bitkeeper revision 1.1159.152.5 (4188f614JwSKayrQ658vZHW3nobpSQ)

When scrubbing memory during machine boot, inform the user what we are
doing, print progress dots, and stop the NMI watchdog from mauling us.

xen/arch/x86/domain.c

@@ -699,7 +699,25 @@ int construct_dom0(struct domain *p,
     }
 
     /* Paranoia: scrub DOM0's memory allocation. */
-    memset((void *)alloc_start, 0, alloc_end - alloc_start);
+    printk("Scrubbing DOM0 RAM: ");
+    dst = (char *)alloc_start;
+    while ( dst < (char *)alloc_end )
+    {
+#define SCRUB_BYTES (100 * 1024 * 1024) /* 100MB */
+        printk(".");
+        touch_nmi_watchdog();
+        if ( ((char *)alloc_end - dst) > SCRUB_BYTES )
+        {
+            memset(dst, 0, SCRUB_BYTES);
+            dst += SCRUB_BYTES;
+        }
+        else
+        {
+            memset(dst, 0, (char *)alloc_end - dst);
+            break;
+        }
+    }
+    printk("done.\n");
 
     /* Construct a frame-allocation list for the initial domain. */
     for ( mfn = (alloc_start>>PAGE_SHIFT); 

xen/common/page_alloc.c

@@ -293,8 +293,17 @@ void scrub_heap_pages(void)
     void *p;
     unsigned long pfn, flags;
 
+    printk("Scrubbing Free RAM: ");
+
     for ( pfn = 0; pfn < (bitmap_size * 8); pfn++ )
     {
+        /* Every 100MB, print a progress dot and appease the watchdog. */
+        if ( (pfn % ((100*1024*1024)/PAGE_SIZE)) == 0 )
+        {
+            printk(".");
+            touch_nmi_watchdog();
+        }
+
         /* Quick lock-free check. */
         if ( allocated_in_map(pfn) )
             continue;
@@ -311,6 +320,8 @@ void scrub_heap_pages(void)
         
         spin_unlock_irqrestore(&heap_lock, flags);
     }
+
+    printk("done.\n");
 }
 
 

xen/include/asm-x86/apic.h

@@ -77,7 +77,8 @@ extern void init_apic_mappings (void);
 extern void smp_local_timer_interrupt (struct xen_regs * regs);
 extern void setup_APIC_clocks (void);
 extern void setup_apic_nmi_watchdog (void);
-extern inline void nmi_watchdog_tick (struct xen_regs * regs);
+extern void nmi_watchdog_tick (struct xen_regs * regs);
+extern void touch_nmi_watchdog(void);
 extern int APIC_init_uniprocessor (void);
 extern void disable_APIC_timer(void);
 extern void enable_APIC_timer(void);