Rework acpi_cpu_idle() to select the next idle state before sleeping, not

after.  Unify the paths for all Cx states.  Remove cpu_idle_busy and
instead do the little profiling we need before re-enabling interrupts.
Use 1 quantum as estimate for C1 sleep duration since the timer interrupt
is the main reason we wake.

While here, change the cx_history sysctl to cx_usage and report statistics
for which idle states were used in terms of percent.  This seems more
intuitive than counters.  Remove the cx_stats structure since it's no
longer used.  Update the man page.

Change various types which do not need explicit size.

1 files changed, 4 insertions, 5 deletions

diff --git a/share/man/man4/acpi.4 b/share/man/man4/acpi.4
index 8f47880..003eb57 100644
--- a/share/man/man4/acpi.4
+++ b/share/man/man4/acpi.4
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 2, 2001
+.Dd June 4, 2004
 .Dt ACPI 4
 .Os
 .Sh NAME
@@ -359,10 +359,9 @@ Maximum value for CPU throttling, equal to 100% of the clock rate.
 Get or set the current throttling state, from 1 to
 .Va hw.acpi.cpu.throttle_max .
 This scales back the CPU clock rate and the corresponding power consumption.
-.It Va hw.acpi.cpu.cx_history
-Debugging information listing all sleep states and the number of
-long and short sleeps for each one.
-The counters are reset when
+.It Va hw.acpi.cpu.cx_usage
+Debugging information listing the percent of total usage for each sleep state.
+The values are reset when
 .Va hw.acpi.cpu.cx_lowest
 is modified.
 .It Va hw.acpi.cpu.cx_lowest