[Xen-changelog] [xen master] process softirqs while dumping domains

[patchbot@xxxxxxx]

commit 9cf71226edabd8b9bc81a5eb57823dacbe8b4bd8
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Oct 31 11:28:36 2014 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Oct 31 11:28:36 2014 +0100

    process softirqs while dumping domains
    
    Process softirqs once per domain, and once every 64 vcpus in a guest to 
avoid
    being hit by the NMI watchdog.  Discovered against a VM which had 
accidentally
    been assigned 8192 vcpus.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
---
 xen/common/keyhandler.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/xen/common/keyhandler.c b/xen/common/keyhandler.c
index 809378c..a917726 100644
--- a/xen/common/keyhandler.c
+++ b/xen/common/keyhandler.c
@@ -253,6 +253,9 @@ static void dump_domains(unsigned char key)
     for_each_domain ( d )
     {
         unsigned int i;
+
+        process_pending_softirqs();
+
         printk("General information for domain %u:\n", d->domain_id);
         cpuset_print(tmpstr, sizeof(tmpstr), d->domain_dirty_cpumask);
         printk("    refcnt=%d dying=%d pause_count=%d\n",
@@ -287,6 +290,9 @@ static void dump_domains(unsigned char key)
                d->domain_id);
         for_each_vcpu ( d, v )
         {
+            if ( !(v->vcpu_id & 0x3f) )
+                process_pending_softirqs();
+
             printk("    VCPU%d: CPU%d [has=%c] poll=%d "
                    "upcall_pend = %02x, upcall_mask = %02x ",
                    v->vcpu_id, v->processor,
@@ -311,6 +317,9 @@ static void dump_domains(unsigned char key)
     {
         for_each_vcpu ( d, v )
         {
+            if ( !(v->vcpu_id & 0x3f) )
+                process_pending_softirqs();
+
             printk("Notifying guest %d:%d (virq %d, port %d)\n",
                    d->domain_id, v->vcpu_id,
                    VIRQ_DEBUG, v->virq_to_evtchn[VIRQ_DEBUG]);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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