Re: [PATCH v7 1/2] perf tools c2c: Add annotation support to perf c2c report

[Li, Tianyou]

Hi Ravi,

Appreciated for your testing and the code. It works like magic. Learnt.

I compared the sample count, percentage and period by 't' in annotate 
browser, all numbers in perf c2c report aligned with perf report.

I am curious if we should update the evsel_hists->stats when 
perf_c2c__has_annotation return true. I will send out patch v8 soon.

Regards,

Tianyou

On 10/13/2025 4:52 PM, Ravi Bangoria wrote:
> On 11-Oct-25 1:46 PM, Tianyou Li wrote:
> > Perf c2c report currently specified the code address and source:line
> > information in the cacheline browser, while it is lack of annotation
> > support like perf report to directly show the disassembly code for
> > the particular symbol shared that same cacheline. This patches add
> > a key 'a' binding to the cacheline browser which reuse the annotation
> > browser to show the disassembly view for easier analysis of cacheline
> > contentions.
> I still see annotate browser title with samples/event count as 0.
> Something like below (lightly tested) should fix it. Can you please
> check?
>
>
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -299,6 +299,18 @@ static bool perf_c2c__has_annotation(struct perf_hpp_list *list)
>   	return !list || list->sym;
>   }
>   
> +static void perf_c2c__evsel_hists_inc_stats(struct evsel *evsel,
> +					    struct hist_entry *he,
> +					    struct perf_sample *sample)
> +{
> +	struct hists *evsel_hists = evsel__hists(evsel);
> +
> +	hists__inc_nr_samples(evsel_hists, he->filtered);
> +	evsel_hists->stats.total_period += sample->period;
> +	if (!he->filtered)
> +		evsel_hists->stats.total_non_filtered_period += sample->period;
> +}
> +
>   static int process_sample_event(const struct perf_tool *tool __maybe_unused,
>   				union perf_event *event,
>   				struct perf_sample *sample,
> @@ -363,6 +375,9 @@ static int process_sample_event(const struct perf_tool *tool __maybe_unused,
>   	hists__inc_nr_samples(&c2c_hists->hists, he->filtered);
>   	if (perf_c2c__has_annotation(NULL))
>   		addr_map_symbol__inc_samples(mem_info__iaddr(mi), sample, evsel);
> +
> +	perf_c2c__evsel_hists_inc_stats(evsel, he, sample);
> +
>   	ret = hist_entry__append_callchain(he, sample);
>   
>   	if (!ret) {
>
> Thanks,
> Ravi