Re: [PATCH v2] perf list: Display hybrid pmu events with cpu type

[John Garry]

On 15/12/2021 16:18, John Garry wrote:

- yao.jin@xxxxxxxxxxxxxxx, yao.jin@xxxxxxxxx

Both these author addresses bounce for me :(

And it's not just my arm64 platform which is damaged, but also my x86 
broadwell machine - uncore aliasing for perf list is broken

Before snippet:
unc_cbo_cache_lookup.any_es
[Unit: uncore_cbox L3 Lookup any request that access cache and found 
line in E or S-state]
unc_cbo_cache_lookup.any_i
[Unit: uncore_cbox L3 Lookup any request that access cache and found 
line in I-state]

After snippet:
unc_cbo_cache_lookup.any_es
[Unit: uncore_cbox L3 Lookup any request that access cache and found 
line in E or S-state]
unc_cbo_cache_lookup.any_es
[Unit: uncore_cbox L3 Lookup any request that access cache and found 
line in E or S-state]
unc_cbo_cache_lookup.any_i
[Unit: uncore_cbox L3 Lookup any request that access cache and found 
line in I-state]
unc_cbo_cache_lookup.any_i
[Unit: uncore_cbox L3 Lookup any request that access cache and found 
line in I-state]

Notice how the events are repeated (twice, for each cbox PMU) after, 
when they should not be.

This seems to be the broken code added in print_pmu_events():

> qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
> for (j = 0; j < len; j++) {
> /* Skip duplicates */
> - if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
> - continue;
> + if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name)) {
> + if (!aliases[j].pmu || !aliases[j - 1].pmu ||
> + !strcmp(aliases[j].pmu, aliases[j - 1].pmu)) {
> + continue;
> + }
> + }

Anyone an idea on the !strcmp(aliases[j].pmu, aliases[j - 1].pmu) check 
or how to fix it?

Thanks,
John