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[Xen-devel] [PATCH 3/3] Disable ARB_DIS conditionally
| To: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH 3/3] Disable ARB_DIS conditionally |
| From: | "Wei, Gang" <gang.wei@xxxxxxxxx> |
| Date: | Wed, 3 Sep 2008 09:55:02 +0800 |
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| Acceptlanguage: | en-US |
| Delivery-date: | Tue, 02 Sep 2008 18:55:27 -0700 |
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| Thread-index: | AckNaBRbmlf20lzgRmapdIQh+qyTZA== |
| Thread-topic: | [PATCH 3/3] Disable ARB_DIS conditionally |
CPUIDLE: Write to ARB_DISABLE conditionally to reduce some idle overheads.
Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
diff -r 48ab8d09f41e xen/arch/x86/acpi/cpu_idle.c
--- a/xen/arch/x86/acpi/cpu_idle.c Tue Sep 02 15:38:37 2008 +0800
+++ b/xen/arch/x86/acpi/cpu_idle.c Tue Sep 02 16:03:09 2008 +0800
@@ -455,8 +455,9 @@ static void acpi_processor_idle(void)
if ( power->flags.bm_check && power->flags.bm_control )
{
/* Enable bus master arbitration */
+ if ( atomic_read(&c3_cpu_count) == num_online_cpus() )
+ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
atomic_dec(&c3_cpu_count);
- acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
}
/* Re-enable interrupts */
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