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Date:   Fri, 15 Jun 2018 10:21:24 +0200
From:   Jiri Olsa <jolsa@redhat.com>
To:     Thomas Richter <tmricht@linux.ibm.com>
Cc:     linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        acme@kernel.org, brueckner@linux.vnet.ibm.com,
        schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com
Subject: Re: [PATCH 3/3] perf stat: Remove duplicate event counting
Message-ID: <20180615082124.GG5082@krava>
References: <20180614114845.41221-1-tmricht@linux.ibm.com>
 <20180614114845.41221-3-tmricht@linux.ibm.com>
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On Thu, Jun 14, 2018 at 01:48:45PM +0200, Thomas Richter wrote:

SNIP

> +static void perf_pmu_assign_str(char *name, const char *field, char **old_str,
> +				char **new_str)
> +{
> +	if (!*old_str)
> +		goto set_new;
> +
> +	if (*new_str) {	/* Have new string, check with old */
> +		if (strcasecmp(*old_str, *new_str))
> +			pr_debug("alias %s differs in field '%s'\n",
> +				 name, field);
> +		zfree(old_str);
> +	} else		/* Nothing new --> keep old string */
> +		return;
> +set_new:
> +	*old_str = *new_str;
> +	*new_str = NULL;
> +}
> +
> +static void perf_pmu_update_alias(struct perf_pmu_alias *old,
> +				  struct perf_pmu_alias *newalias)
> +{
> +	perf_pmu_assign_str(old->name, "desc", &old->desc, &newalias->desc);
> +	perf_pmu_assign_str(old->name, "long_desc", &old->long_desc,
> +			    &newalias->long_desc);
> +	perf_pmu_assign_str(old->name, "topic", &old->topic, &newalias->topic);
> +	perf_pmu_assign_str(old->name, "metric_expr", &old->metric_expr,
> +			    &newalias->metric_expr);
> +	perf_pmu_assign_str(old->name, "metric_name", &old->metric_name,
> +			    &newalias->metric_name);
> +	perf_pmu_assign_str(old->name, "value", &old->str, &newalias->str);
> +	old->scale = newalias->scale;
> +	old->per_pkg = newalias->per_pkg;
> +	old->snapshot = newalias->snapshot;
> +	memcpy(old->unit, newalias->unit, sizeof(old->unit));
> +}
> +
> +/* Delete an alias entry. */
> +static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
> +{
> +	zfree(&newalias->name);
> +	zfree(&newalias->desc);
> +	zfree(&newalias->long_desc);
> +	zfree(&newalias->topic);
> +	zfree(&newalias->str);
> +	zfree(&newalias->metric_expr);
> +	zfree(&newalias->metric_name);
> +	parse_events_terms__purge(&newalias->terms);
> +	free(newalias);
> +}
> +
> +/* Merge an alias, search in alias list. If this name is already
> + * present merge both of them to combine all information.
> + */
> +static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
> +				 struct list_head *alist)
> +{
> +	struct perf_pmu_alias *a;
> +
> +	list_for_each_entry(a, alist, list) {
> +		if (!strcasecmp(newalias->name, a->name)) {
> +			perf_pmu_update_alias(a, newalias);
> +			perf_pmu_free_alias(newalias);
> +			return true;
> +		}
> +	}
> +	return false;
> +}

ok, I like your change better.. we can rebuilt it to use
rb tree later when we have this fixed

thanks,
jirka