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KVM: s390: add tracepoint in gmap notifier

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The gmap notifier is called for changes in table entries with the
notifier bit set. To diagnose performance issues, it can be useful to
see what causes certain changes in the gmap.

Hence, add a tracepoint in the gmap notifier.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20231009093304.2555344-3-nrb@linux.ibm.com
Message-Id: <20231009093304.2555344-3-nrb@linux.ibm.com>
This commit is contained in:
Nico Boehr 2023-10-09 11:32:53 +02:00 committed by Janosch Frank
parent c3235e2dd6
commit 70fea30195
2 changed files with 25 additions and 0 deletions
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2
arch/s390/kvm/kvm-s390.c
View File

@ -4060,6 +4060,8 @@ static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start,
unsigned long prefix; unsigned long prefix;
unsigned long i; unsigned long i;
trace_kvm_s390_gmap_notifier(start, end, gmap_is_shadow(gmap));
if (gmap_is_shadow(gmap)) if (gmap_is_shadow(gmap))
return; return;
if (start >= 1UL << 31) if (start >= 1UL << 31)

23
arch/s390/kvm/trace-s390.h
View File

@ -333,6 +333,29 @@ TRACE_EVENT(kvm_s390_airq_suppressed,
__entry->id, __entry->isc) __entry->id, __entry->isc)
); );
/*
* Trace point for gmap notifier calls.
*/
TRACE_EVENT(kvm_s390_gmap_notifier,
TP_PROTO(unsigned long start, unsigned long end, unsigned int shadow),
TP_ARGS(start, end, shadow),
TP_STRUCT__entry(
__field(unsigned long, start)
__field(unsigned long, end)
__field(unsigned int, shadow)
),
TP_fast_assign(
__entry->start = start;
__entry->end = end;
__entry->shadow = shadow;
),
TP_printk("gmap notified (start:0x%lx end:0x%lx shadow:%d)",
__entry->start, __entry->end, __entry->shadow)
);
#endif /* _TRACE_KVMS390_H */ #endif /* _TRACE_KVMS390_H */