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ARM: SMP: provide individual IPI interrupt statistics

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This separates out the individual IPI interrupt counts from the
total IPI count, which allows better visibility of what IPIs are
being used for.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2010-11-15 14:40:29 +00:00
parent f13cd4170e
commit 4a88abd7b4
3 changed files with 27 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/include/asm/hardirq.h
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@@ -5,13 +5,15 @@
#include <linux/threads.h> #include <linux/threads.h>
#include <asm/irq.h> #include <asm/irq.h>
#define NR_IPI 5
typedef struct { typedef struct {
unsigned int __softirq_pending; unsigned int __softirq_pending;
#ifdef CONFIG_LOCAL_TIMERS #ifdef CONFIG_LOCAL_TIMERS
unsigned int local_timer_irqs; unsigned int local_timer_irqs;
#endif #endif
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
unsigned int ipi_irqs; unsigned int ipi_irqs[NR_IPI];
#endif #endif
} ____cacheline_aligned irq_cpustat_t; } ____cacheline_aligned irq_cpustat_t;

5
arch/arm/kernel/irq.c
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@@ -62,6 +62,11 @@ int show_interrupts(struct seq_file *p, void *v)
for (prec = 3, n = 1000; prec < 10 && n <= nr_irqs; prec++) for (prec = 3, n = 1000; prec < 10 && n <= nr_irqs; prec++)
n *= 10; n *= 10;
#ifdef CONFIG_SMP
if (prec < 4)
prec = 4;
#endif
if (i == 0) { if (i == 0) {
char cpuname[12]; char cpuname[12];

25
arch/arm/kernel/smp.c
View File

@@ -382,16 +382,28 @@ void arch_send_call_function_single_ipi(int cpu)
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE); smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC_SINGLE);
} }
static const char *ipi_types[NR_IPI] = {
#define S(x,s) [x - IPI_TIMER] = s
S(IPI_TIMER, "Timer broadcast interrupts"),
S(IPI_RESCHEDULE, "Rescheduling interrupts"),
S(IPI_CALL_FUNC, "Function call interrupts"),
S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
S(IPI_CPU_STOP, "CPU stop interrupts"),
};
void show_ipi_list(struct seq_file *p, int prec) void show_ipi_list(struct seq_file *p, int prec)
{ {
unsigned int cpu; unsigned int cpu, i;
seq_printf(p, "%*s: ", prec, "IPI"); for (i = 0; i < NR_IPI; i++) {
seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
for_each_present_cpu(cpu) for_each_present_cpu(cpu)
seq_printf(p, "%10u ", __get_irq_stat(cpu, ipi_irqs)); seq_printf(p, "%10u ",
__get_irq_stat(cpu, ipi_irqs[i]));
seq_printf(p, " Inter-processor interrupts\n"); seq_printf(p, " %s\n", ipi_types[i]);
}
} }
/* /*
@@ -506,7 +518,8 @@ asmlinkage void __exception do_IPI(int ipinr, struct pt_regs *regs)
unsigned int cpu = smp_processor_id(); unsigned int cpu = smp_processor_id();
struct pt_regs *old_regs = set_irq_regs(regs); struct pt_regs *old_regs = set_irq_regs(regs);
__inc_irq_stat(cpu, ipi_irqs); if (ipinr >= IPI_TIMER && ipinr < IPI_TIMER + NR_IPI)
__inc_irq_stat(cpu, ipi_irqs[ipinr - IPI_TIMER]);
switch (ipinr) { switch (ipinr) {
case IPI_TIMER: case IPI_TIMER: