Commit cd85d551 authored by Helge Deller's avatar Helge Deller

parisc: more irq statistics in /proc/interrupts

Add framework and initial values for more fine grained statistics in
/proc/interrupts.
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 200c8804
/* hardirq.h: PA-RISC hard IRQ support. /* hardirq.h: PA-RISC hard IRQ support.
* *
* Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx> * Copyright (C) 2001 Matthew Wilcox <matthew@wil.cx>
* Copyright (C) 2013 Helge Deller <deller@gmx.de>
*/ */
#ifndef _PARISC_HARDIRQ_H #ifndef _PARISC_HARDIRQ_H
#define _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 */ #endif /* _PARISC_HARDIRQ_H */
...@@ -112,7 +112,6 @@ struct cpuinfo_parisc { ...@@ -112,7 +112,6 @@ struct cpuinfo_parisc {
unsigned long txn_addr; /* MMIO addr of EIR or id_eid */ unsigned long txn_addr; /* MMIO addr of EIR or id_eid */
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
unsigned long pending_ipi; /* bitmap of type ipi_message_type */ unsigned long pending_ipi; /* bitmap of type ipi_message_type */
unsigned long ipi_count; /* number ipi Interrupts */
#endif #endif
unsigned long bh_count; /* number of times bh was invoked */ unsigned long bh_count; /* number of times bh was invoked */
unsigned long prof_counter; /* per CPU profiling support */ unsigned long prof_counter; /* per CPU profiling support */
......
...@@ -152,6 +152,40 @@ static struct irq_chip cpu_interrupt_type = { ...@@ -152,6 +152,40 @@ static struct irq_chip cpu_interrupt_type = {
.irq_retrigger = NULL, .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 show_interrupts(struct seq_file *p, void *v)
{ {
int i = *(loff_t *) v, j; int i = *(loff_t *) v, j;
...@@ -219,6 +253,9 @@ int show_interrupts(struct seq_file *p, void *v) ...@@ -219,6 +253,9 @@ int show_interrupts(struct seq_file *p, void *v)
raw_spin_unlock_irqrestore(&desc->lock, flags); raw_spin_unlock_irqrestore(&desc->lock, flags);
} }
if (i == NR_IRQS)
arch_show_interrupts(p, 3);
return 0; return 0;
} }
...@@ -340,13 +377,22 @@ static inline void stack_overflow_check(struct pt_regs *regs) ...@@ -340,13 +377,22 @@ static inline void stack_overflow_check(struct pt_regs *regs)
/* Our stack starts directly behind the thread_info struct. */ /* Our stack starts directly behind the thread_info struct. */
unsigned long stack_start = (unsigned long) current_thread_info(); unsigned long stack_start = (unsigned long) current_thread_info();
unsigned long sp = regs->gr[30]; 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 /* 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. */ * to check for stack overflow. We will only check the kernel stack. */
if (regs->sr[7]) if (regs->sr[7])
return; 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; return;
pr_emerg("stackcheck: %s will most likely overflow kernel stack " pr_emerg("stackcheck: %s will most likely overflow kernel stack "
......
...@@ -127,7 +127,7 @@ ipi_interrupt(int irq, void *dev_id) ...@@ -127,7 +127,7 @@ ipi_interrupt(int irq, void *dev_id)
unsigned long flags; unsigned long flags;
/* Count this now; we may make a call that never returns. */ /* 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. */ mb(); /* Order interrupt and bit testing. */
...@@ -155,6 +155,7 @@ ipi_interrupt(int irq, void *dev_id) ...@@ -155,6 +155,7 @@ ipi_interrupt(int irq, void *dev_id)
case IPI_RESCHEDULE: case IPI_RESCHEDULE:
smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu); smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu);
inc_irq_stat(irq_resched_count);
scheduler_ipi(); scheduler_ipi();
break; break;
......
...@@ -1069,6 +1069,7 @@ void flush_tlb_all(void) ...@@ -1069,6 +1069,7 @@ void flush_tlb_all(void)
{ {
int do_recycle; int do_recycle;
inc_irq_stat(irq_tlb_count);
do_recycle = 0; do_recycle = 0;
spin_lock(&sid_lock); spin_lock(&sid_lock);
if (dirty_space_ids > RECYCLE_THRESHOLD) { if (dirty_space_ids > RECYCLE_THRESHOLD) {
...@@ -1089,6 +1090,7 @@ void flush_tlb_all(void) ...@@ -1089,6 +1090,7 @@ void flush_tlb_all(void)
#else #else
void flush_tlb_all(void) void flush_tlb_all(void)
{ {
inc_irq_stat(irq_tlb_count);
spin_lock(&sid_lock); spin_lock(&sid_lock);
flush_tlb_all_local(NULL); flush_tlb_all_local(NULL);
recycle_sids(); recycle_sids();
......
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