On Wed, Dec 26, 2012 at 08:58:30AM -0500, Steven Rostedt wrote:
> On Tue, 2012-12-25 at 13:46 +0200, Gleb Natapov wrote:
> > kvm_mmu_zap_page even was renamed to kvm_mmu_prepare_zap_page.
> > Print out created field for kvm_mmu_get_page event.
>
> trace-cmd needs to be backward compatible with older kernels. If older
> kernels used kvm_mmu_zap_page, then please add a check for that and have
> the plugin cope with either one.
>
Something like this?
if (pevent_find_event_by_name(pevent, "kvmmmu", "kvm_mmu_prepare_zap_page"))
pevent_register_event_handler(pevent, -1, "kvmmmu",
"kvm_mmu_prepare_zap_page", kvm_mmu_print_role,
NULL);
else
pevent_register_event_handler(pevent, -1, "kvmmmu",
"kvm_mmu_zap_page", kvm_mmu_print_role, NULL);
Also when trace-cmd encounters an event it does not recognize it prints
mysterious message:
trace-cmd: No such file or directory
bad op token {
Is this a bug?
> Thanks,
>
> -- Steve
>
> >
> > Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
> > diff --git a/plugin_kvm.c b/plugin_kvm.c
> > index 55812ef..adc5694 100644
> > --- a/plugin_kvm.c
> > +++ b/plugin_kvm.c
> > @@ -382,7 +382,7 @@ static int kvm_mmu_print_role(struct trace_seq *s, struct pevent_record *record,
> > } else
> > trace_seq_printf(s, "WORD: %08x", role.word);
> >
> > - pevent_print_num_field(s, " root %u", event,
> > + pevent_print_num_field(s, " root %u ", event,
> > "root_count", record, 1);
> >
> > if (pevent_get_field_val(s, event, "unsync", record, &val, 1) < 0)
> > @@ -397,6 +397,11 @@ static int kvm_mmu_get_page_handler(struct trace_seq *s, struct pevent_record *r
> > {
> > unsigned long long val;
> >
> > + if (pevent_get_field_val(s, event, "created", record, &val, 1) < 0)
> > + return -1;
> > +
> > + trace_seq_printf(s, "%s ", val ? "new" : "existing");
> > +
> > if (pevent_get_field_val(s, event, "gfn", record, &val, 1) < 0)
> > return -1;
> >
> > @@ -430,7 +435,7 @@ int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
> > pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_unsync_page",
> > kvm_mmu_print_role, NULL);
> >
> > - pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_zap_page",
> > + pevent_register_event_handler(pevent, -1, "kvmmmu", "kvm_mmu_prepare_zap_page",
> > kvm_mmu_print_role, NULL);
> >
> > return 0;
> > --
> > Gleb.
>
--
Gleb.
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