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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-11-15 14:40:29 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-12-20 15:08:01 +0000 |
| commit | 4a88abd7b48e8ec8084b1252d0f5ebdab43c2508 (patch) | |
| tree | 6f2bd56428c4a684c1bd4a06767e78128977c492 | |
| parent | f13cd4170ee789f63b3c9585c1ae34e028bd549d (diff) | |
| download | linux-4a88abd7b48e8ec8084b1252d0f5ebdab43c2508.tar.gz linux-4a88abd7b48e8ec8084b1252d0f5ebdab43c2508.tar.bz2 linux-4a88abd7b48e8ec8084b1252d0f5ebdab43c2508.zip | |
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 <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/include/asm/hardirq.h | 4 | ||||
| -rw-r--r-- | arch/arm/kernel/irq.c | 5 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 25 |
3 files changed, 27 insertions, 7 deletions
diff --git a/arch/arm/include/asm/hardirq.h b/arch/arm/include/asm/hardirq.h index 824b08aa3f7a..c52e2507c9e0 100644 --- a/arch/arm/include/asm/hardirq.h +++ b/arch/arm/include/asm/hardirq.h @@ -5,13 +5,15 @@ #include <linux/threads.h> #include <asm/irq.h> +#define NR_IPI 5 + typedef struct { unsigned int __softirq_pending; #ifdef CONFIG_LOCAL_TIMERS unsigned int local_timer_irqs; #endif #ifdef CONFIG_SMP - unsigned int ipi_irqs; + unsigned int ipi_irqs[NR_IPI]; #endif } ____cacheline_aligned irq_cpustat_t; diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index 4e7a7d272212..6276f01df9e4 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -62,6 +62,11 @@ int show_interrupts(struct seq_file *p, void *v) for (prec = 3, n = 1000; prec < 10 && n <= nr_irqs; prec++) n *= 10; +#ifdef CONFIG_SMP + if (prec < 4) + prec = 4; +#endif + if (i == 0) { char cpuname[12]; 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: |