cpu)
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/* Must have preemption disabled for this to be meaningful. */
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#define kstat_this_cpu __get_cpu_var(kstat)
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extern unsigned long long nr_context_switches(void);
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/*
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* Number of interrupts per specific IRQ source, since bootup
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*/
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static inline int kstat_irqs(int irq)
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{
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int cpu, sum = 0;
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for_each_possible_cpu(cpu)
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sum += kstat_cpu(cpu).irqs[irq];
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return sum;
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}
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extern void account_user_time(struct task_struct *, cputime_t);
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extern void account_user_time_scaled(struct task_struct *, cputime_t);
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extern void account_system_time(struct task_struct *, int, cputime_t);
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extern void account_system_time_scaled(struct task_struct *, cputime_t);
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extern void account_steal_time(struct task_struct *, cputime_t);
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#endif /* _LINUX_KERNEL_STAT_H */
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