From: Keir Fraser <keir.fraser@citrix.com>
Date: Thu, 3 Sep 2009 08:50:46 +0000 (+0100)
Subject: x86 vpt: Small performance fixes.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~13386
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success//%22http:/www.example.com/cgi/success/?a=commitdiff_plain;h=a980249c45caa086a5e08fe8a827a865c5ea9491;p=xen.git

x86 vpt: Small performance fixes.

1. once one-shot timer is fired, IRQ is raised repeatedly forever.
2. Test pending_intr_nr before pt_irq_masked(), as it is cheaper.

Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>
---

diff --git a/xen/arch/x86/hvm/vpt.c b/xen/arch/x86/hvm/vpt.c
index 0cb180ceba..7721873f2c 100644
--- a/xen/arch/x86/hvm/vpt.c
+++ b/xen/arch/x86/hvm/vpt.c
@@ -229,7 +229,7 @@ void pt_update_irq(struct vcpu *v)
 
     list_for_each_entry ( pt, head, list )
     {
-        if ( !pt_irq_masked(pt) && pt->pending_intr_nr &&
+        if ( pt->pending_intr_nr && !pt_irq_masked(pt) &&
              ((pt->last_plt_gtime + pt->period) < max_lag) )
         {
             max_lag = pt->last_plt_gtime + pt->period;
@@ -298,6 +298,7 @@ void pt_intr_post(struct vcpu *v, struct hvm_intack intack)
         if ( pt->on_list )
             list_del(&pt->list);
         pt->on_list = 0;
+        pt->pending_intr_nr = 0;
     }
     else
     {