From a3c6598f92cf27d3d201a2a5b052563148156837 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Sat, 24 Jun 2006 19:37:00 -0400 Subject: [PATCH] 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: Dominik Brodowski Signed-off-by: Andrew Morton Signed-off-by: Len Brown --- drivers/acpi/processor_idle.c | 10 ++++++---- include/acpi/processor.h | 1 + 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 89d3fd4c3cd2..6d1e238e2375 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -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: diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 77371b3cdc44..9dd5b75961f8 100644 --- a/include/acpi/processor.h +++ b/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; };