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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2006-06-24 19:37:00 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2006-06-28 03:14:31 -0400 |
| commit | a3c6598f92cf27d3d201a2a5b052563148156837 (patch) | |
| tree | 3fad66282da16a806139ce46bad2b85175fae43a | |
| parent | 95b38b3f453c16de0f8cddcde3e71050bbfb37b9 (diff) | |
| download | kernel_samsung_crespo-a3c6598f92cf27d3d201a2a5b052563148156837.zip kernel_samsung_crespo-a3c6598f92cf27d3d201a2a5b052563148156837.tar.gz kernel_samsung_crespo-a3c6598f92cf27d3d201a2a5b052563148156837.tar.bz2 | |
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 <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Len Brown <len.brown@intel.com>
| -rw-r--r-- | drivers/acpi/processor_idle.c | 10 | ||||
| -rw-r--r-- | 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 89d3fd4..6d1e238 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 77371b3..9dd5b75 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; }; |