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parisc: more irq statistics in /proc/interrupts

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Add framework and initial values for more fine grained statistics in
/proc/interrupts.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2013-05-06 19:20:26 +00:00
parent 200c880420
commit cd85d5514d
5 changed files with 86 additions and 4 deletions
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36
arch/parisc/include/asm/hardirq.h
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@ -1,11 +1,45 @@
/* hardirq.h: PA-RISC hard IRQ support.
*
* Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
* Copyright (C) 2013 Helge Deller <deller@gmx.de>
*/
#ifndef _PARISC_HARDIRQ_H
#define _PARISC_HARDIRQ_H
#include <asm-generic/hardirq.h>
#include <linux/cache.h>
#include <linux/threads.h>
#include <linux/irq.h>
typedef struct {
unsigned int __softirq_pending;
#ifdef CONFIG_DEBUG_STACKOVERFLOW
unsigned int kernel_stack_usage;
#endif
#ifdef CONFIG_SMP
unsigned int irq_resched_count;
unsigned int irq_call_count;
/*
* irq_tlb_count is double-counted in irq_call_count, so it must be
* subtracted from irq_call_count when displaying irq_call_count
*/
unsigned int irq_tlb_count;
#endif
} ____cacheline_aligned irq_cpustat_t;
DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
#define __ARCH_IRQ_STAT
#define __IRQ_STAT(cpu, member) (irq_stat[cpu].member)
#define inc_irq_stat(member) this_cpu_inc(irq_stat.member)
#define local_softirq_pending() this_cpu_read(irq_stat.__softirq_pending)
#define __ARCH_SET_SOFTIRQ_PENDING
#define set_softirq_pending(x) \
this_cpu_write(irq_stat.__softirq_pending, (x))
#define or_softirq_pending(x) this_cpu_or(irq_stat.__softirq_pending, (x))
#define ack_bad_irq(irq) WARN(1, "unexpected IRQ trap at vector %02x\n", irq)
#endif /* _PARISC_HARDIRQ_H */

1
arch/parisc/include/asm/processor.h
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@ -112,7 +112,6 @@ struct cpuinfo_parisc {
unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
#ifdef CONFIG_SMP
unsigned long pending_ipi; /* bitmap of type ipi_message_type */
unsigned long ipi_count; /* number ipi Interrupts */
#endif
unsigned long bh_count; /* number of times bh was invoked */
unsigned long prof_counter; /* per CPU profiling support */

48
arch/parisc/kernel/irq.c
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@ -152,6 +152,40 @@ static struct irq_chip cpu_interrupt_type = {
.irq_retrigger = NULL,
};
DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
#define irq_stats(x) (&per_cpu(irq_stat, x))
/*
* /proc/interrupts printing for arch specific interrupts
*/
int arch_show_interrupts(struct seq_file *p, int prec)
{
int j;
#ifdef CONFIG_DEBUG_STACKOVERFLOW
seq_printf(p, "%*s: ", prec, "STK");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->kernel_stack_usage);
seq_printf(p, " Kernel stack usage\n");
#endif
#ifdef CONFIG_SMP
seq_printf(p, "%*s: ", prec, "RES");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
seq_printf(p, " Rescheduling interrupts\n");
seq_printf(p, "%*s: ", prec, "CAL");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->irq_call_count -
irq_stats(j)->irq_tlb_count);
seq_printf(p, " Function call interrupts\n");
seq_printf(p, "%*s: ", prec, "TLB");
for_each_online_cpu(j)
seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
seq_printf(p, " TLB shootdowns\n");
#endif
return 0;
}
int show_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j;
@ -219,6 +253,9 @@ int show_interrupts(struct seq_file *p, void *v)
raw_spin_unlock_irqrestore(&desc->lock, flags);
}
if (i == NR_IRQS)
arch_show_interrupts(p, 3);
return 0;
}
@ -340,13 +377,22 @@ static inline void stack_overflow_check(struct pt_regs *regs)
/* Our stack starts directly behind the thread_info struct. */
unsigned long stack_start = (unsigned long) current_thread_info();
unsigned long sp = regs->gr[30];
unsigned long stack_usage;
unsigned int *last_usage;
/* if sr7 != 0, we interrupted a userspace process which we do not want
* to check for stack overflow. We will only check the kernel stack. */
if (regs->sr[7])
return;
if (likely((sp - stack_start) < (THREAD_SIZE - STACK_MARGIN)))
/* calculate kernel stack usage */
stack_usage = sp - stack_start;
last_usage = &per_cpu(irq_stat.kernel_stack_usage, smp_processor_id());
if (unlikely(stack_usage > *last_usage))
*last_usage = stack_usage;
if (likely(stack_usage < (THREAD_SIZE - STACK_MARGIN)))
return;
pr_emerg("stackcheck: %s will most likely overflow kernel stack "

3
arch/parisc/kernel/smp.c
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@ -127,7 +127,7 @@ ipi_interrupt(int irq, void *dev_id)
unsigned long flags;
/* Count this now; we may make a call that never returns. */
p->ipi_count++;
inc_irq_stat(irq_call_count);
mb(); /* Order interrupt and bit testing. */
@ -155,6 +155,7 @@ ipi_interrupt(int irq, void *dev_id)
case IPI_RESCHEDULE:
smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);
inc_irq_stat(irq_resched_count);
scheduler_ipi();
break;

2
arch/parisc/mm/init.c
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@ -1069,6 +1069,7 @@ void flush_tlb_all(void)
{
int do_recycle;
inc_irq_stat(irq_tlb_count);
do_recycle = 0;
spin_lock(&sid_lock);
if (dirty_space_ids > RECYCLE_THRESHOLD) {
@ -1089,6 +1090,7 @@ void flush_tlb_all(void)
#else
void flush_tlb_all(void)
{
inc_irq_stat(irq_tlb_count);
spin_lock(&sid_lock);
flush_tlb_all_local(NULL);
recycle_sids();