[Xen-changelog] [xen-unstable] CPUIDLE: Adjust Cx residency to contain Cx exit latency & overhead.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1221041833 -3600
# Node ID cfbe4df8d47c4fb1644eb5dfea5fa664bfaaf7c6
# Parent  020b8340e83938b1b7693bffbd445f616063ea22
CPUIDLE: Adjust Cx residency to contain Cx exit latency & overhead.

Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
---
 xen/arch/x86/acpi/cpu_idle.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff -r 020b8340e839 -r cfbe4df8d47c xen/arch/x86/acpi/cpu_idle.c
--- a/xen/arch/x86/acpi/cpu_idle.c      Wed Sep 10 11:16:26 2008 +0100
+++ b/xen/arch/x86/acpi/cpu_idle.c      Wed Sep 10 11:17:13 2008 +0100
@@ -402,8 +402,7 @@ static void acpi_processor_idle(void)
         /* Re-enable interrupts */
         local_irq_enable();
         /* Compute time (ticks) that we were actually asleep */
-        sleep_ticks =
-            ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD;
+        sleep_ticks = ticks_elapsed(t1, t2);
         break;
 
     case ACPI_STATE_C3:
@@ -471,8 +470,6 @@ static void acpi_processor_idle(void)
         lapic_timer_on();
         /* Compute time (ticks) that we were actually asleep */
         sleep_ticks = ticks_elapsed(t1, t2);
-        /* Do not account our idle-switching overhead: */
-        sleep_ticks -= cx->latency_ticks + C3_OVERHEAD;
 
         break;
 
@@ -482,7 +479,7 @@ static void acpi_processor_idle(void)
     }
 
     cx->usage++;
-    if ( (cx->type != ACPI_STATE_C1) && (sleep_ticks > 0) )
+    if ( sleep_ticks > 0 )
         cx->time += sleep_ticks;
 
     next_state = power->state;

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