From 4a88abd7b48e8ec8084b1252d0f5ebdab43c2508 Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 15 Nov 2010 14:40:29 +0000 Subject: ARM: SMP: provide individual IPI interrupt statistics 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 Signed-off-by: Russell King --- arch/arm/kernel/smp.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-) (limited to 'arch/arm/kernel/smp.c') diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 269237ed76a0..fa0c5f6e1587 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -382,16 +382,28 @@ void arch_send_call_function_single_ipi(int cpu) 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) { - 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) - seq_printf(p, "%10u ", __get_irq_stat(cpu, ipi_irqs)); + for_each_present_cpu(cpu) + 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(); 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) { case IPI_TIMER: -- cgit v1.2.3