[Xen-changelog] [xen-unstable] Reduce side effects of handling '*' debug key

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

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1292414674 0
# Node ID a3a29e67aa7e75a094e1b4237b10a68cf829b542
# Parent  16673224c1cc2ca3bb9730f1d7c84fe4d96e5323
Reduce side effects of handling '*' debug key

NMI watchdog should be suppressed when dumping IRQ handlers. Softirqs
should be handled periodically while processing non-IRQ handlers.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 xen/common/keyhandler.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff -r 16673224c1cc -r a3a29e67aa7e xen/common/keyhandler.c
--- a/xen/common/keyhandler.c   Wed Dec 15 11:59:00 2010 +0000
+++ b/xen/common/keyhandler.c   Wed Dec 15 12:04:34 2010 +0000
@@ -444,16 +444,15 @@ static void run_all_nonirq_keyhandlers(u
     struct keyhandler *h;
     int k;
 
-    console_start_log_everything();
     for ( k = 0; k < ARRAY_SIZE(key_table); k++ )
     {
+        process_pending_softirqs();
         h = key_table[k];
         if ( (h == NULL) || !h->diagnostic || h->irq_callback )
             continue;
         printk("[%c: %s]\n", k, h->desc);
         (*h->u.fn)(k);
     }
-    console_end_log_everything();
 }
 
 static DECLARE_TASKLET(run_all_keyhandlers_tasklet,
@@ -464,10 +463,11 @@ static void run_all_keyhandlers(unsigned
     struct keyhandler *h;
     int k;
 
+    watchdog_disable();
+
     printk("'%c' pressed -> firing all diagnostic keyhandlers\n", key);
 
     /* Fire all the IRQ-context diangostic keyhandlers now */
-    console_start_log_everything();
     for ( k = 0; k < ARRAY_SIZE(key_table); k++ )
     {
         h = key_table[k];
@@ -476,7 +476,8 @@ static void run_all_keyhandlers(unsigned
         printk("[%c: %s]\n", k, h->desc);
         (*h->u.irq_fn)(k, regs);
     }
-    console_end_log_everything();
+
+    watchdog_enable();
 
     /* Trigger the others from a tasklet in non-IRQ context */
     tasklet_schedule(&run_all_keyhandlers_tasklet);

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