diff options
| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2014-03-14 11:00:21 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-04-29 15:01:54 +0200 |
| commit | 8ad357551797b1edc184fb9f6a4f80a6fa626459 (patch) | |
| tree | 3700cdc96803f5be483cd79453b240c73b522f3a /arch/s390/kvm/trace-s390.h | |
| parent | 6852d7b69b4949234c3a8ae1f279f6a4c6563662 (diff) | |
KVM: s390: enable IBS for single running VCPUs
This patch enables the IBS facility when a single VCPU is running.
The facility is dynamically turned on/off as soon as other VCPUs
enter/leave the stopped state.
When this facility is operating, some instructions can be executed
faster for single-cpu guests.
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/trace-s390.h')
| -rw-r--r-- | arch/s390/kvm/trace-s390.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/s390/kvm/trace-s390.h b/arch/s390/kvm/trace-s390.h index 34d4f8af3a1d..647e9d6a4818 100644 --- a/arch/s390/kvm/trace-s390.h +++ b/arch/s390/kvm/trace-s390.h @@ -244,6 +244,28 @@ TRACE_EVENT(kvm_s390_enable_css, __entry->kvm) ); +/* + * Trace point for enabling and disabling interlocking-and-broadcasting + * suppression. + */ +TRACE_EVENT(kvm_s390_enable_disable_ibs, + TP_PROTO(unsigned int id, int state), + TP_ARGS(id, state), + + TP_STRUCT__entry( + __field(unsigned int, id) + __field(int, state) + ), + + TP_fast_assign( + __entry->id = id; + __entry->state = state; + ), + + TP_printk("%s ibs on cpu %d", + __entry->state ? "enabling" : "disabling", __entry->id) + ); + #endif /* _TRACE_KVMS390_H */ |