iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: SMP: provide individual IPI interrupt statistics

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arm/include/asm/hardirq.h
View File

@ -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;

5
arch/arm/kernel/irq.c
View File

@ -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];

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);
}
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: