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?
Thanks
Namhyung
> +}
> +
> +unsigned long long process_xen_hypercall_name(struct trace_seq *s,
> + unsigned long long *args)
> +{
> + unsigned int op = args[0];
> +
> + trace_seq_printf(s, "%s", xen_hypercall_name(op));
> + return 0;
> +}
> +
> +int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
> +{
> + pevent_register_print_function(pevent,
> + process_xen_hypercall_name,
> + PEVENT_FUNC_ARG_STRING,
> + "xen_hypercall_name",
> + PEVENT_FUNC_ARG_INT,
> + PEVENT_FUNC_ARG_VOID);
> + return 0;
> +}
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