On Sat, Nov 23, 2013 at 12:06:28AM +0900, Namhyung Kim wrote:
> 2013-11-21 (목), 12:01 +0100, Jiri Olsa:
> > Adding xen plugin.
> >
> > This plugin adds fields resolving for
> > following tracepoint events:
> > xen:xen_mc_entry
> > xen:xen_mc_extend_args
> >
> > The diff of 'perf script' output generated by old and new code:
> > (data was generated by 'perf record -e 'xen:*' ls')
> >
> > --- script.xen.old
> > +++ script.xen.new
> > - swapper 0 [002] 136.267492: xen:xen_mc_entry: [FAILED TO
> > PARSE] op=3 nargs=2 args=ARRAY[18, 00, 00, 00, 00, 00, 00, 00, 00, e0, d4,
> > 4b, 04, 88, ff, ff, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00,
> > 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00]
> > + swapper 0 [002] 136.267492: xen:xen_mc_entry: op
> > 3(stack_switch) args [18, 0, 0, 0, 0, 0]
> > - perf 1970 [008] 136.273319: xen:xen_mc_extend_args: [FAILED
> > TO PARSE] op=1 args=16 res=1
> > + perf 1970 [008] 136.273319: xen:xen_mc_extend_args:
> > extending op 1(mmu_update) by 16 bytes res ???
> >
> > NOTE We still do not handle the 'sizeof' and fail
> > to parse following xen tracepoints:
> > xen:xen_mmu_set_pte
> > xen:xen_mmu_set_pte_atomic
> > xen:xen_mmu_set_domain_pte
> > xen:xen_mmu_set_pte_at
> > xen:xen_mmu_set_pmd
> > xen:xen_mmu_set_pud
> > xen:xen_mmu_set_pgd
> > xen:xen_mmu_ptep_modify_prot_start
> > xen:xen_mmu_ptep_modify_prot_commit
> >
>
> [SNIP]
> > +static const char *xen_hypercall_name(unsigned op)
> > +{
> > + if (op < ARRAY_SIZE(xen_hypercall_names) &&
> > + xen_hypercall_names[op] != NULL)
> > + return xen_hypercall_names[op];
> > +
> > + return "";
>
> How about defaults to "unknown" if not found?
>
That's how the kernel 'xen_hypercall_name' handles it.
I dont mind, but I guess we want to change both sides.
I've already included Jeremy (kernel side author), so
I guess it's up to him ;-)
jirka
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