linux-kernel - Re: [PATCH v1 1/2] perf metrics: Fix metric matching

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Message-ID: <cf12ec88-0a15-4aa8-b6b8-948841d7d66d@linux.intel.com>
Date: Mon, 26 Feb 2024 11:00:07 -0500
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>,
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] perf metrics: Fix metric matching



On 2024-02-23 8:14 p.m., Ian Rogers wrote:
> The metric match function fails for cases like looking for "metric" in
> the string "all;foo_metric;metric" as the "metric" in "foo_metric"
> matches but isn't preceeded by a ';'. Fix this by matching the first
> list item and recursively matching on failure the next item after a
> semicolon.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

For the series,

Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>

Thanks,
Kan

> ---
>  tools/perf/util/metricgroup.c | 22 ++++++++++------------
>  1 file changed, 10 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index b24a1c177a80..2d6865c392ef 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -352,25 +352,23 @@ static int setup_metric_events(const char *pmu, struct hashmap *ids,
>  	return 0;
>  }
>  
> -static bool match_metric(const char *n, const char *list)
> +static bool match_metric(const char *metric_or_groups, const char *sought)
>  {
>  	int len;
>  	char *m;
>  
> -	if (!list)
> +	if (!sought)
>  		return false;
> -	if (!strcmp(list, "all"))
> +	if (!strcmp(sought, "all"))
>  		return true;
> -	if (!n)
> -		return !strcasecmp(list, "No_group");
> -	len = strlen(list);
> -	m = strcasestr(n, list);
> -	if (!m)
> -		return false;
> -	if ((m == n || m[-1] == ';' || m[-1] == ' ') &&
> -	    (m[len] == 0 || m[len] == ';'))
> +	if (!metric_or_groups)
> +		return !strcasecmp(sought, "No_group");
> +	len = strlen(sought);
> +	if (!strncasecmp(metric_or_groups, sought, len) &&
> +	    (metric_or_groups[len] == 0 || metric_or_groups[len] == ';'))
>  		return true;
> -	return false;
> +	m = strchr(metric_or_groups, ';');
> +	return m && match_metric(m + 1, sought);
>  }
>  
>  static bool match_pm_metric(const struct pmu_metric *pm, const char *pmu, const char *metric)