[Xen-changelog] Merge firebug.cl.cam.ac.uk:/local/scratch/kaf24/xen-2.0-testing.bk

[BitKeeper Bot <riel@xxxxxxxxxxx>]

ChangeSet 1.1360.1.18, 2005/03/25 23:02:49+00:00, kaf24@xxxxxxxxxxxxxxxxxxxx

        Merge firebug.cl.cam.ac.uk:/local/scratch/kaf24/xen-2.0-testing.bk
        into firebug.cl.cam.ac.uk:/local/scratch/kaf24/xen-unstable.bk



 time.c |   49 ++++++++++++++++++++++++++++++-------------------
 1 files changed, 30 insertions(+), 19 deletions(-)


diff -Nru a/xen/arch/x86/time.c b/xen/arch/x86/time.c
--- a/xen/arch/x86/time.c       2005-03-25 19:06:03 -05:00
+++ b/xen/arch/x86/time.c       2005-03-25 19:06:03 -05:00
@@ -1,5 +1,4 @@
-/* -*-  Mode:C; c-basic-offset:4; tab-width:4 -*-
- ****************************************************************************
+/****************************************************************************
  * (C) 2002-2003 - Rolf Neugebauer - Intel Research Cambridge
  * (C) 2002-2003 University of Cambridge
  ****************************************************************************
@@ -52,7 +51,7 @@
 static unsigned long   wc_sec, wc_usec; /* UTC time at last 'time update'.   */
 static rwlock_t        time_lock = RW_LOCK_UNLOCKED;
 
-static void timer_interrupt(int irq, void *dev_id, struct xen_regs *regs)
+void timer_interrupt(int irq, void *dev_id, struct xen_regs *regs)
 {
     write_lock_irq(&time_lock);
 
@@ -275,19 +274,13 @@
     return now; 
 }
 
-
-int update_dom_time(struct domain *d)
+static inline void __update_dom_time(struct exec_domain *ed)
 {
+    struct domain *d  = ed->domain;
     shared_info_t *si = d->shared_info;
-    unsigned long flags;
 
-    if ( d->last_propagated_timestamp == full_tsc_irq )
-        return 0;
-
-    read_lock_irqsave(&time_lock, flags);
+    spin_lock(&d->time_lock);
 
-    d->last_propagated_timestamp = full_tsc_irq;
-    
     si->time_version1++;
     wmb();
 
@@ -300,11 +293,20 @@
     wmb();
     si->time_version2++;
 
-    read_unlock_irqrestore(&time_lock, flags);
-
-    return 1;
+    spin_unlock(&d->time_lock);
 }
 
+void update_dom_time(struct exec_domain *ed)
+{
+    unsigned long flags;
+
+    if ( ed->domain->shared_info->tsc_timestamp != full_tsc_irq )
+    {
+        read_lock_irqsave(&time_lock, flags);
+        __update_dom_time(ed);
+        read_unlock_irqrestore(&time_lock, flags);
+    }
+}
 
 /* Set clock to <secs,usecs> after 00:00:00 UTC, 1 January, 1970. */
 void do_settime(unsigned long secs, unsigned long usecs, u64 system_time_base)
@@ -326,12 +328,11 @@
     wc_sec  = secs;
     wc_usec = _usecs;
 
-    write_unlock_irq(&time_lock);
-
     /* Others will pick up the change at the next tick. */
-    current->last_propagated_timestamp = 0; /* force propagation */
-    (void)update_dom_time(current);
+    __update_dom_time(current);
     send_guest_virq(current, VIRQ_TIMER);
+
+    write_unlock_irq(&time_lock);
 }
 
 
@@ -386,3 +387,13 @@
 
     setup_irq(0, &irq0);
 }
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */


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