Re: [PATCH v3] perf diff: Report noisy for cycles diff

[Jin, Yao]

On 8/12/2019 4:35 PM, Jiri Olsa wrote:
> On Sat, Aug 10, 2019 at 07:30:29AM +0800, Jin Yao wrote:
>
> SNIP
>
> > +		if (vals[i] != 0)
> > +			return 0;
> > +	return 1;
> > +}
> > +
> > +static int print_cycles_spark(char *bf, int size, unsigned long *svals, u64 n)
> > +{
> > +	int len = n, printed;
> > +
> > +	if (len <= 1)
> > +		return 0;
> > +
> > +	if (len > NUM_SPARKS)
> > +		len = NUM_SPARKS;
> > +	if (all_zero(svals, len))
> > +		return 0;
> > +
> > +	printed = print_spark(bf, size, svals, len);
> > +	printed += scnprintf(bf + printed, size - printed, " ");
> > +
> > +	if (n > NUM_SPARKS)
> > +		printed += scnprintf(bf + printed, size - printed, "..");
>
> will this '..' ever be printed? I can't see that even if I enlarge
> the column width..
>
> jirka

@@ -83,6 +85,8 @@ struct hist_entry_diff {
                /* PERF_HPP_DIFF__CYCLES */
                s64     cycles;
        };
+       struct stats    stats;
+       unsigned long   svals[NUM_SPARKS];
 };

Now we only save 8 items in svals[] (NUM_PARKS = 8). So '..' will not be 
printed. The code of printing '..' is for future possible case.

If you think it's not necessary, I would remove this.

Thanks
Jin Yao