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add code to evaluate the time for an interrupt

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This commit is contained in:
Stefan Lankes 2016-03-04 23:53:14 +01:00
parent 454809db43
commit 2c200558f1
2 changed files with 34 additions and 0 deletions
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4
hermit/arch/x86/include/asm/irq.h
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@ -73,6 +73,10 @@ int irq_uninstall_handler(unsigned int irq);
*/
int irq_init(void);
/** @brief reset the counters of the received interrupts
*/
void reset_irq_stats(void);
/** @brief Print the number of received interrupts
*/
void print_irq_stats(void);

30
hermit/arch/x86/kernel/irq.c
View file

@ -83,6 +83,7 @@ extern void wakeup(void);
extern void mmnif_irq(void);
#define MAX_HANDLERS 256
//#define MEASURE_IRQ
/** @brief IRQ handle pointers
*
@ -91,6 +92,9 @@ extern void mmnif_irq(void);
*/
static void* irq_routines[MAX_HANDLERS] = {[0 ... MAX_HANDLERS-1] = NULL};
static uint64_t irq_counter[MAX_CORES][MAX_HANDLERS] = {[0 ... MAX_CORES-1][0 ... MAX_HANDLERS-1] = 0};
#ifdef MEASURE_IRQ
static int go = 0;
#endif
/* This installs a custom IRQ handler for the given IRQ */
int irq_install_handler(unsigned int irq, irq_handler_t handler)
@ -271,10 +275,18 @@ int irq_init(void)
size_t** irq_handler(struct state *s)
{
size_t** ret = NULL;
#ifdef MEASURE_IRQ
uint64_t diff = 0;
#endif
/* This is a blank function pointer */
void (*handler) (struct state * s);
#ifdef MEASURE_IRQ
if (go)
diff = rdtsc();
#endif
irq_counter[CORE_ID][s->int_no]++;
check_workqueues_in_irqhandler(s->int_no);
@ -299,9 +311,27 @@ size_t** irq_handler(struct state *s)
apic_eoi(s->int_no);
#ifdef MEASURE_IRQ
if (go) {
diff = rdtsc() - diff;
if (diff > 15000)
{
kprintf("Core %d, irq_no %d: %lld : %lld\n", CORE_ID, s->int_no, irq_counter[CORE_ID][s->int_no], diff);
}
}
#endif
return ret;
}
void reset_irq_stats(void)
{
#ifdef MEASURE_IRQ
go = 1;
#endif
memset(irq_counter, 0x00, sizeof(uint64_t)*MAX_CORES*MAX_HANDLERS);
}
void print_irq_stats(void)
{
uint32_t i, j;