From: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Track the actual time spent in C-States (C2 upwards, we can't determine this
for C1), not only the number of invocations. This is especially useful for
dynamic ticks / "tickless systems", but is also of interest on normal systems,
as any interrupt activity leads to C-States being exited, not only the timer
interrupt.
The time is being measured in PM timer ticks, so an increase by one equals 279
nanoseconds.
Signed-off-by: Dominik Brodowski <linux@xxxxxxxxxxxxxxxxxxxx>
Cc: <linux-acpi@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/acpi/processor_idle.c | 10 ++++++----
include/acpi/processor.h | 1 +
2 files changed, 7 insertions(+), 4 deletions(-)
diff -puN drivers/acpi/processor_idle.c~acpi-c-states-accounting-of-sleep-states drivers/acpi/processor_idle.c
--- a/drivers/acpi/processor_idle.c~acpi-c-states-accounting-of-sleep-states
+++ a/drivers/acpi/processor_idle.c
@@ -325,8 +325,6 @@ static void acpi_processor_idle(void)
cx = &pr->power.states[ACPI_STATE_C1];
#endif
- cx->usage++;
-
/*
* Sleep:
* ------
@@ -424,6 +422,9 @@ static void acpi_processor_idle(void)
local_irq_enable();
return;
}
+ cx->usage++;
+ if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
+ cx->time += sleep_ticks;
next_state = pr->power.state;
@@ -1058,9 +1059,10 @@ static int acpi_processor_power_seq_show
else
seq_puts(seq, "demotion[--] ");
- seq_printf(seq, "latency[%03d] usage[%08d]\n",
+ seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
pr->power.states[i].latency,
- pr->power.states[i].usage);
+ pr->power.states[i].usage,
+ pr->power.states[i].time);
}
end:
diff -puN include/acpi/processor.h~acpi-c-states-accounting-of-sleep-states include/acpi/processor.h
--- a/include/acpi/processor.h~acpi-c-states-accounting-of-sleep-states
+++ a/include/acpi/processor.h
@@ -62,6 +62,7 @@ struct acpi_processor_cx {
u32 latency_ticks;
u32 power;
u32 usage;
+ u64 time;
struct acpi_processor_cx_policy promotion;
struct acpi_processor_cx_policy demotion;
};
_
-
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