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SubjectRe: [PATCH v2 20/40] tracing: Add simple expression support to hist triggers
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On Thu, 2017-09-07 at 12:46 -0400, Steven Rostedt wrote:
> On Tue, 5 Sep 2017 16:57:32 -0500
> Tom Zanussi <tom.zanussi@linux.intel.com> wrote:
>
> > #define DEFINE_HIST_FIELD_FN(type) \
> > static u64 hist_field_##type(struct hist_field *hist_field, \
> > void *event, \
> > @@ -148,6 +192,7 @@ enum hist_field_flags {
> > HIST_FIELD_FL_TIMESTAMP_USECS = 2048,
> > HIST_FIELD_FL_VAR = 4096,
> > HIST_FIELD_FL_VAR_ONLY = 8192,
> > + HIST_FIELD_FL_EXPR = 16384,
>
> When numbers get this big, I'm a fan of:
>
> HIST_FIELD_FL_TIMESTAMP_USECS = (1 << 11),
> HIST_FIELD_FL_VAR = (1 << 12),
> HIST_FIELD_FL_VAR_ONLY = (1 << 13),
> HIST_FIELD_FL_EXPR = (1 << 14),
>
> It makes it much easier to debug with printk()s and also know how many
> bits you are actually using.
>
> > };
> >
> > struct var_defs {
> > @@ -218,6 +263,8 @@ static const char *hist_field_name(struct hist_field *field,
> > field_name = hist_field_name(field->operands[0], ++level);
> > else if (field->flags & HIST_FIELD_FL_TIMESTAMP)
> > field_name = "$common_timestamp";
> > + else if (field->flags & HIST_FIELD_FL_EXPR)
> > + field_name = field->name;
> >
> > if (field_name == NULL)
> > field_name = "";
> > @@ -441,6 +488,115 @@ static void hist_trigger_elt_comm_init(struct tracing_map_elt *elt)
> > .elt_init = hist_trigger_elt_comm_init,
> > };
> >
> > +static const char *get_hist_field_flags(struct hist_field *hist_field)
> > +{
> > + const char *flags_str = NULL;
> > +
> > + if (hist_field->flags & HIST_FIELD_FL_HEX)
> > + flags_str = "hex";
> > + else if (hist_field->flags & HIST_FIELD_FL_SYM)
> > + flags_str = "sym";
> > + else if (hist_field->flags & HIST_FIELD_FL_SYM_OFFSET)
> > + flags_str = "sym-offset";
> > + else if (hist_field->flags & HIST_FIELD_FL_EXECNAME)
> > + flags_str = "execname";
> > + else if (hist_field->flags & HIST_FIELD_FL_SYSCALL)
> > + flags_str = "syscall";
> > + else if (hist_field->flags & HIST_FIELD_FL_LOG2)
> > + flags_str = "log2";
> > + else if (hist_field->flags & HIST_FIELD_FL_TIMESTAMP_USECS)
> > + flags_str = "usecs";
> > +
> > + return flags_str;
> > +}
>
> Also, can you make the moving of the code a separate patch before this
> patch. It makes git blame and such nicer.
>

Sure, will do as well as the above..

Tom


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