diff options
Diffstat (limited to 'arch/i386/kernel/vmitime.c')
| -rw-r--r-- | arch/i386/kernel/vmitime.c | 69 |
1 files changed, 26 insertions, 43 deletions
diff --git a/arch/i386/kernel/vmitime.c b/arch/i386/kernel/vmitime.c index 76d2adc..9dfb177 100644 --- a/arch/i386/kernel/vmitime.c +++ b/arch/i386/kernel/vmitime.c @@ -123,12 +123,10 @@ static struct clocksource clocksource_vmi = { static irqreturn_t vmi_timer_interrupt(int irq, void *dev_id); static struct irqaction vmi_timer_irq = { - vmi_timer_interrupt, - SA_INTERRUPT, - CPU_MASK_NONE, - "VMI-alarm", - NULL, - NULL + .handler = vmi_timer_interrupt, + .flags = IRQF_DISABLED, + .mask = CPU_MASK_NONE, + .name = "VMI-alarm", }; /* Alarm rate */ @@ -153,13 +151,6 @@ static void vmi_get_wallclock_ts(struct timespec *ts) ts->tv_sec = wallclock; } -static void update_xtime_from_wallclock(void) -{ - struct timespec ts; - vmi_get_wallclock_ts(&ts); - do_settimeofday(&ts); -} - unsigned long vmi_get_wallclock(void) { struct timespec ts; @@ -172,11 +163,20 @@ int vmi_set_wallclock(unsigned long now) return -1; } -unsigned long long vmi_sched_clock(void) +unsigned long long vmi_get_sched_cycles(void) { return read_available_cycles(); } +unsigned long vmi_cpu_khz(void) +{ + unsigned long long khz; + + khz = vmi_timer_ops.get_cycle_frequency(); + (void)do_div(khz, 1000); + return khz; +} + void __init vmi_time_init(void) { unsigned long long cycles_per_sec, cycles_per_msec; @@ -188,25 +188,16 @@ void __init vmi_time_init(void) set_intr_gate(LOCAL_TIMER_VECTOR, apic_vmi_timer_interrupt); #endif - no_sync_cmos_clock = 1; - - vmi_get_wallclock_ts(&xtime); - set_normalized_timespec(&wall_to_monotonic, - -xtime.tv_sec, -xtime.tv_nsec); - real_cycles_accounted_system = read_real_cycles(); - update_xtime_from_wallclock(); per_cpu(process_times_cycles_accounted_cpu, 0) = read_available_cycles(); cycles_per_sec = vmi_timer_ops.get_cycle_frequency(); - cycles_per_jiffy = cycles_per_sec; (void)do_div(cycles_per_jiffy, HZ); cycles_per_alarm = cycles_per_sec; (void)do_div(cycles_per_alarm, alarm_hz); cycles_per_msec = cycles_per_sec; (void)do_div(cycles_per_msec, 1000); - cpu_khz = cycles_per_msec; printk(KERN_WARNING "VMI timer cycles/sec = %llu ; cycles/jiffy = %llu ;" "cycles/alarm = %llu\n", cycles_per_sec, cycles_per_jiffy, @@ -250,7 +241,7 @@ void __init vmi_timer_setup_boot_alarm(void) /* Initialize the time accounting variables for an AP on an SMP system. * Also, set the local alarm for the AP. */ -void __init vmi_timer_setup_secondary_alarm(void) +void __devinit vmi_timer_setup_secondary_alarm(void) { int cpu = smp_processor_id(); @@ -276,16 +267,13 @@ static void vmi_account_real_cycles(unsigned long long cur_real_cycles) cycles_not_accounted = cur_real_cycles - real_cycles_accounted_system; while (cycles_not_accounted >= cycles_per_jiffy) { - /* systems wide jiffies and wallclock. */ + /* systems wide jiffies. */ do_timer(1); cycles_not_accounted -= cycles_per_jiffy; real_cycles_accounted_system += cycles_per_jiffy; } - if (vmi_timer_ops.wallclock_updated()) - update_xtime_from_wallclock(); - write_sequnlock(&xtime_lock); } @@ -380,7 +368,6 @@ int vmi_stop_hz_timer(void) unsigned long seq, next; unsigned long long real_cycles_expiry; int cpu = smp_processor_id(); - int idle; BUG_ON(!irqs_disabled()); if (sysctl_hz_timer != 0) @@ -388,13 +375,13 @@ int vmi_stop_hz_timer(void) cpu_set(cpu, nohz_cpu_mask); smp_mb(); + if (rcu_needs_cpu(cpu) || local_softirq_pending() || - (next = next_timer_interrupt(), time_before_eq(next, jiffies))) { + (next = next_timer_interrupt(), + time_before_eq(next, jiffies + HZ/CONFIG_VMI_ALARM_HZ))) { cpu_clear(cpu, nohz_cpu_mask); - next = jiffies; - idle = 0; - } else - idle = 1; + return 0; + } /* Convert jiffies to the real cycle counter. */ do { @@ -404,17 +391,13 @@ int vmi_stop_hz_timer(void) } while (read_seqretry(&xtime_lock, seq)); /* This cpu is going idle. Disable the periodic alarm. */ - if (idle) { - vmi_timer_ops.cancel_alarm(VMI_CYCLES_AVAILABLE); - per_cpu(idle_start_jiffies, cpu) = jiffies; - } - + vmi_timer_ops.cancel_alarm(VMI_CYCLES_AVAILABLE); + per_cpu(idle_start_jiffies, cpu) = jiffies; /* Set the real time alarm to expire at the next event. */ vmi_timer_ops.set_alarm( - VMI_ALARM_WIRING | VMI_ALARM_IS_ONESHOT | VMI_CYCLES_REAL, - real_cycles_expiry, 0); - - return idle; + VMI_ALARM_WIRING | VMI_ALARM_IS_ONESHOT | VMI_CYCLES_REAL, + real_cycles_expiry, 0); + return 1; } static void vmi_reenable_hz_timer(int cpu) |
