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Commit a3c6598f authored by Dominik Brodowski's avatar Dominik Brodowski Committed by Len Brown
Browse files

ACPI: C-States: accounting of sleep states 



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: default avatarDominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 95b38b3f

drivers/acpi/processor_idle.c

+6 −4
Original line number Diff line number Diff line
@@ -322,8 +322,6 @@ static void acpi_processor_idle(void) 
		cx = &pr->power.states[ACPI_STATE_C1];

#endif



	cx->usage++;



	/*

	 * Sleep:

	 * ------
@@ -430,6 +428,9 @@ 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;
@@ -1053,9 +1054,10 @@ static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset) 
		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:

include/acpi/processor.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

};