linux-kernel - Re: [PATCH v1 1/4] perf parse-events x86: Avoid sorting uops

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Date:   Tue, 1 Aug 2023 11:40:29 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>,
        Weilin Wang <weilin.wang@...el.com>
Subject: Re: [PATCH v1 1/4] perf parse-events x86: Avoid sorting
 uops_retired.slots



On 2023-08-01 1:36 a.m., Ian Rogers wrote:
> As topdown.slots may appear as slots it may get confused with
> uops_retired.slots which is an invalid perf metric event group
> leader. Special case uops_retired.slots to avoid this confusion.
> 

Does any name with format "name.slots" cause the confusion? If so, I
don't think we can stop others from naming like the above format.

Is it better to hard code the topdown.slots/slots, rather than
uops_retired.slots?

Thanks,
Kan

> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/arch/x86/util/evlist.c | 7 ++++---
>  tools/perf/arch/x86/util/evsel.c  | 7 +++----
>  2 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c
> index cbd582182932..b1ce0c52d88d 100644
> --- a/tools/perf/arch/x86/util/evlist.c
> +++ b/tools/perf/arch/x86/util/evlist.c
> @@ -75,11 +75,12 @@ int arch_evlist__add_default_attrs(struct evlist *evlist,
>  
>  int arch_evlist__cmp(const struct evsel *lhs, const struct evsel *rhs)
>  {
> -	if (topdown_sys_has_perf_metrics() && evsel__sys_has_perf_metrics(lhs)) {
> +	if (topdown_sys_has_perf_metrics() &&
> +	    (arch_evsel__must_be_in_group(lhs) || arch_evsel__must_be_in_group(rhs))) {
>  		/* Ensure the topdown slots comes first. */
> -		if (strcasestr(lhs->name, "slots"))
> +		if (strcasestr(lhs->name, "slots") && !strcasestr(lhs->name, "uops_retired.slots"))
>  			return -1;
> -		if (strcasestr(rhs->name, "slots"))
> +		if (strcasestr(rhs->name, "slots") && !strcasestr(rhs->name, "uops_retired.slots"))
>  			return 1;
>  		/* Followed by topdown events. */
>  		if (strcasestr(lhs->name, "topdown") && !strcasestr(rhs->name, "topdown"))
> diff --git a/tools/perf/arch/x86/util/evsel.c b/tools/perf/arch/x86/util/evsel.c
> index 81d22657922a..090d0f371891 100644
> --- a/tools/perf/arch/x86/util/evsel.c
> +++ b/tools/perf/arch/x86/util/evsel.c
> @@ -40,12 +40,11 @@ bool evsel__sys_has_perf_metrics(const struct evsel *evsel)
>  
>  bool arch_evsel__must_be_in_group(const struct evsel *evsel)
>  {
> -	if (!evsel__sys_has_perf_metrics(evsel))
> +	if (!evsel__sys_has_perf_metrics(evsel) || !evsel->name ||
> +	    strcasestr(evsel->name, "uops_retired.slots"))
>  		return false;
>  
> -	return evsel->name &&
> -		(strcasestr(evsel->name, "slots") ||
> -		 strcasestr(evsel->name, "topdown"));
> +	return strcasestr(evsel->name, "topdown") || strcasestr(evsel->name, "slots");
>  }
>  
>  int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)