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ACPI: C-States: accounting of sleep states

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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@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Dominik Brodowski 2006-06-24 19:37:00 -04:00 • committed by Len Brown
parent 95b38b3f45
commit a3c6598f92
2 changed files with 7 additions and 4 deletions
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1
include/acpi/processor.h
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@ -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;
};