ACPI: C-States: accounting of sleep states (a3c6598f) · Commits · 戴 / test

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>

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;
		};

Admin message