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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>
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95b38b3f45
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2 changed files with 7 additions and 4 deletions
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@ -322,8 +322,6 @@ static void acpi_processor_idle(void)
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cx = &pr->power.states[ACPI_STATE_C1];
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#endif
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cx->usage++;
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/*
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* Sleep:
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* ------
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@ -430,6 +428,9 @@ static void acpi_processor_idle(void)
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local_irq_enable();
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return;
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}
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cx->usage++;
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if ((cx->type != ACPI_STATE_C1) && (sleep_ticks > 0))
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cx->time += sleep_ticks;
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next_state = pr->power.state;
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@ -1053,9 +1054,10 @@ static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
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else
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seq_puts(seq, "demotion[--] ");
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seq_printf(seq, "latency[%03d] usage[%08d]\n",
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seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
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pr->power.states[i].latency,
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pr->power.states[i].usage);
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pr->power.states[i].usage,
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pr->power.states[i].time);
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}
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end:
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@ -62,6 +62,7 @@ struct acpi_processor_cx {
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u32 latency_ticks;
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u32 power;
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u32 usage;
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u64 time;
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struct acpi_processor_cx_policy promotion;
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struct acpi_processor_cx_policy demotion;
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};
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