Ingo, Thomas, Venki, Adam,
Ingo sent some sched hooks to acpi_processor_idle() upstream.
As the cpuidle in the acpi test branch deleted this function,
that results in a merge conflict.
The patch below should resolve the conflict -- but to be honest
I'm pretty zonked right now and could have easily screwed it up,
so give it a look.
thanks,
-Len
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index c980cbc..00f1f89 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -64,6 +64,7 @@
ACPI_MODULE_NAME("processor_idle");
#define ACPI_PROCESSOR_FILE_POWER "power"
#define PM_TIMER_TICKS_TO_US(p) (((p) *
1000)/(PM_TIMER_FREQUENCY/1000))
+#define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY)
#define C2_OVERHEAD 1 /* 1us */
#define C3_OVERHEAD 1 /* 1us */
@@ -815,6 +816,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device
*dev,
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
u32 t1, t2;
+ int sleep_ticks;
pr = processors[smp_processor_id()];
if (unlikely(!pr))
@@ -841,6 +843,8 @@ static int acpi_idle_enter_simple(struct cpuidle_device
*dev,
ACPI_FLUSH_CPU_CACHE();
t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ /* Tell the scheduler that we are going deep-idle: */
+ sched_clock_idle_sleep_event();
acpi_state_timer_broadcast(pr, cx, 1);
acpi_idle_do_entry(cx);
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
@@ -850,13 +854,23 @@ static int acpi_idle_enter_simple(struct cpuidle_device
*dev,
mark_tsc_unstable("TSC halts in idle");;
#endif
+ /* Compute time (ticks) that we were actually asleep */
+ sleep_ticks = ticks_elapsed(t1, t2);
+
+ /* Tell the scheduler how much we idled: */
+ sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
+
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
cx->usage++;
acpi_state_timer_broadcast(pr, cx, 0);
- cx->time += ticks_elapsed(t1, t2);
+
+ /* Do not account our idle-switching overhead: */
+ sleep_ticks -= cx->latency_ticks + C2_OVERHEAD;
+
+ cx->time += sleep_ticks;
return ticks_elapsed_in_us(t1, t2);
}
@@ -876,6 +890,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
struct acpi_processor *pr;
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
u32 t1, t2;
+ int sleep_ticks;
pr = processors[smp_processor_id()];
if (unlikely(!pr))
@@ -907,6 +922,10 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
acpi_idle_update_bm_rld(pr, cx);
t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+
+ /* Tell the scheduler that we are going deep-idle: */
+ sched_clock_idle_sleep_event();
+
acpi_idle_do_entry(cx);
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
} else {
@@ -920,6 +939,10 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
spin_unlock(&c3_lock);
t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+
+ /* Tell the scheduler that we are going deep-idle: */
+ sched_clock_idle_sleep_event();
+
acpi_idle_do_entry(cx);
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
@@ -936,13 +959,23 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
mark_tsc_unstable("TSC halts in idle");
#endif
+ /* Compute time (ticks) that we were actually asleep */
+ sleep_ticks = ticks_elapsed(t1, t2);
+
+ /* Tell the scheduler how much we idled: */
+ sched_clock_idle_wakeup_event(sleep_ticks*PM_TIMER_TICK_NS);
+
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
cx->usage++;
acpi_state_timer_broadcast(pr, cx, 0);
- cx->time += ticks_elapsed(t1, t2);
+
+ /* Do not account our idle-switching overhead: */
+ sleep_ticks -= cx->latency_ticks + C3_OVERHEAD;
+
+ cx->time += sleep_ticks;
return ticks_elapsed_in_us(t1, t2);
}
-
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